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  1. 8 Journal of Achievements in Materials and Manufacturing Engineering
  2. 5 Przegląd Elektrotechniczny
  3. 3 Archives of Materials Science and Engineering
  4. 2 Computer Assisted Mechanics and Engineering Sciences
  5. 2 Computer Assisted Methods in Engineering and Science
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  1. 40 Nowak A. J.
  2. 14 Smołka J.
  3. 11 Dobrzański L. A.
  4. 7 Ostrowski Z.
  5. 5 Pusz A.
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  1. 2 2023
  2. 1 2017
  3. 3 2016
  4. 7 2015
  5. 1 2014
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1
Content available Mechanical analysis of multilayer composite materials with duroplastic matrix after exposure to low temperatures
Krzak Anna, Nowak A. J.
Archives of Materials Science and Engineering
|
2023
|
Vol. 122, nr 2
49--57
EN
Purpose: Cryogenic engineering is gaining more and more interest in various industry sectors, which leads to an intensive search for effective solutions. The article presents the findings of mechanical testing conducted on glass-epoxy laminates at room temperature and after long- term contact with liquid nitrogen. Design/methodology/approach: To compare the impact properties and flexural strength, the samples were tested under cryogenic and room conditions, and then the fracture locations were identified using the Leica DVM6 microscope. The study brings value to the emerging field of cryogenic engineering by providing valuable information on the mechanical properties of glass-epoxy composites under cryogenic conditions. Findings: It has been found out that immersing the glass-epoxy composites into the Dewar had minimal influence on impact and flexural strength properties. The most noticeable changes were observed in the case of the EP_4_2 composite. The material consists of a solution of brominated epoxy resin in an organic solvent. It is used to produce laminates in electrical engineering and printed circuits in electronics, where it should exhibit excellent impact properties. Research limitations/implications: One of the prospective research directions is a thorough analysis of the mechanical properties of the developed composite materials during cryogenic cycles. Originality/value: The study aims to determine the effect of different compositions of glass fabric-reinforced resin with a weight of 205 g/m2 on the mechanical properties of the developed composite materials at both room temperature and after long-term exposure to liquid nitrogen. Those investigations serve as surveillance for developing of new material solutions directed towards cryogenic applications and are essential for subsequent stages of research.
2
Content available Analysis of the parameters of supercapacitors containing polypyrrole and its derivatives
Gocki M., Nowak A.J., Karoń K.
Archives of Materials Science and Engineering
|
2023
|
Vol. 120, nr 1
5--14
EN
Purpose: Investigation of some parameters of energy storage devices (so-called supercapacitors) in which the structures of selected conductive polymers were implemented. Researchers were interested in the relationship between the parameters of the supercapacitor and the molecular structure of the conductive polymer used as the electrode material. Design/methodology/approach: The polypyrrole and its derivatives were produced by an electropolymerization process performed with cyclic voltammetry. During the research, polymer supercapacitors were created containing collectors made of ITO plates. Measurement of device parameters using cyclic voltammetry and chronopotentiometry. In addition, the devices use polymer electrolytes based on poly (methyl methacrylate) (PMMA). Findings: Devices containing polypyrrole have the best electrochemical parameters, while supercapacitors containing poly (phenylpyrrole) have the lowest parameters. This parameter is due to the high hindrance in the poly(phenylpyrrole) molecule in the form of an aromatic ring. Research limitations/implications: The most significant limitation of the devices is their durability due to the low strength of the conductive layer on ITO plates. This layer was easily degraded with too many test cycles. Practical implications: It was confirmed that polypyrrole and its derivatives could be used as electrode materials in energy storage devices. Originality/value: One of the few studies that allow the evaluation of the molecular structure of polypyrrole and its derivatives as electrode material in symmetrical supercapacitors.
3
Content available remote Geometrical structure investigation of the surface of internal oesophagus prosthesis
Nowak A. J., Dobrzański L. A.
Archives of Materials Science and Engineering
|
2017
|
Vol. 83, nr 2
79--85
EN
Purpose: The aim of the work was roughness investigation of the surface of developed oesophageal prosthesis before and after texturing, to estimate its influence on future application of prosthesis. Design/methodology/approach: Linear, mechanical contact-measurement method and, for verification, optical profile measurement in confocal microscope were used in the work. Findings: The roughness investigation of the surface of developed oesophageal prosthesis before and after texturing was necessary to estimate its influence on future application of prosthesis. Research limitations/implications: The results of investigations of prosthesis of the human oesophagus internal and external surface roughness will be used to design the manufacturing technology and to manufacture given prosthesis. Originality/value: Investigation of geometrical structure of internal and external surface of internal oesophageal prosthesis is the part of the research project realized by authors, that will result in cognitive, constructional and technological effects, but first of all, it will enable the real help very sick people.
4
CFD analysis of blood flow within aorta of patient with coarctation of aorta
Rojczyk M., Ostrowski Z., Adamczyk W., Melka B., Bandoła D., Gracka M., Knopek A., Golda A., Nowak A. J.
Studia Informatica
|
2016
|
Vol. 37, nr 3A
43--55
EN
Blood flow in a real geometry of aorta was analysed. The CFD analysis was performed using commercial ANSYS/Fluent code. Velocity profile was used to mimic inlet flow conditions during human cardiac cycle. Outlet pressure boundary condition was coupled with lumped parameter model (electrical analogy) of circulatory system.
PL
Przeanalizowano jednofazowy przepływ krwi dla modelu aorty odwzorowującego rzeczywistą geometrię. Symulacja CFD przeprowadzona była za pomocą komercyjnego oprogramowania ANSYS/Fluent. Na wlocie do geometrii zadano profil prędkości, odpowiadający cyklowi pracy serca. Ciśnienie krwi na wylotach określono przez sprzężenie z parametrycznym modelem skupionym (zbudowanym w analogii elektrycznej).
5
Content available The Influence of the Dispersion Method on the Microstructure and Properties of MWCNTs/AA6061 Composites
Dobrzański L. A., Macek M., Tomiczek B., Nuckowski P. M., Nowak A. J.
Archives of Metallurgy and Materials
|
2016
|
Vol. 61, iss. 2B
1229--1234
EN
The aim of this work was to study the effect of different methods of multi-walled carbon nanotubes (MWCNTs) dispersion, and their influence on the microstructure and properties of aluminium alloy matrix composites produced using the powder metallurgy techniques, such as powder milling/mixing and hot extrusion. The main problem in the manufacturing of nanocomposites is the homogeneous distribution of MWCNTs in the metal matrix. To achieve their proper distribution a high-energy and low-energy mechanical milling, using a planetary ball mill, and mixing, using a turbulent mixer, were applied. Studies have shown that composite materials prepared using milling and extrusion have a much better dispersion of the reinforcing phase, which leads to better mechanical properties of the obtained rods. The low-energy mechanical mixing and mixing using the turbulent mixer neither change the powder morphology nor lead to adequate dispersion of the carbon nanotubes, which directly affects the resulting properties.
6
Content available Influence of aging solutions on wear resistance and hardness of selected resin-based dental composites
Chladek G., Basa K., Żmudzki J., Malara P., Nowak A. J., Kasperski J.
Acta of Bioengineering and Biomechanics
|
2016
|
Vol. 18, no. 3
43--52
EN
Purpose: The purpose of this study was to investigate the effect of different plasticizing aging solutions on wear resistance and hardness of selected universal resin-based dental composites. Methods: Three light cured (one nanofilled, two microhybride) and one hybride chemical cured composites were aged at 37 °C for 48 h in distillated water, ethyl alcohol solution or Listerine mouthwash. After aging the microhardness tests were carried out and then tribological tests were performed in the presence of aging solution at 37 °C. During wear testing coefficients of friction were determined. The maximal vertical loss in micrometers was determined with profilometer. Results: Aging in all liquids resulted in a significant decrease in hardness of the test materials, with the largest values obtained successively in ethanol solution, mouthwash and water. The effect of the liquid was dependent on the particular material, but not the type of material (interpreted as the size of filler used). Introduction of mouthwash instead of water or ethanol solution resulted in a significant reduction in the coefficient of friction. The lowest wear resistance was registered after aging in ethanol and for the chemical cured hybrid composite, but the vertical loss was strongly material dependent. Conclusions: The effect of different aging solution, including commercial mouthrinse, on hardness and wear was material dependent, and cannot be deduced from their category or filler loading. There is no simple correlation between hardness of resin-based dental composites and their wear resistance, but softening of particular composites materials during aging leads to the reduction of its wear resistance.
7
Content available remote Numerical model of heat transfer in skin lesions
Ostrowski Z., Buliński P., Adamczyk W., Kozołub P., Nowak A. J.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
|
2015
|
z. 87 [291], nr 1
55--62
EN
Preliminary results of numerical modelling of skin undergoing thermal stimulation (mild cooling) in a human forearm is presented. Small brass compress was used for cooling purposes. The skin recovery process was then analysed. Temperature history for N = 14 samples was recorded using IR camera. The samples come from 8 male adults (age 25-38 years). A numerical model of heat transfer in tissues and CFD model of surrounding air (natural convection) was proposed. Simulation results were validated against experimental data.
PL
W pracy zaprezentowano wstępne wyniki modelowania numerycznego procesów wymiany ciepła w rejonie skóry przedramienia poddanej termostymulacji (łagodnego ochładzania). Do ochładzania użyto kompresów mosiężnych. Przeanalizowano proces powrotu skóry do stanu sprzed termostymulacji. Przy użyciu kamery termowizyjnej zarejestrowano rozkład temperatury dla N = 14 próbek w grupie 8 przebadanych dorosłych mężczyzn (w wieku 25-38 lat). Zaproponowano model numeryczny przepływu ciepła w tkankach przedramienia oraz w otaczającym je powietrzu (w warunkach konwekcji swobodnej). Wyniki symulacji zostały poddane walidacji przy użyciu danych pochodzących z pomiarów.
8
Content available Badania struktury geometrycznej powierzchni wewnątrzustrojowej protezy przełyku
Nowak A. J., Dobrzański L. A.
Przetwórstwo Tworzyw
|
2015
|
T. 21, Nr 4 (166)
337--342
PL
W pracy przedstawiono metodologie badań chropowatości powierzchni wewnętrznej i zewnętrznej wewnątrzustrojowej protezy przełyku wykonanej z długowłóknistego materiału kompozytowego o osnowie silikonu medycznego. W ramach rozwinięcia powierzchni zewnętrznej protezy zastosowano teksturowanie, które miało ułatwić osadzanie się ludzkich komórek i przerost tkanką własną zaiplantowanego pacjenta. Badania wykonano metodą liniowego, mechanicznego pomiaru stykowego oraz w ramach weryfikacji metodą profilometrii optycznej na mikroskopie konfokalnym. Celem pracy było zbadanie chropowatości powierzchni opracowanej protezy przełyku przed i po teksturowaniu aby ocenić jej wpływ na przyszłościowe zastosowanie protezy.
EN
The research methodology of the roughness of internal and external surface of internal oesophageal prosthesis made of long-fibre composite material with medical silicone matrix is described in the article. External surface texturing of the prosthesis was applied to facilitate human cells deposition and hypertrophy of the tissue in the body of the patient, Linear, mechanical contact-measurement method and, for verification, optical profile measurement in confocal microscope were used. The aim of the work was roughness investigation of the surface of developed oesophageal prosthesis before and after texturing, to estimate its influence on future application of prosthesis.
9
Content available remote Modelling and validation of transient heat transfer processes in human skin undergoing local cooling
Ostrowski Z., Buliński W., Adamczyk W., Nowak A. J.
Przegląd Elektrotechniczny
|
2015
|
R. 91, nr 5
76-79
EN
The analysis of transient heat transfer processes in human forearm skin undergoing local thermal stimulation (mild cooling by means of brass compress) is presented. A numerical model of heat transfer within: living tissues (Pennes bioheat equation) and metal compress used for skin cooling is proposed. Simulation results were validated against in vivo measurement data of heat flux and compress temperature for N=8 samples in four male adults (age 25–38 years).
PL
W pracy przedstawiono analizę niestacjonarnych procesów wymiany ciepła w skórze przedramienia poddanej lokalnej termostymulacji (łagodnego ochładzania przy pomocy mosiężnych kompresów). Zbudowano model numeryczny procesów przepływu ciepła w: tkankach (równanie biociepła Pennes’a) oraz kompresie używanym do chłodzenia. Otrzymane wyniki poddano walidacji na podstawie pomiarów in vivo gęstości strumienia ciepła oraz temperatury kompresu dla N=8 próbek w grupie czterech przebadanych dorosłych mężczyzn w wieku 25-38 lat.
10
Content available remote Wear abrasive resistance of intracorporeal prosthesis of oesophagus
Nowak A. J., Dobrzański L. A.
Journal of Achievements in Materials and Manufacturing Engineering
|
2015
|
Vol. 69, nr 1
26--32
EN
Purpose: The main aim of the work is investigation of abrasive wear resistance of evaluated oesophageal prosthesis internal layer, considering its long-term exploitation possibility and extreme option of food consumed by patient after implementation. Design/methodology/approach: In the work, methodology of wear abrasive investigations of oesophageal prosthesis, made of long-fibre composite material based on medical silicon, internal surface is presented. The measurements have been done on equipment designed and made in Division of Materials Processing Technology, Management and Computer Techniques in Materials Science of Institute of Engineering Materials and Biomaterials. Findings: The volume of obtained samples mass loss have been determined from approximate calculations of wear trace to simple geometrical figure mapping this loss, ant then the volume of this figure haves been calculated. The CAD software has been used to verify approximation method, which allows to precisely determine mass loss. Research limitations/implications: Developed constructional model of modern, internal prosthesis of the human oesophagus will be used to design the manufacturing technology and to manufacture given prosthesis. Originality/value: Worked out construction is the part of the research project realized by authors, that will result in cognitive, constructional and technological effects, but first of all, it will enable the real help very sick people.
11
Content available remote Validation of a numerical model of locally cooled tissues
Buliński P., Ostrowski Z., Adamczyk W., Fityka A., Nowak A. J.
Computer Assisted Methods in Engineering and Science
|
2015
|
Vol. 22, no. 4
305--314
EN
Measurements of heat transfer and temporal temperature distribution can be used as input in the diagnostic tools and methods of skin lesions, with special attention paid to malignant melanoma identification. Such approach requires mutual use of skin temperature and heat flux measurements combined with numerical simulation. A mild skin cooling process by a brass compress is considered in this paper. The temperature distribution on the skin and the heat flux between metal and tissues are measured. They are used in the course of validation study of the proposed numerical model. A numerical model of heat transfer in living tissues is described by Pennes’ bioheat equation augmented with additional models of passive thermoregulation and vasoconstriction effects. The information regarding material properties of tissues and cooling compress involved in the simulation is essential to accurately solve this problem. Therefore, the main purpose of this work is to determine the accurate material property information by means of laboratory experiments.
12
Content available remote Inverse heat transfer problems: an application to bioheat transfer
Rojczyk M., Orlande H. R. B., Colaço M. J., Szczygieł I., Nowak A. J., Białecki R. A., Ostrowski Z.
Computer Assisted Methods in Engineering and Science
|
2015
|
Vol. 22, no. 4
365--383
EN
In this work, we applied the Markov chain Monte Carlo (MCMC) method for the estimation of parameters appearing in the Pennes’ formulation of the bioheat transfer equation. The inverse problem of parameter estimation was solved with the simulated transient temperature measurements. A one-dimensional (1D) test case was used to explore the capabilities of using the MCMC method in bioheat transfer problems, specifically for the detection of skin tumors by using surface temperature measurements. The analysis of the sensitivity coefficients was performed in order to examine linear dependence and low sensitivity of the model parameters. The solution of the direct problem was verified with a commercial code. The results obtained in this work show the ability of using inverse heat transfer analysis for the detection of skin tumors.
13
Content available Numerical modeling and preliminary validation of drag-based vertical axis wind turbine
Krysiński T., Buliński Z., Nowak A. J.
Archives of Thermodynamics
|
2015
|
Vol. 36, no. 1
19--38
EN
The main purpose of this article is to verify and validate the mathematical description of the airflow around a wind turbine with vertical axis of rotation, which could be considered as representative for this type of devices. Mathematical modeling of the airflow around wind turbines in particular those with the vertical axis is a problematic matter due to the complex nature of this highly swirled flow. Moreover, it is turbulent flow accompanied by a rotation of the rotor and the dynamic boundary layer separation. In such conditions, the key aspects of the mathematical model are accurate turbulence description, definition of circular motion as well as accompanying effects like centrifugal force or the Coriolis force and parameters of spatial and temporal discretization. The paper presents the impact of the different simulation parameters on the obtained results of the wind turbine simulation. Analysed models have been validated against experimental data published in the literature.
14
Content available remote Infant care bed natural convection heat transfer coefficient – measurements and estimation
Ostrowski Z., Rojczyk M., Łaszczyk J., Szczygieł I., Kaczmarczyk J., Nowak A. J.
Przegląd Elektrotechniczny
|
2014
|
R. 90, nr 5
122--125
EN
The energy balance and heat exchange for newborn baby in infant care bed environment (radiant warmer) are considered. Convective and radiant heat losses from an infant in radiant warmer were studied using copper cast anthropomorphic thermal manikin and controlled climate chamber setup. The total body heat loss was measured for several mean skin and ambient temperatures, leading to total heat transfer coefficient estimation.
PL
Rozważany jest bilans energii oraz mechanizmy wymiany ciepła dla noworodka w otwartym inkubatorze dla niemowląt. Wykorzystano miedziany antropomorficzny manekin termiczny noworodka do zbadania konwekcyjnej i radiacyjnej wymiany ciepła z otoczeniem w komorze klimatycznej. Zmierzono całkowity strumień traconego ciepła dla wybranych średnich temperatur skóry oraz otaczającego powietrza, a następnie wyznaczono konwekcyjny współczynnik wnikania ciepła.
15
Content available remote Zastosowanie metody elementów skończonych do modelowania wewnątrzustrojowej protezy przełyku
Nowak A. J., Dobrzański L. A., Rybczyński R., Mech R.
Przetwórstwo Tworzyw
|
2013
|
[R.] 19, nr 4 (154)
384--389
PL
W pracy przedstawiono symulację komputerową wewnątrzustrojowej protezy przełyku, wykonanej z długowłóknistego materiału kompozytowego, z wykorzystaniem Metody Elementów Skończonych (MES). Modelowanie naprężeń wewnętrznych protezy wykonano w środowisku ANSYS Workbench. Dodatkowo w pracy przedstawiono zalety stosowania tego typu oprogramowania. Zastosowana MES pozwoliła na modelowanie naprężeń i odkształceń powstających w materiale kompozytowym, zarówno w warunkach odwzorowujących rzeczywiste badania doświadczalne, jak i w warunkach przybliżonych do panujących w organizmie człowieka po zaimplantowaniu protezy. Opracowana symulacja upraszcza oraz zmniejsza koszty optymalizacji własności wewnątrzustrojowej protezy przełyku przez symulację tych własności bez konieczności wykonywania dodatkowych badań laboratoryjnych.
EN
The general topic of this paper is the computer simulation with the use of Finite Element Method (FEM) for determining the internal stresses in the internal oesophageal prosthesis based on long-fibre composite material. Modelling of stresses in the internal oesophageal prosthesis was performed with the help of FEM in ANSYS environment. Application of FEM was discussed and essential advantages resulting from application of it are pointed. Applied FEM enables modelling of stresses and deformations arises in composite material in the conditions representing real experimental investigations as well as condition similar of those prevailing in human body after prosthesis implementation. Developed simulation simplifies and reduces cost of optimization of the internal oesophageal prosthesis properties by simulation of this properties without necessity of additional laboratory investigations.
16
Optymalizacja konstrukcji laboratoryjnej suszarki o naturalnym obiegu powietrza za pomocą zweryfikowanej eksperymentalnie analizy CFD
Smołka J., Buliński Z., Nowak A. J.
Przegląd Mechaniczny
|
2013
|
nr 7-8
24--34
PL
W artykule opisano model numerycznej mechaniki płynów oraz zaprezentowano badania eksperymentalne procesów cieplno-przepływowych w cieplarce o naturalnym obiegu powietrza. Analizowane urządzenie służy do przechowywania próbek laboratoryjnych i produktów w wysokiej, stałej i przestrzennie wyrównanej temperaturze. W celu określenia danych do sformułowanego modelu matematycznego, wykonano szereg pomiarów prowadzących do wyznaczenia warunków brzegowych na powierzchni grzałek oraz emisyjności wewnętrznych i zewnętrznych powierzchni obudowy koniecznych do określenia radiacyjnych strumienia ciepła. Ponadto do walidacji modelu wykonano pomiary przestrzennego pola temperatury i prędkości za pomocą zestawu termopar i techniki Particie Image Velocimetry. Na podstawie wyników uzyskanych z modelu, zaproponowano i opracowano procedurę optymalizacyjną położenia grzałek i otworów nawiewnych w komorze urządzenia. Zoptymalizowane elementy pozwoliły na uzyskanie znacznie poprawionych równomierności pola temperatury w komorze przechowywania urządzania.
EN
This paper discusses a 3-D Computational Fluid Dynamics (CFD) model and presents experimental analysis of the flow and thermal processes within a laboratory heating oven with a natural air circulation. This device is used to store laboratory samples and products at a high, constant and spatially uniform temperature. To formulate the mathematical model, a number of experiments were carried out to determine the temperature boundary conditions along the U-shaped heaters and the emissivity of the internal and external walls to determine the radiative heat fluxes. In addition, to validate the spatial temperature and velocity fields in the storage chamber and on the external oven walls, a set of thermocouples and Particie Image Velocimetry (PIV) were employed. Based on the results of the model, two optimisation procedures are performed to position optimally the electric heater and air distribution gaps using simplified geometries of the device. The optimised solutions show a substantial improvement in the uniformity of the temperature field in the storage chamber.
17
Content available remote Analiza numeryczna procesu wymiany ciepła wewnątrz rozdzielnicy elektrycznej
Będkowski M., Smołka J., Nowak A. J.
Przegląd Elektrotechniczny
|
2013
|
R. 89, nr 2b
284--287
PL
Celem artykułu było opracowanie przestrzennego modelu numerycznego opisującego proces przepływu ciepła i masy wewnątrz rozdzielnicy elektrycznej. Ponadto w wyniku jego sprzężenia z modelem elektromagnetycznym w przeprowadzonej analizie uwzględniono wpływ efektu zbliżenia oraz naskórkowości na proces generacji ciepła w szynach urządzenia. Analiza numeryczna została przygotowana dla rzeczywistej rozdzielnicy elektrycznej.
EN
The main aim of this work was to develop a 3-D numerical model, which describes the heat and mass transfer (CFD) problem inside switchgear casing. In addition, as a result of CFD and electromagnetic model coupling, the induced effects, i.e. proximity and skin effects on heat generation in the device busbars were taken into consideration. The analysis was performed for the existing switchgear device.
18
Content available Wastewater treatment in constructed wetlands
Nowak A. J., Królik D., Kostecki J.
Civil and Environmental Engineering Reports
|
2013
|
No. 11
93--99
EN
Constructed wetlands are an alternative and economically reasonable way for the wastewater from dispersed development treatment. Existing systems showed that the effectiveness of this treatment is high. The whole treatment process depends on many factors such as time of operation, type of filling, temperature. Constructed wetlands with proper construction and operation are safe for the environment and users.
PL
Oczyszczalnie hydrofitowe są alternatywnym i ekonomicznie uzasadnionym, sposobem na oczyszczanie ścieków pochodzących z zabudowań charakterze rozproszonym. Literatura oraz badania istniejących systemów ze złożem gruntowo roślinnym pokazują, że skuteczność oczyszczania ścieków jest wysoka. Na skuteczność wpływa wiele czynników tj. czasu eksploatacji, rodzaju wypełnienia złoża, temperatury. Hydrofitowe oczyszczalnie ścieków przy odpowiedniej budowie i eksploatacji są bezpieczne dla środowiska oraz użytkowników.
19
Content available remote Analiza numeryczna procesu wymiany ciepła wewnątrz rozdzielnicy elektrycznej
Będkowski M., Smołka J., Nowak A. J.
Zeszyty Naukowe. Elektryka / Politechnika Łódzka
|
2012
|
z. 124
9-14
PL
Celem wykonanej analizy numerycznej było przygotowanie modelu numerycznego opisującego proces generacji ciepła wewnątrz rozdzielnicy elektrycznej. W przeprowadzonej sprzężonej analizie przepfywowo-elektromagnetycznej uwzględniono wpływ efektu zbliżenia oraz naskórkowości na proces generacji ciepła. Analiza numeryczna została przygotowana dla rzeczywistej rozdzielnicy elektrycznej.
EN
The main aim of this work is to present the numerical model, which describes the heat transfer problem inside switchgear casing. The induced effects, i.e. proximity and skin effects lead to a nonuniform current distribution in conductors and additional losses. Therefore, to increase the accuracy of obtained results the one way coupling between electromagnetic and CFD solvers was introduced to the model. The analysis was performed for existing industrial switchgear device.
20
Content available remote Modyfikacja konfiguracji cewek suchego transformatora elektrycznego w celu obniżenia temperatury najgorętszego miejsca
Smołka J., Nowak A. J.
Przegląd Elektrotechniczny
|
2011
|
R. 87, nr 7
60-63
PL
W artykule przedstawiono optymalizację wzajemnego położenia cewek GN i DN oraz kanałów chłodzących te elementy dla suchego transformatora. W przeprowadzonych obliczeniach minimalizowano temperaturę najgorętszego miejsca uzwojenia, którą wyznaczano za pomocą zweryfikowanego eksperymentalnie modelu numerycznego CFD. Wyniki badań pokazały, że najkorzystniejsze rozwiązanie, znacząco obniżające temperatury cewek, różni się od dotychczas stosowanych konfiguracji w tego typu jednostkach.
EN
In this work, an optimisation of mutual configuration of both HV and LV coils, and also air ducts cooling these parts in dry-type electrical transformer is presented. In the proposed algorithm, the hot-spot temperature is minimized using experimentally validated CFD model. The obtained results show that the optimized solution substantially reduces the maximum winding temperature comparing to a typical configuration of the actual devices.
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