时差法测流系统流量计算方法研究与应用

Research and Application of Flow Calculation Method for Time Difference Measuring System

摘要: 目前国内外对超声波时差法测流系统流量计算方法研究相对较少，对此本文结合时差法测流原理、流速面积法、多系数校正分析详细阐述超声波时差法流量计算方法，并通过曲线拟合、建立回归模型来确定校正系数和率定关系。为验证方法的准确性及可靠性，以伍市水文站为例，进行长期的时差法流量监测，并与流速仪测量数据进行了对比，结果表明采用该方法计算校正后的流量数据与流速仪测量结果一致性较好，此外该方法易于实现，可适用于测验较好的场景超声波时差法测流应用。

Abstract: At present, there is relatively little research on the flow calculation method of ultrasonic time difference measurement system at home and abroad. In this paper, the flow measurement principle of ultrasonic time difference method, velocity area method and multi-coefficient correction analysis are combined to elaborate the flow calculation method of ultrasonic time difference method, and the correction coefficient and calibration relationship are determined by curve fitting and regression model. In order to verify the accuracy and reliability of the method, the Wushi hydrology station was taken as an example to carry out long-term flow monitoring by the time difference method, and the measured data of the current meter were compared. The results show that the corrected flow data calculated by the method is in good agreement with the measured results of the current meter. In addition, the method is easy to implement, and can be applied to the ultrasonic time difference method in the scene with good test.