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Date of Publication:2022-10-06

Journal:哈尔滨工程大学学报

Volume:39

Issue:6

Page Number:1006-1011

ISSN No.:1006-7043

Abstract:In order to compensate the wake effect casing by guide vane,the air injection through two channels is ap-plied to the trailing edge. The trailing edge blowing reduces the impact of rotor-stator interaction and further de-creases the aerodynamic load on the following impeller. Thus,it improves the safty of the impeller. Based on nu-merical simulations,this article studies on the effect of the trailing edge blowing structure in a centrifugal compres-sor with variable inlet guide vane. The study analyzes the flow field and aerodynamic load under different guide vane angle during the centrifugal compressor operation. The simulation results show that the trailing edge blowing has a little influence on compressor performance. Under different blowing flows,the flow field shows different wake styles,which include pure wake,weak wake,momentumless wake and jet. When the blowing set 2% of the total flow under 0 degree guide vane angle,the momentumless wake appears,and the aerodynamic load on impellers has been reduced significantly,especially at the middle span of the impellers. With the increasing of the guide vane an-gle,the wake distribution after the guide vane appears significant difference as the development of wall separation flow. It needs more blowing flow to reach the momentumless wake style,however,the effect has decreased. When the guide vane angle is large than 50 degrees above,the influence of wakes can be ignored.

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