基于半无限引压管效应的动态压力测量方法

实验研究了动态压力信号在有限和半无限引压管腔中传播的幅频特性及其与引压管结构变化的规律性关联.采用半无限引压管结构设计了头部为基尔整流罩的动态总压探针,测量大角度来流的气流总压,并对其动态传递函数进行标定.对一台轴流压气机转子尾迹的测量结果显示:动态总压探针可以测量到转子尾迹的总压流场特征,获得叶片端区流动等大梯度总压流场.对于采用引压管腔的动态探针设计中管径变化和弯曲造成信号能量的衰减作用,半无限引压管效应可有效减小动态压力信号的能量衰减,并减弱管腔的谐振效应.

Method of dynamic pressure measurement based on semi-infinite pressure tube effect

The amplitude-frequency characteristic of dynamic pressure signal through the semi-infinite and finite pressure tube was investigated, also its relationship with the shape of the inner diameter of the tube. With a semi-infinite pressure tube, a time-resolved total pressure probe with a Kiel structure was designed, and used to measure large angle inflow total pressure and calibrate its dynamic transfer function. The measurement results of the axial compressor rotor wake fields show that the semi-infinite pressure dynamic probe could get large gradient total pressure field, such as rotor wake and blade end flow. For design of the dynamic probe with pressure tube, both pressure tube diameter change and bending could attenuate signal energy, while semi-infinite pressure tube can availably keep dynamic pressure signal energy and decrease resonance effect.