基于双差压的脉动流测量方法仿真研究

通过对脉动流工况下差压式流量计理论模型进行分析，提出基于双差压测量以消除流量导数项影响的算法，利用FLUENT软件对经典文丘里管内动态流场进行仿真，进而对脉动流量计算方法进行验证。仿真结果表明，利用传统单路压差法计算脉动流量时，由于遗漏流量导数项可产生很大测量误差，最大误差甚至可达-100%；而通过双路差压法计算脉动流量，能够有效消除流量导数项的影响，算例中最大误差降至5%左右。验证结果表明基于双路差压测量的计算方法可有效提高脉动流量测量准确度，具有技术借鉴价值。

Simulation of Pulsating Flow Measurement based on Double Differential Pressure

Based on the theoretical model analysis of differential pressure flowmeter under pulsating flow condition, the algorithm of eliminating the influence of flow derivative term based on the double-channel differential pressure is given. The flow field in Venturi tube is simulated by FLUENT software, and then the calculation method of pulsating flow is verified. The simulation results show that the maximum error can be up to 100% when calculating the fluctuating flow using single-channel pressure, and the maximum error can be reduced to about 5% when calculating the fluctuating flow using double-channel differential pressure. The results show that the calculation method of double-channel differential pressure method can effectively improve the accuracy of pulsating flow measurement, and has the value of further popularization and application.