以某型高压九级轴流压气机为研究对象，利用NUMECA软件在不同进口条件下进行变工况性能模拟计算。研究了变转速下由于进口总温、总压的改变引起的雷诺数变化对压气机性能影响。结果表明：试验条件与设计条件下的试验结果相比，进口雷诺数由1.348×106下降到4.318×105，压气机设计点折合流量比减小0.008，效率下降0.72%，喘振裕度降低了8.11%，压气机性能曲线整体向左下方移动；在一定范围内升高进口总压或降低进口总温，将改善压气机的压比、效率以及折合流量比；当雷诺数高于一定临界值后，同一转速下的压气机的效率以及折合流量比基本保持不变；当转速降低至设计转速以下时，临界雷诺数将进一步增大，雷诺数效应影响增强；雷诺数降低会导致泄漏流损失增大，径向涡损失增强，加剧叶尖区域的流动分离，此时叶尖区域的流动阻塞成为引起流动失稳与整机性能恶化的主要原因。

The performance of variable working condition for a high pressure ninestage axial flow compressor was simulated and calculated by NUMECA software under different inlet conditions.The influence of Reynolds number variation on compressor performance due to the change of inlet total temperature and pressure at variable speed was studied.The results show that comparing the test conditions with the design conditions,the inlet Reynolds number decreases from 1.348×106 to 4.318×105,the reduced flow ratio at the design point decreases by 0.008,the efficiency decreases by 0.72%,the surge margin decreases by 8.11%,and the compressor performance curve moves to the left and down integrally.Increasing the inlet total pressure or decreasing the inlet total temperature within a certain range will improve the pressure ratio,efficiency and reduced flow rate of the compressor.When the Reynolds number is higher than a certain critical value,the efficiency and reduced flow rate of the compressor at the same speed remain basically unchanged.When the rotational speed decreases below the design rotational speed,the critical Reynolds number will further increase and the influence of Reynolds number effect will be enhanced.The decrease of Reynolds number will increase the leakage flow loss and the radial vortex loss,which will intensify the flow separation in the tip region.At this time,the flow blockage in the tip region is the main cause of flow instability and complete machine performance deterioration.

TK45

国家科技重大专项（2017-Ⅱ-0006-0019）