Wyniki wyszukiwania - BazTech

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Modyfikowanie własności smarnych olejów stosowanych w silniku odrzutowym oraz w układach sterowania lotem

Laber S., Laber A.

Tribologia

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2015

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nr 5

79--88

PL

W artykule przedstawiono problemy smarowania silników oraz rodzaje środków smarowych stosowanych w silnikach odrzutowych. Przedstawiono wyniki badań własności smarnych: obciążenie zespawania Pz, wskaźnik zużycia pod obciążeniem Ih, obciążenie niezacierające Pn, obciążenie zacierające Pt oraz graniczne obciążenie zużycia Goz badanych środków smarowych handlowych oraz modyfikowanych preparatem eksploatacyjnym (PE) o działaniu chemicznym Motor Life Professional. Badania wykazały, że dodanie preparatu eksploatacyjnego w ilości 5% w stosunku objętościowym wpłynęło na poprawę własności przeciwzużyciowych i przeciwzatarciowych badanych środków smarowych.

EN

The article presents the problems of lubrication and types of lubricants used in jet engines. The results of tribological properties were presented: weld point Pz, load-wear index Ih, last nonseizure load Pn, seizure load Pt, limiting load of wear Goz for commercial oils and these oils with Motor Life Professional addition. Studies have shown that the addition of additive in an amount of 5% by volume has improved antiwear and antiseizure properties investigated lubricants.

2

Interaction of jet with opposing supersonic stream in the presence of a circular flat plate

Svirschevsky S., Semenchikov N., Tarkov E.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

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2001

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nr 12

85-92

EN

Experimental results of investigations of an interaction of a single jet with an opposing supersonic flow in the presence of a circular flat plate are presented. The tests have been performed at the free stream Mach number Moo = 1.99 and the following jet parameters: the nozzle exit Mach number Mj = 4.3, relative stagnation pressure of a jet (the interaction parameter) N = 1-1389.9. The jet expansion ratio in tests varied from n < 1 to n = 34.8. The wave structures and stagnation pressure fields near jet were investigated. The reference zones and flow regimes of interaction of a jet with opposing airflow were detected. It was established, that the value of a total pressure coefficient in these zones depended on the interaction parameter N at fixed values of the Mach numbers Moo, Mj and nozzle source geometrical parameter D = DM / dj. It was shown that the drag of a circular flat plate with a jet could be increased in comparison with the drag of an isolated plate.

3

Modern military aircraft engines

Błaszczyk J., Chachurski R., Kozakiewicz A., Zalewski P.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

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2000

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nr 10

49-56

EN

Propulsion systems of modem multirole aircraft are presented in the paper focusing on concept, requirements, state of the art. The requirements, imposed by the multi-role aircraft concept on their power plant are presented and discussed. This paper also highlights the problem of number of engines, survivability, etc. The turbofan engines of primary multirole aircraft both in service and at the development stage were compared and evaluated as well. Their essential parameters which have a direct impact on the aircraft performance: such as, specific thrust, thrust to weight ratio, specific fuel consumption, bypass ratio, mass and other were assessed. The comparison both contemporary engines and their parameters can reveal the development trends in military engine technology.