作　　者： ; ; ; ;

机构地区： 上海理工大学能源与动力工程学院

出　　处： 《上海理工大学学报》 2010年第6期525-529,共5页

摘　　要： 运用FLUENT软件中的RNGk-ε模型对不同Re下圆形截面90°弯管内空气流动进行了模拟,分析了管内压力分布、二次流动和壁面上压力系数的变化,研究了Re不同时对壁面压力系数的影响.发现在气流进入弯管段后,流场由于流体惯性和分子黏性的相互作用,各个截面上出现了对称的二次流涡对.随Re增大,流体对于管道壁面的压力增大,管内压力损失也在增大.管道壁面上的压力系数随Re的不同差别不大,Re越大,压力系数越小,并且管道外壁面变化比内壁面更加明显.湍流时压力系数沿程变化比层流明显很多,曲率的影响也要强于层流. The flow under different Re number in 90° bend pipe was simulated numerically by the RNG k-ε turbulent model in software FLUENT,and the pressure distribution inside the tube,the secondary flow and the change of wall pressure coefficient were analyzed.The affect of low Re number on the flow structure and characteristics was investigated emphatically.It is found that the secondary flow occurs at the pipe section of the flow due to fluid inertia and molecular viscosity.With increasing Re number,the fluid pressure on the pipe wall and the pressure loss increase.Pressure coefficient on the pipe wall will appear in a few difference under different Re number.When Re number is greater,the pressure coefficient will be smaller,and on the pipe outer wall change more obviously than on the inner wall surface.When the flow is turbulent,the pressure coefficient along flow changes more significantly than when it is laminar flow,and the curvature also has a stronger affection on the flow.

关 键 词： 弯管 模型 二次流 压力系数

领　　域： [理学] [理学]