级间引气对多级轴流压气机性能的影响

为了验证多级轴流压气机级间引气对其性能的影响，建立了在设计过程中优化改进级间引气的依据，基于数值模拟和试验的方法，研究了级间引气对某总压比20以上的10级轴流压气机总性能和匹配特性的影响。结果表明：引气对压气机各级的单级特性影响较小，但改变了压气机进口总流量和引气上下游的流量分配及级间匹配，进而影响了压气机的总性能。在多级轴流压气机设计转速状态下，前面级处于流量堵塞工况，与第7级引气相比，第4级引气可显著增大压气机的流量，改变压气机匹配特性，引气位置越远离压气机进口对总流量的影响越小。试验结果表明：第4级引气增加或者减少2%，总流量相应增加0.8%或者减少1.3%。相比第4级增加引气，第4级减少引气对压气机性能影响更为显著。试验得到的引气对压气机总性能、各级工作点匹配影响与数值模拟的一致。

Effect of Interstage Bleeding on Performance of Multistage Axial Compressor

To verify the effect of interstage bleeding on the overall performance of the multistage axial compressor, numerical and ex? perimental investigations of the effect of interstage bleeding on the overall performance and matching characteristics of a ten-stage axial compressor with a total pressure ratio over 20 were conducted. The numerical simulation results show that characteristics of individual stag? es are affected to a limited extent, while the overall mass flow rate and its allocation and matching near the bleeding location are altered, thus the overall performance of the compressor changed. For the multistage axial compressor, the front stages are choked at design speed. Compared with bleeding from stage 7, bleeding from stage 4 can significantly increase the mass flow rate of the compressor and change the interstage matching. The effect of bleeding on overall mass flow decreases as the location of bleeding is further away from the inlet of the compressor. Test results show that with a 2% increase or decrease of stage 4 bleeding, the increase and the decrease of total mass flow will be 0.8% and 1.3% respectively. For the Influence of stage 4 bleeding on compressor performance, the decrease is more significant than the increase. The effects of bleeding on compressor performance and working point matching of stages obtained from the rig test are consistent with that derived from the numerical simulation.