多孔孔板流量计流场仿真

为准确计算多孔孔板流量计流场,采用Standard k-ω模型、SST(剪切应力传输)k-ω模型、Standard k-ω+SST k-ω(Standard k-ω模型的计算结果作为SST k-ω模型仿真计算的初始值)组合模式分别对100,mm口径、节流比为0.6的3种结构多孔孔板流量计流场进行数值计算,并结合射流理论以及实流实验结果对数值计算结果进行分析.结果表明:对于中心节流孔与环形排列孔之间距离较小的多孔孔板,SST k-ω模型收敛性较好;反之,SST k-ω模型计算结果收敛困难,Standard k-ω+SST k-ω组合模式在保证计算精度的前提下改善了收敛效果.相对于Standard k-ω模型,SST k-ω模型更适合计算多孔孔板流量计的流场,计算结果符合射流理论,能反映出不同多孔孔板流出系数线性度的差异,与实流实验结果的最大误差为4.2%.

Simulation of the Flow Field of Multi-Hole Orifice Flow Meter

In order to calculate the flow field of multi-hole orifice flow meter accurately,Standard k-ω turbulence model,SST（shear-stress transport）k-ω turbulence model and the composite pattern of Standard k-ω and SST k-ω （the calculation result of Standard k-ω as the original value of SST k-ω） were applied to simulate the flow field of three multi-hole orifice flow meters,each with the inside diameter of 100,mm and the equivalent diameter ratioβof 0.6,but with different structures,and the calculation result was analyzed according to the real physical experiment data and theory of jet. The result shows：for the multi-hole orifice with a short distance between the center hole and the holes arrayed on the ring,the convergence of SST k-ω model is better;oppositely,the convergence of SST k-ω model is difficult,and the composite pattern of Standard k-ω and SST k-ω enhance effect of convergence on the premise of calculation accuracy. Relative to Standard k-ω,the SST k-ω model is more accurate and performs better in calculating flow field of multi-hole orifice,the calculation result conforms to the theory of jet and shows the differ-ence of linearity of different multi-hole orifices,and the maximum deviation between calculation result and real physical experiment result is 4.2%.