侧壁射流对突扩通道流动特性的影响  

Effect of a side-wall jet on the flow in a sudden-expansion channel

作　　者：程勇[1] 汪军[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093

出　　处：《上海理工大学学报》2004年第3期202-206,共5页Journal of University of Shanghai For Science and Technology

基　　金：上海市重点学科建设资助项目(能源岛关键技术及基地建设)

摘　　要：讨论了垂直于突扩通道主流方向的侧壁射流对壁面压力系数、传热系数及主回流区长度的影响.采用标准k ε双方程湍流模型,对侧壁射流突扩通道中的流场进行了数值模拟,计算结果表明,侧壁射流位置越靠近入口,主回流区长度越短,最大压力系数位置前移,其数值增大,局部表面传热系数也增大.根据计算结果,拟合出了当侧壁射流速度与突扩通道入口平均流速之比等于2.0时,主回流区长度与侧壁射流位置的关系式.The effects of a side wall vertical jet on sudden-expansion channel's wall pressure coefficient,surface heat transfer coefficient and main flow recirculation zone length are discussed in detail.A numerical simulation is made for flow in a sudden-expansion channel with a side vertical jet,where the standard k-ε model is used in computation.The numerical calculation shows that the more a side wall jet is near to the sudden-expansion channel inlet,the shorter the main flow recirculation zone length will be,while the position of maximum pressure coefficient will move upward,and the maximum value of pressure coefficient and the local surface heat transfer coefficient will be increased.According to the modeling result,the correlations between the main recirculation zone length and the position of side wall jet are obtained at the ratio of side wall jet velocity/sudden-expansion inlet velocity being equal to 2.0.

关 键 词：回流 回流区长度 压力系数 突扩 传热系数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]