Numerical simulation-based experimental study on theeffect of different disturbed flow components on ultrasonic flowmeter metering performance

Ultrasonic flowmeter is a velocity flowmeter, and its measurement accuracy is greatly affected by the flow field in the pipeline. In the actual use process, due to the installation conditions are not ideal, the formation of vortex flow, pulsating flow, asymmetric flow and other non-ideal flow field in the pipe, which in turn affects the accuracy of ultrasonic flowmeter. This study is based on CFD numerical simulation technology, 90 ° elbow, reducer, upstream and downstream flange diameter difference of one level and other typical disturbance elements on the impact of the flow field in the pipe, simulate the flow field of the gas in the closed pipe after the disturbance elements, and calculate the resulting error, found that the impact of each disturbance element on the ultrasonic flowmeter measurement error increases with the increase in operating flow. For 90 ° elbow, the upstream and downstream flange diameter differ by one level,we use these two installation conditions to carry out real flow test, through the test data and simulation results for comparison and analysis, the results are consistent. At the same time, the use of experimental data on the simulation model correction, can guide the construction and transformation of ultrasonic flowmeter metering process, improve the accuracy of the measurement results, and effectively maintain the fairness of the trade handover.