Control Method And Experimental Verification Of Pipeline Flow Fluctuation Generator

In the actual flow measurement process, flow fluctuations often propagate in the pipeline, which may cause large deviations in the flow measurement results. In order to systematically study the influence of different flow fluctuations on the measurement results of the flowmeter, it is necessary to simulate different controllable flow fluctuations in the pipeline. This paper designs different wave control methods for a vane flow fluctuation generator, and uses LabVIEW programming to control the motor to drive the butterfly valve to swing, forming controllable flow fluctuation of sine wave, frequency conversion sine wave and variable amplitude sine wave in the pipeline. Finally, based on the hot water flow standard facility of National Institute of Metrology(NIM), a real flow experiment is designed to verify the control method of the fluctuation generator. Experimental results show that the proposed control method can control the flow fluctuation generator to generate controllable sine wave, frequency conversion wave and variable amplitude wave , and the flow fluctuation can be propagated along the pipeline upstream and downstream.