二等皮托管测风误差分析及偏差模拟计算

皮托管是组成风速检定装置的主要计量标准设备,其测量精度对检定质量具有重要影响.从皮托管测风原理出发,详细介绍了影响皮托管测风误差的相关因素,模拟计算了各因素对风速测量产生的影响,分析了影响皮托管测风误差的主要因子.结果表明：温度和阻塞系数是影响二等皮托管测风误差的主要因素.当环境温度偏差为±8℃时,可引起二等皮托管风速测量误差为干0.44 m/s（v=30 m/s）.当阻塞修正系数偏差±0.02时,可引起二等皮托管风速测量误差±o.6 m/s（v=30 m/s）；皮托管系数、大气压力和湿度经修正后对二等皮托管测风精度影响相对较小.

Measurement Error Analysis and Deviation Simulation of Second Class Pitot Tube

The Pitot tube is the main standard device of the wind calibration facility, whose measurement accuracy is important for calibration quality. From the measurement principles of Pitot tube, the factors influencing the measurement errors of Pitot tubes are introduced in detail. The measurement deviation causing by these influence factors is simulated. The main influencing factors of measurement errors Of Pitot tubes are analyzed. The results show that the temperature and obstruction coefficients are the main factors to produce measurement errors for second-class Pitot tubes. When the deviation of environment temperature reaches ±8℃, the wind error of the Pitot tube is ±0.44 m/s （v=30 m/s）. When the deviation of obstruction coefficient reaches ±0. 02, the wind error of the Pitot tube is ±0. 6 m/s （v=30 m/s）. The effects of the Pitot tube coefficient, pressure, and humidity are smaller.