基于空腔流激振荡的气体流量测量方法优化研究  

Optimization Study of Gas Flow Measurement Method Based on Cavity Flow-induced Oscillation

作　　者：袁江琦 徐雅 谢代梁[1] 刘铁军[1] 黄震威 YUAN Jiangqi;XU Ya;XIE Dailiang;LIU Tiejun;HUANG Zhenwei(China Jiliang University,Zhejiang Key Laboratory of Flow Measurement Technology)

机构地区：[1]中国计量大学,浙江省流量计量技术重点实验室

出　　处：《仪表技术与传感器》2024年第9期28-33,共6页Instrument Technique and Sensor

基　　金：浙江省科技计划项目(2022C01244);浙江省属高校基本科研业务费专项资金资助项目(2021YW50)。

摘　　要：针对浅腔型空腔流量计存在的振荡信号弱的问题,采用一种深腔结构对基于空腔流激振荡的气体流量测量方法进行了优化研究。对浅腔和深腔结构的振荡原理进行了对比,结合数值模拟及实验验证分析了深腔结构中的流场及声场分布特性,探究了气体速度对声振荡频率及幅值的影响规律。研究结果表明:在一定的速度范围内深腔结构中可激发振荡频率稳定、幅值更大的声振荡区间,且振荡信号的幅值与气体流速呈现稳定的响应规律;采用变径管结构提升谐振腔入口前沿的局部流速,可使该深腔在更低的流速范围内产生稳定声振荡,且流速范围连续,可用于换算6.41~29.97 m/s范围内的气体流速,相应的流量为47.14~220.40 m3/h。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 distribution 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 larger 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.

关 键 词：空腔流激振荡 流量测量 大涡模拟 声学谐振 

分 类 号：TH814[机械工程—仪器科学与技术]