摘要
热线的方向系数对湍流测量精度很有大的影响。对于Ｘ型探头，热线的方向系数耦合在校准曲线里，这给热线校准带来一定的困难。本文提出一种同时求出Ｘ探头的热线方向系数和校准曲线的逐步逼近法，并测得两根热线的方向系数为０．３０７和０．２５８。此值与单针探头的方向系数不同。在三角形钝体尾流的测量中，本文还评估了方向系数对雷诺应力测量值的影响。实验表明，如果不考虑方向系数，最大误差可达１０％
The directional sensitivity of hot-wire effects the measurement accuracy. It is difficult to calibrate an X-probe,since the directional coefficient is coupled into the calibration curve. This paper describes a succesive approximation technique for obtaining the directional coefficients of an X-probe and its calibration curve. An evaluation of the effect of the directional sensitivity on the turbulence measurement has been made. It is shown that neglecting the directional coefficient yields a maximum error 10% in the measurement of Reynolds stress.
出处
《空气动力学学报》
CSCD
北大核心
1996年第1期39-45,共7页
Acta Aerodynamica Sinica
基金
华中理工大学煤燃烧国家重点实验室资助
关键词
热线风速仪
方向系数
湍流测量
hot-wire anemometer
directional sensitivity
turbulence measurement
