【摘要】 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%.更多还原

【Abstract】 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 ratio β of 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 difference of linearity of different multi-hole orifices,and the maximum deviation between calculation result and real physical experiment result is 4.2%.更多还原