太阳能烟囱内非稳态自然对流温度边界层分析  

Analysis of the temperature boundary-layer of unsteady natural convection in a solar chimney

作　　者：何云[1] 苏新武[1] 孙祝[1] 徐永丽[1] 

机构地区：[1]山西大同大学物理与电子科学学院,山西大同037009

出　　处：《山东大学学报（工学版）》2009年第6期150-153,共4页Journal of Shandong University（Engineering Science）

基　　金：山西大同大学校级科研资助项目(2009Q1)

摘　　要：太阳能烟囱内空气流动主要以自然对流边界层流动为主,由于受系统运行控制参数和结构参数的限制,边界层的发展不能象大空间那样自由展开;通过直接数值模拟讨论温度边界层发展的影响因素,结果表明当边界层能够自由展开并且到达稳态时,温度边界层厚度与(y/Ra)^(1/5)满足定量关系;当边界层不能自由展开时,边界层厚度与w,Ra的大小有关.The flow in a solar chimney was dominated by natural convection boundary-layer flow. Because of the restrictions of the operational parameters and the structural parameters, the development of the boundary layer is different from free space. The effects of temperature boundary layer thickness were discussed by direct numerical simulation. The results showed that the boundary layer thickness could meet with certain quantitative relations with （y/Ra）1/5 when the boundary layer can freely develop and reach the steady-state stage, and the boundary layer thickness were relative to w, Ra when the boundary layer could not be freely carried out.

关 键 词：太阳能烟囱 自然对流 直接数值模拟 温度边界层 

分 类 号：TK511.2[动力工程及工程热物理—热能工程]