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开展了恒温(CT)热线风速仪校准方法的研究,以满足可压缩流体中湍流度测量需求。将对数函数与多元回归技术相结合,建立了恒温热线风速仪校准的数学模型,并进行了风洞湍流度测量试验验证。在马赫数Ma=0.3~0.55范围内进行了校准试验,根据建立的数学模型对试验数据进行拟合,拟合优度R2=0.999 82,平均绝对速度偏差Δu=0.18m/s,基本满足了恒温热线风速仪校准精度要求。对马赫数Ma=0.55条件下流场进行了湍流度测量,速度测量偏差为0.034%,流场湍流度Tu=0.14%。试验结果证明了恒温热线风速仪应用于可压缩流体速度测量的可行性。
A study was conducted on a calibration method for a thermostatted (CT) hotline anemometer to meet turbulence measurement requirements in compressible fluids. Combining the logarithmic function and multiple regression technique, a mathematical model for calibration of a thermostat hot-wire anemometer was established, and wind tunnel turbulence measurement test was carried out. The calibration test was carried out in the range of Mach number from 0.3 to 0.55. The experimental data were fitted according to the established mathematical model. The goodness of fit R2 = 0.999 82 and the mean absolute speed deviation Δu = 0.18 m / s basically met Constant temperature hot wire anemometer calibration accuracy requirements. The turbulence measurement was carried out on the flowfield with Ma = 0.55. The velocity measurement deviation was 0.034% and the turbulence flow field Tu = 0.14%. The test results demonstrate the feasibility of a constant temperature hot wire anemometer for compressible fluid velocity measurements.