两种径向间隙处理对1.5级高负荷轴流压气机性能影响的比较研究

Comparative Study on the Effects of Two Kinds of Radial Clearance Treatment on the Performance of 1.5-stage High Load Axial Flow Compressor

采用数值模拟方法研究了机匣直沟槽处理和斜沟槽处理对压气机气动性能的影响,对两种处理方式下压气机各叶栅通道的熵产、涡量、回流范围和强度、静压分布、负轴向速度进行了定量计算和定性分析。结果表明:与光壁机匣相比,直沟槽和斜沟槽处理均使压气机的稳定运行范围拓宽了3%以上,直沟槽机匣处理压气机比斜沟槽机匣处理压气机的失速裕度更高,但绝热效率略低。

The effects of cylindrical trench casing treatment and sloped trench casing treatment on the aerodynamic performance of compressor are studied using a three-dimensional numerical simulation.Based on the quantitative calculation and qualitative analysis of the entropy production,vorticity,the range and intensity of the reverse flow,static pressure distribution and negative axial velocity in each cascade channel of compressor under two kinds of treatment modes,it is found that compared with the smooth casing compressor,the cylindrical trench and sloped trench casing treatment both broaden the stable operation range of the compressor by more than 3%.The stall margin of the cylindrical trench casing treatment compressor is wider than that of the sloped trench casing treatment compressor,but its adiabatic efficiency is slightly lower than the latter.