不同管径下外夹式超声流量计仪表系数的实验研究

Experimental Study on Meters Factor of Clamp-on Type Ultrasonic Flowmeter with Different Pipe Diameters

为了研究外夹式超声流量计在不同管径不同流速点下的仪表系数变化规律,在DN100~DN400管径内选取6条管道,在0.3~3 m/s流速范围内选取6个流速点,进行流量计示值误差实验,得到流量计在相同管径下示值误差变化不大;随着管径的增大,示值误差逐渐减小,仪表系数逐渐增大。通过拟合数据建立数学模型,将数学模型下的仪表系数与实验仪表系数进行对比,验证了利用数学模型推导不同管径下仪表系数的可行性,有效提高了流量计在不同管径下的计量准确度。

To study the meters factor of clamp-on type ultrasonic flowmeter under different pipe diameters with different flow velocity points,six pipes are selected within the pipe diameter between 100 mm to 400 mm and six flow velocity points are selected within the range of 0.3~3 m/s to experimental study.The results of experiments show that the error of every flow point changed slightly under the same pipe diameter.With the increase of pipe diameter,the error under the same flow point decreases and the meters factor increases.By establishing mathematical model,the meters factors are compared between the mathematical model and the experimental study,it proves that of using the mathematical model to derive the meters factor under different pipe diameters is feasible,it can improve the measurement accuracy of the flowmeter under different pipe diameters.