离心压缩机喘振特性及喷射扩稳研究

以某单级离心压缩机为研究对象,搭建工况动态特性实时监测系统,通过控制排气调节阀的开度展开喘振实验研究,在此基础上,设计和实现离心压缩机的主动控制喷射扩稳,通过小孔喷射高速气流实现喘振裕度的提升。研究表明:出口压力脉动幅度大大高于进口压力脉动,进气管道流动进入深度喘振的起始时刻要落后于排气管道进入深度喘振的起始时刻;机匣喷射在增大喘振裕度的同时提高了排气压力,增大的气流喷射量使扩稳效果更加显著;机匣喷射改善了叶顶区域的流动状况。

Investigations on surge characteristics and stability enhancement by hole injection for a centrifugal compressor

By taking a single-stage centrifugal compressor as the research object,a real-time monitoring system for the dynamic operation characteristics of the compressor was established.The surge experiment was carried out by controlling the opening of the exhaust regulating valve.Based on this,the active control casing injection (ACCI) for stability enhancement was designed and realized,and the surge margin was improved by hole-injecting high-speed air flow into the impeller passage.The research results show that the amplitude of pressure fluctuation at the outlet is much higher than that at the inlet,and the initial moment when the flow in the intake pipe enters the deep surge lags behind the initial moment when the flow in the exhaust pipe enters the deep surge.The casing injection increases the exhaust pressure while increasing the surge margin,and the increase of the injection massflow makes the stability enhancement effect more significant.The casing injection improves the flow condition in the region near the blade tip.