一种便携式高精度超声流量仪

Portable high-precision ultrasonic flow measurement system

摘要:

研究一种超声波传播方向平行于液体流动方向的流量管和以此为基础的超声流量仪。针对流量系统的新型流量管结构推导两种流量算法并进行误差分析，其中一种算法可以减小由声速变化引起的误差，从而提高系统的测量稳定性，也为流量管的改进方向提供了思路。使用测显比曲线修正管道中流体流速分布不均匀的影响以提升测量准确性，试验证明，在测量范围内，系统测量的平均示值误差不超过 0.2%。

Abstract:

This paper presents a portable ultrasonic flow measurement system based on a new flow tube with the ultrasonic sensor parallel to the direction of liquid flow. Based on the new flow tube structure of the flow measurement system, two flow calculating algorithms are deduced and error analysis is performed. It is found that one of the algorithms can reduce the error caused by the change in sound velocity, which improves the measurement stability of the system and can also suggest ideas for improvement. This system uses the Qs-k ratio curve to correct the influence of uneven flow velocity distribution of the moving fluid. Within the measurement range, experiment shows that the error of the measured value of the system does not exceed 0.2%.