叶轮风速表示值误差测试方法研究

Research on Test Method for Indication Error of Impeller Anemometer

摘要:

以皮托管和微压计测量的空气流速作为参考风速,研究叶轮式风速表的风洞实验室示值误差测试方法；介绍了叶轮式风速表的工作原理,分析了测试所用到仪器设备技术指标,进行了叶轮式风速表实例测试,对测试实例进行了不确定度评定与分析并作了示值误差的符合性判定；结果表明,5 m/s及以下时不确定度的最主要来源为风洞流场总压和静压差的测量,5 m/s以上时不确定度的最主要来源为风洞流场的不均匀性、皮托管与气流夹角等影响量,可通过提高微压计精度、减小风洞流场不均匀性和减小皮托管与气流夹角等方式进一步减小测量不确定度。

Abstract:

The method of measuring the indication error of impeller anemometer in wind tunnel laboratory was studied by taking the air velocity measured by pitot tube and micro differential pressure gauge as the reference wind speed. This paper introduced the working principle of the impeller anemometer, and analyzed the technical indexes of instruments used in the method. Then, an example of impeller anemometer was tested by using this method. The uncertainty of the test example was evaluated and analyzed, and the conformity of the indication error was determined. The results show that the most important source of uncertainty at 5 m/s and below is the measurement of velocity pressure in wind tunnel flow field, and the most important source of uncertainty above 5 m/s is the non-uniformity of the wind tunnel flow field and the angle between the pitot tube and the air flow. The measurement uncertainty can be further reduced by improving the accuracy of the micromanometer, reducing the non-uniformity of the wind tunnel flow field and reducing the angle between the pitot tube and the airflow.