叶顶引气位置对自循环机匣处理扩稳能力的研究

Study on Enhanced Stability Ability of Self-Circulating Casing Treatment by Blade Tip Bleed Positions

关键词:  压气机  自循环机匣处理  引气  叶顶泄漏流动

Key words:  Compressor  Self-circulating casing treatment  Bleed  Tip leakage flow

摘要:

为了探究自循环机匣处理的引气口位置在叶顶变化时对压气机稳定性的影响，以亚声速压气机孤立转子为研究对象，采用数值模拟的方法对3种叶顶不同引气位置的自循环机匣处理方案进行了扩稳能力的研究。结果显示，引气位置在叶顶沿轴向变化时，3种引气位置获得的流量裕度分别为5.43%，22.77%，18.23%，扩稳能力呈现出先增强后减弱的趋势，引气位置越靠近叶顶低速阻滞区核心，扩稳能力越强。对自循环机匣处理后的叶顶流场进行分析，可知在叶顶引气的自循环机匣处理的扩稳机理在于：通过抽吸叶顶处低速阻滞流体和抑制叶顶泄漏流动来改善叶顶区的流动状况，从而达到扩稳目的。

Abstract:

In order to investigate the effects of the bleed positions on the stability of isolated rotor of subsonic compressor, three schemes of self-circulating casing treatment with different bleed positions on the tip of the blade are studied by numerical simulation. The results show that the flow margins obtained from the three positions are 5.43%, 22.77% and 18.23% respectively when the bleed positions change along axial on the tip of blade. The stability expansion capacity shows a trend of strengthening first and then weakening. The closer the blade tip bleed position is to the core of the low-speed blockage zone, the stronger the stability expansion capacity is. Through the analysis of the blade tip flow field after self-circulating casing treatment, it can be seen that the stabilization mechanism of the self-circulating casing treatment is to improve the flow condition by sucking the low-speed blockage fluid on the tip of the blade and restraining the tip leakage flow, so as to achieve the purpose of stabilization.