对转压气机中自循环机匣处理扩稳机理的研究

为拓宽自循环机匣处理的适用范围,以对转压气机为研究对象,采用数值方法研究了自循环机匣处理的扩稳机理和轴向喷气位置对其扩稳能力的影响,详细分析了自循环机匣处理前后对转压气机的总体特性和转子叶尖流场的变化.结果表明:对最先失速的转子配置自循环机匣处理可以获得可观的裕度改善,但轴向喷气位置对扩稳效果和压气机的气动性能均有显著...

Study on the mechanism of stability improvement of the self-recirculating casing treatment in a counter-rotating compressor

In order to broaden the application range of self-recirculating casing treatment（SRCT），a counter-rotating compressor was used as the research object.The stability enhancement mechanism of SRCT and the effect of axial injection position on its stability expansion ability were studied by numerical method.The overall characteristics of the counter-rotating compressor and the change of rotor tip flow field with/without self-recirculating casing treatment were analyzed in detail.The results showed that considerable stall margin improvement can be obtained by configuring a self-recirculating casing on the rotor that stalled first，but the axial injection position had an important effect on the stability improvement effect and the aerodynamic performance of the counter-rotating compressor.The axial injection position should not be too close to the leading edge of the blade；when the injection position was 40% of the axial chord length from the leading edge of the blade，the improvement of stall margin was 7.73% and the peak efficiency loss was minimum.Self-recirculating casing treatment can delay stall by reducing blade tip load，weakening the strength of the tip secondary leakage flow and restraining the mixing of the tip leakage flow and main flow.The first stall stage of counter-rotating compressor can be changed by self-recirculating casing treatment，without change of the stall initiation type.