基于文丘里流量传感器的湿气两相流量模型研究

Research on two-phase flow model for wet gas based on Venturi flow sensor

研究旨在通过计算流体动力学（CFD）仿真技术预测的湿气气、液两相流量。以双差压长喉颈文丘里流量传感器为测量手段。模拟压力范围0.4,0.6,0.8,1.0,1.2 MPa,气相体积流量范围为140-283 m^3/h,温度范围23-30℃,含液率范围0.5%-1.5%。文丘里流量传感器口径为DN100,节流比为0.55。多相流模型采用离散相模型（DPM）,利用欧拉壁面（EWF）模型以模拟管壁上的薄液膜。分析得出压力、气相流速和液相体积含率（LVF）对液膜厚度的影响规律。根据仿真结果建立基于双差压比值法的气、液两相流量预测模型。将仿真值与实验值进行比较,气相流量模型预测的均方根误差为1.8%,且液相流量模型预测的均方根误差为6.1%。

A two-phase flow model for wet gas predicted by CFD is researched. This simulation aims at dual differential-pressure long-throat Venturi flow sensor. Simulation pressure ranges of 0. 4 - 1. 2 MPa,gas phase volume flow range of 140 m^3/ h- 283 m^3/ h,temperature range of 23 - 30 ℃,liquid of volume fraction is range of0. 5- 1. 5 %. The diameter of Venturi flow meter is 100 mm and throttle ratio is 0. 55. The multiphase flow model uses discrete phase model（ DPM）,Eulerian wall film（ EWF） model is used to simulate thin liquid film on pipe wall. Influence rule of pressure / gas phase flow velocity and liquid volume fraction（ LVF） on liquid film thickness can be found from analysis. Gas liquid flow prediction model are set up based on dual differential pressures ratio method according to simulation result. Compare simulation value and experimental value,it shows that root mean square error（ RMSE） of gas flow model prediction is 1. 8 %,and RMSE of liquid phase flow model prediction is6. 1 %.