超声波气体流量计的管道模型仿真和误差分析

Model simulation and error quantitative analysis of pipeline of ultrasonic gas flowmeter

为满足不断发展的超声波气体流量计测量精度的需要,改进传感器的设计精度和有效降低安装测试及样机调试成本,针对制约超声波气体流量计测量精度主要误差源之一的管道流场分析问题,结合计算机建模数值仿真技术及实验技术对其流场设计参数以及弯管安装条件等对超声波测量误差产生原因进行定量分析。理论研究和仿真实验结果表明,可以量化分析气体超声波流量计流场误差产生的原因、范围,并通过限定流场修正系数更有效地降低其测量误差,这项研究对该超声波气体流量计的优化设计和工程应用具有一定的指导意义。

In this paper, for the purpose of improving sensor measurement accuracy and reducing installation and test cost, the systematic error analysis for the ultrasonic gas flow meter test process in the flow field of pipeline has been carried out. On the base of qualitative analysis and combination of numerical simulation technology and experimental technology, the gas flow meter measurement accuracy influenced by flow field design factors and pipe installation conditions has been studied. Theoretical research and simulative experiment results prove that the flow field errors and scopes in ultrasonic gas flow meter measurement system can be analyzed quantitatively using the research results of this paper. Besides, the measurement errors can be more effectively reduced through limiting the flow field correction factors. It is concluded that these studies will have certain significance on the optimization design and future application of ultrasonic transducer.