【摘要】 用DLR型k-ε紊流模型.BFC(边界拟合曲线坐标变换)法,对总扩散角为8°,扩散度为4的锥形渐扩管内充分发展的不可压粘性紊流进行数值仿真.应用实例的入口雷诺数分别为1.16×105和2.93×105.在不同的模型常数和网格布局下进行数值仿真,给出14种算例的时均速度-u和紊流动能k分布的计算结果,并分别将其与实验结果进行比较,分析不同计算条件对计算结果的影响程度,计算结果与实验结果较好符合.更多还原

【Abstract】 Fully developed incompressible turbulent flow in a conical diffuser having a total divergence of 8° and an area ratio of 4 has been simulated by a DLR k-ε turbulence model and its BFC(Boundary Fit Coordinates) method.The research has been done for pipe entry Reynolds numbers of 1.16×105 and 2.93×105.The calculated results of the distri bution of the mean flow velocity and turbulence energy of 14 cases have been given under the different calculating conditions,such as model constances and grid disposition.They were compared with the experimental results respectively.We obtain the effects of calculated result on the different calculating conditions by analysing.The calculated results agree well with the experimental results.更多还原