Pulsations Induced by Vibrations in Aircraft Engine Two-Stage Pump

[摘要] This paper describes a phenomenon of induced pressure pulsations inside a two-stage aircraft engine pump. A considered pumps consists of a screw-centrifugal and gear stages. The paper describes the cause of two-stage pump elements loading. A number of hypothesis of pressure pulsations generation inside a pump were considered. The main focus in this consideration is made on phenomena that are not related to pump mode of operation. Provided analysis has shown that pump vibrations as well as pump elements self-oscillations are the main causes that lead to trailing vortices generation. Analysis was conducted by means FEM and CFD simulations as well by means of experimental investigations to obtain natural frequencies and flow structure inside a screw-centrifugal stage. To perform accurate simulations adequate boundary conditions were considered. Cavitation and turbulence phenomena have been also taken into account. Obtained results have shown generated trailing vortices lead to high-frequency loading of the impeller of screw-centrifugal stage and can be a cause of the bearing damage.

[发布机构] Department of Automatic Systems of Power Plants, Samara National Research University, Moskovskoe Shosse 34, Samara; 443086, Russia^1;Lappeenranta University of Technology, Skinnarilankatu 34, Lappeenranta; 53850, Finland^2

[效力级别] 无线电电子学 [学科分类] 航空航天科学

[关键词] CFD simulations;Experimental investigations;High frequency HF;Mode of operations;Pressure pulsation;Pump vibrations;Self-oscillations;Trailing vortex