方腔内竖直板振荡的自然对流换热数值研究  

Numerical Study on Oscillatory Natural Convection in Enclosure with Vertical Isothermal Plate

作　　者：张晓晖[1] 杨茉[1] 余敏[1] 卢玫[1] 徐之平[1] 章立新[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093

出　　处：《西安交通大学学报》2004年第11期1132-1135,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50276037);上海市教委发展基金资助项目(03GK08);上海市重点学科建设资助项目.

摘　　要：以空调工程热环境控制和冷冻冷藏设备为应用背景,采用非稳态数学模型,通过数值模拟研究了具有对称结构的封闭方腔内竖直板自然对流换热中的非线性现象.数值结果表明:在所考虑的Ra参数范围内,数值解出现了分岔,流动和换热随Ra的增大从稳态转变为非稳态;在Ra为104时采用2种不同的初始条件得到了相同的稳态解;当Ra为5×104时,采用2种不同的初始条件获得了2种不同的解,其中一个是稳态解,另一个是振荡解.数值结果揭示了所研究问题中的非线性特点.The nonlinear characteristics were investigated by numerical simulations for the oscillatory natural convection in an enclosure with a vertical isothermal plate. An unsteady mathematical model for the problem was solved using SIMPLE algorithm with a QUICK scheme. It is shown that the bifurcation of the numerical solutions for this flow and heat transfer occurs in a range of Rayleigh number Ra considered, and the flow and heat transfer change from a steady state to an unsteady with the increase of Ra. Further, the numerical solution obtained is unique and steady using two different initial conditions at Ra=104, while two different numerical results can be obtained using the two different initial conditions at Ra=5×104, one of which is a steady solution and the other is an oscillatory solution.

关 键 词：自然对流 分岔 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]