通风及内热源参数的方腔内混合对流模拟  

In-cavity mixed convection simulation based on ventilation and internal heat source parameters

作　　者：孙梦楠 宋桂秋[1] 周世华[1] 董祉序 SUN Mengnan;SONG Guiqiu;ZHOU Shihua;DONG Zhixu(School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China;School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China)

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110819 [2]沈阳工业大学机械工程学院,辽宁沈阳110870

出　　处：《哈尔滨工程大学学报》2021年第2期273-279,共7页Journal of Harbin Engineering University

基　　金：国家科技支撑计划(2015BAF07B07);国家自然科学基金青年基金项目(51805075).

摘　　要：为考虑热源形态及通风条件对腔内流体流动及传热性能的影响,本文采用基于多参数弛豫时间模型格子Boltzmann法与有限差分法的耦合算法,对中心热源条件下开口方腔内的混合对流现象进行研究。在不同进、出流口位置和热源形状下,分析了混合对流的流动、温度及换热特性,并给出了流函数线和等温线分布以及热源表面的努赛尔数。数值计算结果明:当进、出流口的位置固定时,热源形状决定了局部对流换热强度,但对温度场的影响较小;平均努赛尔数随着圆角半径R的增大而增大,并在进、出流口分别位于中部和顶部时,取得最大值。To consider the influence of heat source shape and ventilation condition on fluid flow in a cavity and its heat transfer performance,mixed convection in the ventilated square cavity with a central heat-generating element was studied.The coupled algorithm of the multi-relaxation time model lattice Boltzmann method(MRT-LBM)and finite difference method(FDM)were used.Under different positions of inlet and outlet and different shapes of heat source,the flow,temperature,and heat transfer characteristics of mixed convection were analyzed,and the flow line distributions,isotherms,and Nusselt number of the heat-generating surface were given.Simulation results indicated that,when the locations of the inlet and outlet are fixed,the shape of the heat source determines the local convection heat transfer intensity but has little influence on the temperature field;the average Nusselt number increases with increasing radius R,and reaches its maximum value when the inlet is located at the middle and the outlet at the top.

关 键 词：对流换热 混合对流 MRT-LBM FDM 耦合算法 方腔 热源形状 开口位置 

分 类 号：O325[理学—一般力学与力学基础] TK79[理学—力学]