Optimization Study of Gas Flow Measurement Method Based on Cavity Flow-induced Oscillation
Aiming at the weak oscillation signal of shallow cavity flowmeter,a deep cavity structure was adopted to optimize the gas flow measurement method based on cavity flow-induced oscillation.The oscillation principles of shallow and deep cavity structures were compared.Combining numerical simulation and experimental verification,the flow field and acoustic field distribu-tion characteristics in the deep cavity structure were analyzed,and the influence of gas velocity on the frequency and amplitude of acoustic oscillations was investigated.The results show that acoustic oscillation intervals with stable oscillation frequency and lar-ger amplitude can be excited in the deep cavity structure in a certain velocity range,and the amplitude of the oscillation signal shows a stable response law with the gas flow rate.The use of a variable-diameter pipe structure to enhance the local flow velocity at the inlet front of the resonant cavity allows this deep cavity to generate stable acoustic oscillations in a lower flow velocity range and a continuous range of flow velocities,which can be used to convert gas flow velocities in the range of 6.41～29.97 m/s,with the corresponding flow rates of 47.14～220.40 m3/h.
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