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research-article

Stability Enhancement with Self-recirculating Injection in Axial Flow Compressor

[+] Author and Article Information
Jichao Li

Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, People's Republic of China
lijichao@iet.cn

Juan Du

Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, People's Republic of China
dujuan@iet.cn

Zhiyuan Li

Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, People's Republic of China
lizhiyuan@iet.cn

Feng Lin

Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, People's Republic of China
linfeng@iet.cn

1Corresponding author.

ASME doi:10.1115/1.4039806 History: Received August 25, 2016; Revised February 28, 2018

Abstract

Self-recirculating injection, which bleeds air from the downstream duct of the last blade row and injects the air as a wall jet upstream of the first rotor blade row, is experimentally studied after well-design of its structure in single- and three-stage axial flow compressor respectively. The external injection and outlet bleed air are selected for comparison. Results show that the self-recirculating injection can improve the stall margin by 13.67% and 13% on the premise of no efficiency penalty respectively in single- and three-stage compressor for only 0.7% and 4.2% of the total injected momentum ratio re-circulated near stall. It is best among all the three cases if comprehensively considering the impact on pressure rise and efficiency. The details of flow field are captured by using a collection of pressure transducers on the casing with circumferential and chord-wise spatial resolution. The detailed comparative analysis of the endwall flow indicates that the self-recirculating injection can postpone the occurrence of stalling in the proposed compressor through delaying the forward movement of the interface between the tip leakage flow (TLF) and main stream flow, weakening the unsteadiness of TLF, and sharply declining the circumferentially propagating speed induced by TLF that triggers the spike-type stall inception. Finally, the stall control concept on the stage that first generates stall inception using self-recirculating injection is proposed. This study may be helpful to guide the design of self-recirculating injection in actual application.

Copyright (c) 2018 by ASME
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