锥形渐扩管内逆压梯度紊流场的数值仿真

Numerical Simulation of Turbulence Having Adverse Pressure Gradient in a Conical Diffuser

用DLR(近壁低雷诺数)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,研究不同数值入流边界条件对计算结果的影响以及整个流场主要流动参数的分布特性。

Fully developed incompressible sticky turbulent flow in a conical diffuser having a total divergence of 8° and an area ratio of 4 has been simulated by a k-ε model for near-wall and low-Re-number and its Boundary-Fit curvilinear Coordinate Transformation method.The research has been done under different numerical entering boundary conditions.The influence of the different numerical entering boundary conditions on computational results has been gotten by comparing with experimental date.The parameter distributions of the whole flow area have been given respectively.