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前言在发动机地面试验中,通常有两种测量气流角的方法:一是用三孔总压方向管按所测P_1、P_2和P_3值在其速度——方向特性曲线上查取气流角;二是用方向管使P_1=P_3时,探针对准气流方向,探针对原始位置的偏离即所测气流角。由气流方向跟踪仪使P_1=P_3,则可快速、准确的直接测出气流角。与方向组合设计的其它气动参数,如静压、总压和总温在对准气流方向测量时,也能提高测量准确度。对于五孔或球形三元方向管,有气流方向跟踪仪在赤道面上实现方向跟踪后;在子午面上可用上述第一种方法测量俯仰角,使三元方向管的校准曲线简化,达到实用的目的。
Preface In the engine ground test, there are usually two methods to measure the air flow angle: one is to check the air flow angle on the speed-direction characteristic curve with three-hole total pressure direction pipe according to the measured P 1, P 2 and P 3 values; Is the direction of the tube to make P_1 = P_3, the probe is aimed at the direction of the air flow, the deviation of the probe to the original position is measured air flow angle. By the airflow direction tracker P_1 = P_3, you can quickly and accurately directly measure the airflow angle. Other aerodynamic parameters designed in combination with the direction, such as static pressure, total pressure and total temperature, also improve measurement accuracy when measured in the direction of the airstream. For a five-hole or a spherical ternary tube, the airflow direction tracker can track the direction of the equatorial plane. The first method above can be used to measure the pitch angle on the meridional plane to simplify the calibration curve of the ternary tube, the goal of.