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以双排对转压气机为研究对象,研究了叶顶间隙对对转压气机性能参数的影响规律。针对大叶顶间隙时对转压气机性能严重恶化问题,从非定常的视角刻画了大叶顶间隙下,工作点变化对其内部流动特征的影响规律,结果表明:随着流量减小,对转压气机中上、下游转子叶尖泄漏涡非定常波动均有增强趋势,下游转子首发失速是对转压气机流动失稳的主要诱因。小流量工况下,叶顶主间隙泄漏涡与次泄漏涡的非定常干涉是下游转子内部非定常波动的主要成因;该工况时,下游转子叶顶间隙涡非定常周向波动强度强于径向波动强度,其影响范围也主要表现在叶顶前缘50%弦长范围内。频谱分析显示,上游转子叶尖泄漏涡非定常波动频率略小于下游转子区,下游转子区静压波动幅值约为上游转子的5倍。
Taking double-row counter-rotating compressor as the research object, the influence law of tip clearance on performance parameters of rotary compressor was studied. In view of the severe deterioration of the performance of the rotary compressor when the large blade tip clearance is large, the influence of the working point variation on the internal flow characteristics under the large blade tip clearance is depicted from the unsteady point of view. The results show that with the decrease of the flow rate, The unsteady turbulence of the tip vortex leakage in the upper and lower rotor of the compressor is enhanced. The initial stall of the downstream rotor is the main cause of the instability of the compressor. Under small flow conditions, unsteady interference of the main vortex leakage vortex with the secondary leakage vortex is the main cause of unsteady flow in the downstream rotor. In this condition, the unsteady circumferential fluctuation of the rotor vortex at the downstream rotor tip is stronger than Radial fluctuation strength, the impact range is mainly manifested in the front of the blade 50% chord length range. Spectrum analysis shows that the frequency of unsteady turbulence of upstream rotor tip vortex is slightly less than that of the downstream rotor zone, and the amplitude of static pressure fluctuation in the downstream rotor zone is about 5 times that of the upstream rotor.