作者：马雪林¹, 徐雅¹, 谢代梁¹, 徐志鹏¹, 曹松晓¹, 胡鹤鸣²

作者单位：1. 中国计量大学 浙江省流量计量技术重点实验室 ， 浙江 杭州 310018;
2. 中国计量科学研究院， 北京 100029

关键词：多声道;超声波流量计;流声耦合;数值模拟

摘要：

时差法超声波流量计的测量精度的提升难点在于明晰声波在其内部的传输问题。为探究在水流量测量中多声道超声波流量计的使用及其流-声耦合特性，对一个DN200的5声道超声流量计进行流-声耦合的数值模拟研究。利用RKDG法求解声传播方程，定量分析不同声道截面下流速分布、换能器端面的声压信号分布，并给出不同声道下声波在管道流体中的传播动力学过程，分析声波与管壁之间的相互作用及其对信号传输的影响，得到该模型下不同流速时的系统计算误差。该仿真分析中所涉及的流-声耦合特性研究结果对多声道超声波流量计测量性能的提升具有重要意义。

Simulation analysis of flow-acoustic coupling characteristics in multichannel ultrasonic flowmeter
MA Xuelin¹, XU Ya¹, XIE Dailiang¹, XU Zhipeng¹, CAO Songxiao¹, HU Heming²
1. Key Laboratory of Flow Measurement Technology of Zhejiang Province, China Jiliang University, Hangzhou 310018, China;
2. National Institute of Metrology, China, Beijing 100029, China
Abstract: The difficulty in improving the measurement accuracy of the time difference ultrasonic flowmeter is to understand the internal sound wave transmission problem. In order to explore the use of multichannel ultrasonic flowmeter in water flow measurement and its flow-acoustic coupling characteristics, a numerical simulation study of flow-acoustic coupling was carried out on a DN200 5-channel ultrasonic flowmeter. The RKDG method is used to solve the sound propagation equation, the velocity distribution on the sound channel and the sound pressure signal distribution on the end face of the transducer are quantitatively analyzed, get the dynamic process of sound wave propagation in pipe fluid under different sound channels, the interaction between acoustic wave and tube wall and its influence on signal transmission are analyzed, the system calculation error at different flow rates under this model is obtained. The research results of the flow acoustic coupling characteristics involved in the simulation analysis are of great significance to the improvement of the measurement performance of the multichannel ultrasonic flowmeter.
Keywords: multichannel;ultrasonic flowmeter;flow-acoustic coupling;numerical simulation
2021, 47(5):123-128  收稿日期: 2020-10-30;收到修改稿日期: 2020-11-10
基金项目: 国家重点研发计划（2018YFF0216001）
作者简介: 马雪林(1996-),女,宁夏固原市人,硕士研究生,专业方向为超声波流量测量
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