PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników
Powiadomienia systemowe
  • Sesja wygasła!

Znaleziono wyników: 11

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  centrifugal
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Characteristics of stress distribution of a multi layered cylindrical pressure vessel
Somadder Somnath, Das Palash, Islam Md. Ashraful
Journal of Mechanical and Energy Engineering
|
2022
|
Vol. 6, No 2
1--6
EN
The operation of a multilayer pressure vessel subjected to thermomechanical loads is very significant. The cylindrical pressure vessel is widely used in industrial engineering: for example, to hold a variety of different types of liquid. On thick-walled cylinders, various loading circumstances such as internal overpressure, external overpressure, heat, bending, twisting, and combinations of these load characteristics are applied. Researchers have developed a number of strategies for enhancing the strength of cylinders, including the use of multilayer cylinders and increasing the thickness of the walls. This paper presents the results of an analytical and numerical analysis of a three-layer cylinder. The Abaqus FEA software is used to determine temperature, displacement, and stress distribution of a multilayer cylinder considering the effect of centripetal and centrifugal heat flow. From the numerical analysis, it is observed that centrifugal heat flux is more hazardous than centripetal heat flux for a multi-layered cylinder under thermo-mechanical loading.
2
Content available Overview of the centrifugal methods of provision the grinding fluid to the grinding zone
Kieraś S., Nadolny K.
Journal of Mechanical and Energy Engineering
|
2017
|
Vol. 1, No 1
7--14
EN
This article presents five methods of centrifugal provision the grinding fluid to the grinding zone such as centrifugal grinding fluid supplying through the grinding spindle and through the grinding wheel, centrifugal grinding fluid provision through the channels in the grinding wheel body and grinding wheel pores, centrifugal grinding fluid provision through the channels in the body and space between abrasive segments, centrifugal grinding fluid provision through the grinding wheel divider radial channels, centrifugal grinding fluid supply method with use of zonal centrifugal grinding fluid provision system. The described characteristics were referred primarily to the conventional flood cooling method as a reference. In summary the conclusions drawn after mentioned characteristics analysis were presented.
3
Content available Numerical study of surge predecessors in centrifugal blower — inlet recirculation
Chmielecki J., Liśkiewicz G., Kryłłowicz  W.
Transactions of the Institute of Fluid-Flow Machinery
|
2016
|
nr 134
29--44
EN
Paper presents the numerical investigation of inlet recirculation in a centrifugal blower. This phenomenon is known as a local flow instability that is not too harmful in centrifugal compressors compared to centrifugal pumps. However recent findings have shown that it can be regarded as a surge predecessor, and hence very significant for compressors. Therefore there is strong need to understand its physics. One of ways to understand it to apply computational fluid dynamic (CFD) simulations. Therefore in this study the transient numerical simulations were conducted and results were related to the experimental data presented in other papers. Simulation confirmed that the inlet recirculation structure can be resolved by means of CFD and the results are in agreement with some available models. Inlet recirculation structure built up gradually along the circumference increasing the power loss. Obtained structure also explained pressure variations observed in experiments. This has shown that CFD can bring significant improvement in existing antisurge systems and recirculation bleeds that extend the machine operating range.
4
Content available Reverse engineering of centrifugal compressor flow map
Czarnecki M.
Journal of KONES
|
2014
|
Vol. 21, No. 4
57--62
EN
The modern design process is based on multi-criteria optimization methods. They require at the initial stage collecting a maximum amount of reliable information. In the case of centrifugal compressor would be desirable to obtain specified performance maps in the form of a digital array. High-resolution arrays are suitable to interpolate values between their nodes. Access to digital resources is often limited, because they are an intellectual property of the certain companies. As a temporary replacement is possible, the use of the characteristics published as illustrative or design characteristics published from solutions of the previous generations. Presented article takes the issue of adapting simplified compressor characteristics to the requirements of PMDO (preliminary multidisciplinary optimization) process. Selected characteristics due to the low density of the contour lines on the map field was not suitable for direct conversion into digital form Presented map was reconstructed by the method of approximation using a polynomials of nth degree. Reverse engineered map generates correct values at compressor contour map nodes. Chosen method is characterized by low demands in terms of computational power requirements, which makes it suitable to use also in embedded microprocessor control systems. Main advantage of presented method is allowed to create a working replacement of digital map that can be used until time when inputs will be complemented by experimental data.
5
Content available The mathematical model of material particle motion
Batluk V., Sukach R.
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
|
2014
|
Vol. 3, No 2
3--6
EN
This article is concerned with the problem of high-performance dust-catching equipment creation for various industries, where: fine-dyspersated dust fractions are emitted, in order to make their emissions conform to sanitary norms. This article elucidates new tendencies in the area of the creation of equipment for air from dust cleansing, which are based on the use of centrifugal inertia forces.
6
Content available The problem of highly effective cleaning of air from dust
Batluk V. A., Romantsov E.V., Klymets’ V. M.
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
|
2013
|
Vol. 2, No 2
17--25
EN
This article deals with the problem of providing high performance apparatuses for cleaning air from dust in various branches of industry in order to reduce hazardous emissions to the level of conforming to the sanitary-hygienic norms. The article describes new trends in the development of dust catching apparatuses based on the use of centrifugal-inertial forces, permitting to improve significantly the dust catching efficacy.
7
Content available Mathematical model of dust cleaning process in centrifugal-inertial dust collector
Batluk V., Paranyak N., Makarchuk V
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
|
2013
|
Vol. 2, No 2
9--16
EN
The article is devoted to the problem of providing air cleaning from dust in various industries, using highly efficient apparatus, with the aim of bringing the volume of harmful emissions to the sanitary standards. The article presents new directions in creating of dust cleaning apparatus, based on the usage of centrifugal, inertial forces, by which the efficiency of dust collection could be significantly increased.
8
Content available Mathematical model for motion of weighted parts in curled flow
Batluk V., Basov M., Klymets’ V.
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
|
2013
|
Vol. 2, No 3
17-24
EN
The article deals with the problem of providing high performance apparatuses for cleaning air from dust in various branches of industry in order to reduce hazardous emissions to the level conforming to sanitaryhygienic norms. The article describes new trends in the development of dust catching apparatuses based on the use of centrifugal-inertial forces, permitting to improve significantly the effectiveness of dust catching.
9
Content available Badania filtracji ciśnieniowej i wirowej zawiesiny flotokoncentratu węglowego po dodaniu flokulantu i jego sonifikacji
Palica M., Obrochta N., Rozmus B., Tlałka A.
Inżynieria i Aparatura Chemiczna
|
2012
|
Nr 1
4-7
PL
Testom filtracji ciśnieniowej w zakresie AP = 0,09+1,5 MPa oraz filtracji wirowej w zakresie a/g = 112&divite;1787 i x = 4&divite;30 min poddano przemysłową zawiesinę flotokoncentratu, zawiesinę z dodatkiem flokulantu 70+170 g/l Mg s. p. oraz z flokulantem sonifikowanym. Wykazano, że filtracja wirowa flotokoncentratu z dodatkiem 110 g flok./l Mg s. p. pozwala uzyskać przy dostatecznie wysokich a/g i i znacząco niższe wpl w porównaniu z wpl po filtracji próżniowej i ciśnieniowej.
EN
Industrial suspension of flotoconcentrate, suspension with the addition of 70÷l 70 g/l Mg s. p. of flocculant and suspension with sonicated flocculant underwent pressure filtration tests in the range AP = 0.09+1.5 MPa and centrifugal filtration tests in the ranges.a/g = 112÷1787 and x = 4÷30 min. It was proved that centrifugal filtration of flotoconcentrate with the addition of 110 g/1 Mg s. p. of flocculant allowed one to obtain significantly lower wp, (at appropriate high a/g and i τ in comparison with wpl obtained after vacuum and pressure filtration.
10
Content available The problem of highly effective cleaning
Batluk V., Romanzov E., Paranyak N.
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
|
2012
|
Vol. 1, No 1
9-12
EN
The article deals with the problem of providing high performance apparatuses for cleaning air from dust in various branches of industry in order to reduce hazardous emissions to the level conforming to sanitary-hygienic norms. The article describes new trends in the development of dust catching apparatuses based on the use of centrifugal-inertial forces, permitting to significantly improve the effectiveness of dust catching.
11
Badania odwadniania osadów pokoagulacyjnych w procesie sedymentacji odśrodkowej
Juraszka B., Piecuch T.
Ekologia i Technika
|
2008
|
R. 16, nr 3
97-105
PL
W ramach tej publikacji przedstawiono wyniki badań laboratoryjnych, których celem było ustalenie wpływu czasu i prędkości wirowania, rodzaju i dawki flokulanta oraz wartości wskaźników osadów nadawanych do procesu, na parametry osadu po procesie sedymentacji odśrodkowej. Podczas badań zastosowano flokulant PRAESTOL średnio anionowy - 2440 i słabo kationowy - 610BC, o dawce od O do 5 g/kg s.m.o. i wirówkę laboratoryjną MPW - 350. W pracy przedstawiono zarówno metodykę badań i charakterystykę osadów i flokulantów użytych do badań. Uzyskano wyniki, które dla ustalonej prędkości obrotowej tj. n = 2000 min-1 pozwoliły na określenie uwodnienia po 5 minutach wirowania (uwodnienie 80,3% przy braku wspomagania przy pomocy flokulanta). Przy większych prędkościach wirowania nie uzyskano skuteczniejszego odwadniania. Badania wpływu dawki flokulanta anionowego przy tych samych parametrach co poprzednio (n = 2000 min-1 i t = 5 min) wykazało, że im większa jego dawka, tym niższe uwodnienie osadu, aż do 63,8%. Badania objęły również wpływ uwodnienia osadów nadanych do procesu wirowania na ich uwodnienie po sedymentacji i wykazały liniowy charakter tej obniżki oraz zależność zmian od dawki zastosowanego flokulanta. Przebadano również wpływ flokulanta kationowego na uwodnienie osadów, uzyskując zbliżone rezultaty i potwierdzenie, że skuteczniejszym flokulantem okazał się średnio anionowy. Na podstawie uzyskanych wyników badań wyznaczono, stosując metodę punktu centralnego, równania analityczno-empiryczne opisujące wpływ poszczególnych parametrów niezależnych na wartości parametrów wynikowych. W celu weryfikacji otrzymanych równań matematycznych analityczno-empirycznych wykonano dodatkowo kilka losowych doświadczeń przy dowolnie wybranych wartościach poszczególnych zmiennych xr x2 x3 mieszczących się w badanych poprzednio przedziałach zmian, celowo dobranych w taki sposób, aby nie kojarzyły się te wartości z punktem centralnym aproksymacji, lecz tylko z przestrzenią wokół tego punktu - a więc przestrzenią, w której przyjmuje się, iż otrzymane równania można stosować.
EN
The paper presents results of laboratory research on determination of influence of time and rotation speed, type and dose of flocculants as well as parameters of sediments before the process, on parameters of sediments after the process. During research following types of flocculants were used: PRAESTOL moderately anionic - 2440 and weak cationic - 610BC. Dose range was from O to 5 g/kg s.d.m (sediment dry mass). Process was conducted in laboratory centrifuge MPW - 350. The paper presents both methodology of research, characteristics of sediments as well as flocculants used during research. 80,3% of water content in sediments after the process of centrifugal sedimentation was gained under following conditions: no flocculant addend, rotation speed n = 2000 min-1, rotation time 5 minutes. Higher speeds did not improve this level. Research on anionic flocculent dose influence, under the same conditions (n = 2000 min-1 and t = 5 min) showed that the higher dose the lower water content in sediments, up to 63,8%. Research on influence of water content in sediments before the process on water content after the process showed their linear characteristics and the dependence of changes on dose of used flocculent. The influence of cationic flocculent on water content in sediments was also tested. Similar results were gained as well as confirmation that moderately anionic was more efficient flocculent. On the base of gained results several analytical-empirical equations were determined, using method of central point. Those equations describe influence of individual independent parameters on values of resulting parameters. In order to verify those equations several tests were conducted with random values of individual variables x,, X2, x3 within the range of tested previously range. Those values were also not close to the value of central point, but in the space around it, that is in the space where equations may be used.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.