双向内外管压差流量计关键参数优化

Optimization of Key Parameters of Two-Way Inner and Outer Tube Differential Pressure Flowmeter

针对现有的对双向内外管压差流量计关键结构的参数研究准确度不足的问题,在以往研究的基础上,提出了一种新的评价指标压损差,压损差为节流件内外的压差信号和前后压损的差值。相较于以往的压损比,更加科学合理。通过分析,确定影响双向内外管压差流量计性能指标的三个主要参数为异径比k、扩散角θ和节流件的大径R。通过三因素三水平的二次回归正交试验设计,设计出15组正交试验,建立模型,利用FLUENT进行仿真,并记录分析数据,拟合出回归方程,利用Matlab优化工具箱中的fmincon函数对得到的目标函数进行寻优计算,确定最优结构参数。最后进行验证,确定所得的结构参数的性能为最优。

Aiming at the problem of insufficient accuracy of the existing parameters research on the key structure of the two-way inner and outer tube differential pressure flowmeter,based on the previous research,a new evaluation index pressure loss difference is proposed,and the pressure loss difference is inside and outside the throttle.The difference between the differential pressure signal and the pressure loss before and after.Compared with the previous pressure loss ratio,it is more scientific and reasonable.Through analysis,the three main parameters that affect the performance index of the two-way inner and outer tube differential pressure flowmeter are the aspect ratio k,the diffusion angleθand the large diameter R of the throttle.Through the three-factor and three-level quadratic regression orthogonal test design,15 sets of orthogonal experiments are designed,the model is established,and the simulation is performed by FLUENT.The analysis data is recorded,the regression equation is fitted,and the fmincon function in the toolbox is optimized by Matlab.The obtained objective function is optimized and the optimal structural parameters are determined.Finally,verification is performed to determine the performance of the obtained structural parameters as the most desirable result.