圆形腔体内热杆件轴向同心移动湍流换热模拟

Numerical Study on Turbulent Flow and Heat Transfer in Circular Cavity with Moving Inner Hot Rod

摘要:

提出利用稳态方程求解长杆状发热物体在圆形腔体内做轴向运动时产生湍流对流和传热问题,可以节约计算成本.对3种工况进行了数值模拟,得到整个计算域的流场与温度场.模拟的结果与经典经验公式基本吻合.对比了3种工况条件下发热物体壁面局部努塞尔数、壁面局部温度以及发热物体前后端附近空气的温度分布,发现当圆环流与物体移动逆向时有强化散热作用,而当圆环流与物体移动同向时散热效果变差.

Abstract:

Problems of turbulent flow and heat transfer in concentric annuli with moving inner hot rod are solved by the proposed steady equation method,and cost of computation is,therefore,cut down.Simulation is made to achieve the flow field and temperature field of whole computation area,which is approximate to what is achieved by classical experience equation.Partial wall Nu and wall temperature of hot rod as well as air temperature distribution near rod front and bottom are compared in three work conditions.Results indicate that enhanced heat release effect takes on when annuli flow has the reverse direction of rod,however when flow having the same moving direction,effect weaken.