Wyniki wyszukiwania - BazTech

1

Preliminary design of the last stage of supercritical steam turbine and proposition of anti-erosion coating for blades surface

Grzymkowska A., Głuch S., Zykova A., Safonov V.

Przegląd Mechaniczny

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2017

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nr 9

19--21

EN

In this article a preliminary design of the last stage of supercritical steam turbine has been presented. A computational model of supercritical thermal cycle has been created in order to determine steam parameters at the stage inlet and outlet. The model was based on the structure of German coal-fired power plant Datteln 4. Further steam-flow parameters and dimensions of stator and rotor blades have been calculated analytically. Stage geometry has been created and steam flow through designed stage upper-part has been simulated. Operating conditions of steam turbine last stages have been discussed and protective anti-erosion coating of blades surfaces have been proposed.

PL

W niniejszym artykule przedstawiono wstępny projekt ostatniego stopnia turbiny parowej na parametry nadkrytyczne. W celu określenia parametrów pary na wlocie oraz wylocie z analizowanego stopnia, utworzono obliczeniowy model obiegu cieplnego siłowni na parametry nadkrytyczne, wzorując się na strukturze niemieckiej elektrowni węglowej Datteln 4. Pozostałe parametry przepływu pary oraz wymiary łopatek kierowniczej i wirnikowej wyznaczono analitycznie. Utworzono geometrię projektowanego stopnia oraz przeprowadzono symulację przepływu pary przez górny fragment kanału przepływowego. Omówiono warunki pracy ostatnich stopni turbin parowych oraz zaproponowano antyerozyjną powłokę ochronną dla powierzchni łopatek.

2

The parametric method of evaluation of technical condition of the working turbomachine blade depending on the distribution course representing its environment

Grądzki R.

Journal of Polish CIMAC

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2011

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Vol. 6, no 2

91-102

EN

This article presents tests results of monitoring technical condition of turbomachine blades. The method is based on a diagnostic model fi T12,T01 that utilizes the difference of phase shift of signals that are the result of blade operation y(t) and a signal x(t) of its environment described with appropriate distribution when the blade moves away from the sensor and when the blade tip approaches the sensor. The adopted diagnostic model indirectly takes into account present blade environment x(t) without the need to measure it [13,15]. The results of diagnosing three blades (worn out to a great extent, considerably worn out and worn out to a little extent) with the use of different distribution courses were presented. Shown results differ to a little extent from each other. However, they unequivocally specify the character of blade wear. Thus, the choice of distribution that represents non-measurable blade environment while determining parameters of a model fi T12,T01 for evaluation of technical condition of working turbomachine is optional and limited only by observation time.

3

Vibration of turbomachine blading with damages

Vorobiov I., Rządkowski R., Chugay M., Romanenko V.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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2008

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nr 133

351--358

EN

The work presents analysis of vibrations of turbomachine blading with damages. 3D models and finite elements method are used. The influence of the different depth and locations of cracks on the natural frequencies, displacement forms and stress intensity is analyzed. The real turbomachine blading with damages is considerated. The validity of results obtained has been done by comparison with experimental data. The received results can be used at research of vibration stress localizations of turbomachine blading with damages.

4

History and future of turbine aircraft engines

Opara T.

Silniki Spalinowe

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2007

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R. 46, nr SC1

10-26

EN

This paper discusses stages of development of air propulsion from piston engines up to three-rotor turbine ones. Limitations in speed and altitude of flight, caused by traditional system of a piston engine and an airscrew, became an impulse to conduct research on jet propulsion. Accomplishments of the designers of the first jet-propelled engines: F. Whitle and H. von Ohain are a reflection of rivalry in this field. In the second half of the 20th century turbine propulsion (turbojet, turboprop and helicopter engines) dominated air force and civil aviation. In 1960 the age of turbofans began, owing to better operating properties and electronic and digital systems of automatic regulation. Further development of turbine engines is connected with application of qualitatively new materials (particularly composites), optimization of the shape of compressor and turbine blades and technologies of their production. The paper discusses design changes decreasing the destructive effects of foreign matter suction and indicates the possibility of increasing the maneuverability of airplanes by thrust vectoring. Finally, development prospects of turbine propulsion are analyzed.

5

Droga od cieplnych maszyn objętościowych do przepływowych, do ich symbiozy i dalej... ,

Gundlach W., Olczyk A.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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2002

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nr 121

35--53

PL

Szkic rozwoju cieplnych maszyn energetycznych i ich obiegów termodynamicznych począwszy od współzawodnictwa maszyn objętościowych ze spalaniem zewnętrznym: powietrznych (Stirling, Ericson) i parowych (Sankey, Watt), poprzez maszyny objętościowe ze spalaniem wewnętrznym (Otto, Diesel), do początków ich symbiozy z maszynami przepływowymi wirnikowymi (1905r) i pojawienia się wreszcie sprawnej turbiny spalinowej (1939r), otwierającej następnie drogę układom i procesom gazowoparowym kombinowanym ze wspaniale równolegle rozwijającymi się i zbliżającymi do granic swych możliwości turbinami parowymi, aż do w pełni skojarzonej, optymizowanej, sieciowej i rozproszonej produkcji i gospodarki potrzebnymi postaciami energii stanowiących wyzwania XXI wieku.

EN

An overview of the development in the field of heat fluid-flow machines and their thermodynamic cycles is provided. It starts with a presentation of the competition between volumetric machines with external combustion: air (Stirling, Ericson) and steam (Sankey, Watt) cycles, goes through volumetric machines with internal combustion (Otto, Diesel) to the beginnings of their symbiosis with turbomachines (1905) and an introduction of the sufficiently efficient gas turbine (1939), which then gave rise to combined steam and gas systems and processes, and which was simultaneously accompanied by a great progress in steam turbines approaching their upper performance limits, and finally led to fully coupled, optimized power and energy generation and distribution systems of all energy forms needed, both within the frames of huge networks and small, customized power plants that are considered to be challenges of the 21st century.

6

Diagnostyka wibroakustyczna i metoda oceny uszkodzeń wirujących elementów maszyn turbinowych

Bouraou N., Marchuk P., Tyapchenko A.

Vibrations in Physical Systems

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2000

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Vol. 19

66--67

7

Turbomachinery dynamic properties of the rotor magnetic suspension system

Kozanecka D.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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1999

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nr 115

217--224

EN

An application of magnetic bearings as a system of the shaft suspension provides supplementary diagnostic capabilities unparalleled in classic solutions. Their application in real turbomachines requires experimental verification of dynamic parameters. In this paper an idea and experimental results aimed at determination of dynamic stiffness and damping of the system are discussed.