方形空间内混合对流换热的数值研究

NUMERICAL SIMULATION OF MIXED CONVECTION HEAT TRANSFER IN A RECTANGLE CAVITY

以建筑物内人工环境控制为应用背景，对有对称空气射流的方形空间内混合对流换热进行了数值模拟，探讨了这种具有对称结构的混合对流换热解的分岔问题。数值结果表明，Ｒｅｙｎｏｌｄｓ数、强制通风气流的射流角度、以及方形空间的宽高比都会影响解的分岔。当Ｒｅ数超过某一临界值时，会出现非对称数值解。宽高比减小，出现非对称解的临界Ｒｅ数也随之减小。Ｒｅ数、宽高比一定，仅当通风气流的射流角度在某个范围内时，能够得到非对称的数值解。

A mixed convection heat transfer in a rectangle cavity with symmetrical air jets is cal- culated numerically to investigate the bifurcation of mixed convection with this symmetrical configuration, the background of which is the control of environment in a building. Numerical results show that the bifurcation can be affected by Reynolds number and the angle of jet and the ratio of width to height of the rectangle cavity. When Reynolds number is over a critical value, an unsymmetrical numerical solution will appear and the critical Reynolds number will cut down along with a decrease in the ratio of the width to height. When Reynolds number and the ratio of the width to height are fixed, unsymmetrical numerical solutions will be obtained at a value range of the jet angle.