通用型旋桨流速仪性能检定方法研究

Study on Calibration of General Propeller Flow Meters

流速仪检定主要问题是当检定仪器数量多、水体波动大,不符合流速仪检定理论和仪表标定原则,检定成果有可能形成系统误差,它既无标准,又难发现,用均方差表示则优。分析仪器运动机理,提出:低速,用力矩仪检测起转速V_0,使用标准修订值的低速直线公式;中、高速,用干式检测法,水力螺距检定法,积分检定法和优化一速度级检定法,后者还可用于水文测站验证流速仪检定公式。

While the number of test meters increases and the water body of tank fluctuates, the principle of flow meter test and calibration do not match. The result may lead to system errors. These errors are difficult to find and there are no standardized？criteria？for？assessing. This paper ana - lyzed the mechanism of the meters, which indicates that the speed of the instrument can be detected by the torque meter by starting speed Voat low speeds, and its speed linear formula can be revised by a standard value. At medium and high s pee ds, the dry te s t, hydraulic screw pitch test, integral test and optimized one-speed level calibration can be introduced, which also can be used to verify the flow meter calibration formula at hydrometry stations.