不同冷却工况下90°带肋通道中蒸汽的强化换热特性研究  

Heat Transfer Intensification of Steam for the Cooling Process in 90° Rib Rectangular Channels

作　　者：税琳棋[1] 高建民[1] 刘加增[1] 徐亮[1] 史晓军[1] 

机构地区：[1]西安交通大学机械制造系统工程国家重点实验室,西安710049

出　　处：《西安交通大学学报》2012年第9期6-11,共6页Journal of Xi'an Jiaotong University

基　　金：国家重点基础研究发展计划资助项目(2007CB707701)

摘　　要：在蒸汽强化换热试验研究的基础上,采用SSG雷诺应力模型,通过数值方法求解了三维定常雷诺时均Navier-Stokes方程,同时系统地分析了雷诺数、温度和压力对蒸汽在90°矩形带肋通道中流动和换热的影响.结果表明:温度和压力的变化强烈地影响着带肋通道中蒸汽的强化换热特性,蒸汽的摩擦因子和换热系数随着温度的升高而减小,随着压力的升高而增大,在适中的Re、较低的蒸汽温度和中等压力下,蒸汽流动可以获得最佳的强化换热性能;蒸汽和空气的换热系数比与温度和压力有关,但与Re无关.On the basis of the experimental study on the steam forced heat transfer, the SSG turbulence model was adopted to solve the three-dimensional steady Reynolds-averaged Navier- Stokes equations. The numerical investigation was performed on the influence of Reynolds numbers （Re）, temperature and pressure on the steam flow and heat transfer process in a 90° ribbed rectangular channel. The results show that the variations of temperature and pressure significantly affect the steam forced heat transfer characteristics. The steam heat transfer coefficient and friction factor will increase with an increase in pressure and decrease with an increase in temperature. Generally, the optimum steam thermal enhancement performance can be achieved for the steam flow at the suitable Re number, relative low temperature and medium pressure. The change in Re number has little effect on the performance of steam cooling.

关 键 词：试验研究 数值方法 强化换热 蒸汽 带肋通道 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]