槽式机匣槽宽变化对扩稳效果影响的试验与数值研究

 采用试验与数值手段研究周向凹槽槽宽变化对压气机性能的影响，在一亚声速转子上进行3种不同槽宽的周向槽处理机匣试验。试验结果表明3种不同槽宽的机匣处理都提高压气机的失速裕度，最小槽宽的扩稳效果最好，其他两宽槽次之。数值计算所获得总性能与试验结果符合良好。通过详细地分析凹槽槽宽变化对压气机顶部区域流场结构的影响，揭示了周向槽槽宽对压气机性能影响的流动机理。

Impact of Grooved Width of Grooved Casing on Stall Margin Improvement

Experimental and numerical investigations are conducted to study the effect of the grooved width of a grooved casing on the performance of a compressor.Three grooved widths of a circumferential grooved casing are tested in a subsonic rotor.Experimental results show that all the three groove widths of the grooved casing treatment increase the stall margin of the compressor.The narrow groove has the best effect on increasing the stable operating range while the effect of the two wider grooves is less satisfactory.The calculated overall performance lines show good agreement with the results of the experiment.The fundamental flow mechanism is obtained by a detailed analysis of the flow field at the blade tip,which indicates how the groove width of circumferential grooved casing treatment affects compressor performance.