轴向位置变化对槽式机匣扩稳效果的影响

采用试验与数值手段研究周向槽处理机匣轴向位置对压气机性能的影响,在一亚声速转子上进行三种不同轴向位置的周向槽处理机匣试验.试验结果表明三个轴向位置的机匣处理均扩宽压气机的稳定工作范围,轴向位置不变时扩稳效果最好,轴向位置前移次之.数值计算所获得的裕度改进量变化趋势与实验的符合良好.通过详细地分析处理机匣轴向位置变化对压气机顶部区域流场结构的影响,揭示了周向槽处理机匣轴向位置对压气机性能影响的流动机理.

Influences of axial positions of grooved casing treatment on stall margin improvement

Experimental and numerical investigations were conducted to study the effects of axial positions of circumferential grooved casing treatment on compressor performance.Experiments of three different axial positions of circumferential grooved casing treatment were performed in a subsonic rotor.The experimental results show that three axial positions of groove casing treatment extend the steady operating range of the compressor at two rotating speeds.Groove with unchanged axial position has the best effect in extending the steady operating range,followed by the backward axial position moving.The calculated overall tendency for stall margin improvement fitted well with the experiment.The fundamental flow mechanism was obtained by in-depth analysis of the flow-filed at the blade tip,based on the effect of circumferential grooved casing position on the compressor performance.