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本文论述的是跨音速流中常温垂直和倾斜热线风速仪的校测。校测的对象是热线对质量流速率、密度和方向的敏感系数。校测的实验是在一个可变密度的暂冲式超音速风洞的喷管段中进行的,马赫数范围为0.5—1.36,雷诺数范围为100—320,过热比为1.0左右。实验表明,在这样的条件下,质量流速率和密度敏感系数几乎相等,基本上跟马赫数和雷诺数无关;方向敏感系数也跟雷诺数无关。同时,用Behrens的经验关系式估计了密度敏感系数和速度敏感系数,与实验数据作比较,结果二者的趋势是一致的。
This article discusses the calibration of ambient temperature vertical and inclined hot wire anemometers in a transonic flow. The target of the calibration is the sensitivity of the hot line to mass flow rate, density and direction. The calibration experiments were conducted in a nozzle section of a variable density, temporary-injection supersonic wind tunnel with a Mach number ranging from 0.5 to 1.36, a Reynolds number in the range of 100-320, and an overheat ratio of about 1.0. Experiments show that under such conditions, mass flow rate and density-sensitive coefficients are almost equal, basically independent of Mach number and Reynolds number; direction sensitive coefficient has nothing to do with Reynolds number. At the same time, the density sensitive coefficient and velocity sensitive coefficient were estimated by empirical relationship of Behrens. Compared with the experimental data, the trend of the two is consistent.