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Mechanism Analysis of Stability Enhancement by Self-recirculating Casing Treatment for Centrifugal Compressor
Received date: 2013-12-30
Revised date: 2014-04-01
Online published: 2014-04-16
Supported by
National Natural Science Foundation of China (51206163)
Self-recirculating casing treatment is known to increase the stable operating range of centrifugal compressors. Suction and reinjection of backflow have obvious macro-flow features. The main flow can be considered as two parts. One is mixed with the backflow, and the other is not. The rotor can be seen as inducer and impeller. The casing treatment has different effects on them. Flow field simulation is carried to show that the quantity, the area, and the reinjected angle of backflow are three important factors. It is found that the reinjection of backflow can decrease angle of attack by mixing and accelerating the main flow. The casing treatment can enhance flow capacity, take away tip separation and alter span loading distribution of the rotor. With casing treatment, tip loading is decreased for inducer and the ability to do work is improved for tip region of impeller. Thus, the onset of flow instability is delayed.
Key words： self-recirculating; casing treatment; suction; injection; stall margin; centrifugal compressor
KANG Jianxiong , HUANG Guoping , ZHU Junqiang , WEN Dianzhong . Mechanism Analysis of Stability Enhancement by Self-recirculating Casing Treatment for Centrifugal Compressor[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(12) : 3264 -3272 . DOI: 10.7527/S1000-6893.2014.0037
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