单点总压探针安装位置对压气机进口级出口流场及测量结果的影响

Influence of single-point total pressure probe installation position on the flow field and measurement results of the inlet stage outlet of the compressor

采用数值模拟的方法,研究了某涡轴发动机压气机进口级出口流道中单点L型总压探针的测量精度以及探针对流场的影响,分析在巡航、最大连续、起飞3个典型工作状态下,探针测量结果随流量的变化规律,以及安装位置对探针测量结果的影响。研究结果表明:随着进口流量增加,探针的测量误差逐渐增加,当D/d为6.5时,探针总压相对测量误差最小,且测量误差与流量呈线性关系;相较于叶背,当安装位置在叶盆附近时,探针总压相对测量误差最大;当探针安装位置越靠近叶背,探针下游的总压损失系数下降速度越慢,探针在流向的影响范围更大;当安装位置在叶盆和叶背附近时,探针下游5~24 mm之间的速度均匀度较小。

The measurement accuracy of a single-point L-type total pressure probe in the inlet stage outlet flow path of a vortex engine compressor and the influence of the probe on the flow field were investigated via numerical simulation.The change pattern of probe measurement results with flow rate under three typical operating conditions of cruise,maximum continuous and takeoff were analyzed,as well as the influence of the installation position on the probe measurement results.The present results show that the measurement error of the probe gradually increases with the increasing of inlet flow rate.The relative measurement error of total probe pressure is the smallest and the measurement error is linear with the flow rate at a ratio(D/d)of 6.5.The relative measurement error of the total probe pressure is greatest when the installation position is located near the leaf basin compared to the leaf back.As the probe is installed closer to the back of the leaf,the total pressure loss coefficient downstream of the probe decreases more slowly and the probe has a greater range of influence on the flow field in the flow direction.When the installation position is located near the leaf basin and leaf back,the velocity uniformity between 5 mm and 24 mm downstream of the probe is smaller.