Effects of probes with different structures on the flow field and measurement results of imported compressors

不同结构探针对压气机进口级流场及测量结果的影响

¹ School of Power and Energy, Northwestern Polytechnical University, Xi'an 710129, China
² General Research Department, China National Aero-Developmerot, Zhuzhou 412002, China

Received: 10 November 2020

Abstract

In this paper, the measurement accuracy of two different types of total pressure probe and total temperature probe in turboshaft engine compressor inlet channel and the influence of these two probes on the flow field through numerical simulation was studied. At the same time, the influence of the probe structure and installation position on probe measurement results under three typical working conditions of cruise, maximum continuous and takeoff was analyzed. The simulation results showed that the higher the engine inlet flow rate, the greater the measurement error of the probe. Comparing with the total temperature probe, the total pressure probe measurement accuracy is more influenced by the flow rate. The velocity uniformity is less affected by the engine operating conditions and is mainly related to the structure of the inserted probes. The closer the total pressure probe to the support plate, the greater the measurement error. The probe installation position has a small effect on the total pressure loss coefficient at the outlet.

摘要

采用数值模拟的方法，研究了某涡轴发动机压气机进口级流道中2种不同类型的总压探针和总温探针的测量精度以及这两种探针对流场的影响，分析探针在巡航、最大连续、起飞3个典型工作状态下，探针结构以及安装位置对探针测量结果的影响。研究结果表明：发动机进口流量越大，探针的测量误差越大；相较于总温探针，总压探针测量准确度受流量的影响更大；速度均匀度受发动机工况的影响较小，主要与插入的探针结构有关；越靠近支板的总压探针，测量误差越大；探针安装位置对出口处总压损失系数的影响较小。