| Citation: | GUO S N，SONG W，XIANG N L，et al. Dynamic characteristics of turbine flowmeter based on CFD simulation[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（8）：1904-1911 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0594
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Currently, the aerospace industry has increasingly strict requirements for flow measuring, and therefore, studying the dynamic characteristics of the flowmeter is of great significant for improving the measurement performance and online measurement performance in various environments. In this paper, the dynamic performance of the turbine flow meter is studied by the numerical simulation. Two interference signals are applied at the turbine flowmeter inlet, and by data processing, the amplitude frequency characteristics, phase frequency characteristics, transfer functions, and step response curves of the system are obtained. The results show that the turbine flowmeter can be analyzed as a first-order system, and the frequency of pulsating flow is the main factor affecting the performance of turbine flowmeter.Compared with 5 Hz, 60% reduction in amplitude ratio under 50 Hz operating condions. The phase difference increases with the increase of frequency, the maximum phase difference reaches a nearly 40°, the speed of the step response is related to the size of the step stream, and the temporal constant generated by the negative step is greater than the time constant generated by the positive step.
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