冲击射流二次生成涡的大涡模拟研究  

Large eddy simulation of secondary eddy for impinging jet

作　　者：于明州[1] 陈丽华[1] 邵雪明[1] 

机构地区：[1]浙江大学机械与能源工程学院,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2006年第9期1624-1628,共5页Journal of Zhejiang University：Engineering Science

基　　金：浙江省自然科学基金资助项目(J20040028)

摘　　要：为揭示冲击射流大涡拟序结构的变化规律,研究了冲击射流壁面二次生成涡卷起及与壁面分离的演化特性.采用Smagorinsky提出的亚网格尺度模型,得出了壁面二次生成涡结构变化与冲击高度、雷诺数和喷嘴宽度的关系.数值模拟结果表明,雷诺数对壁面二次生成涡的卷起位置影响较小,但是壁面二次生成涡与壁面的分离位置却有随雷诺数增大而外移的趋势.随着冲击高度的增加,二次生成涡卷起及与壁面分离位置距离滞止点的位移也相应的增加.当冲击高度与喷嘴宽度的比值取值相同时,喷嘴宽度的大小对壁面二次生成涡的演变特性基本上没有影响.To study the changing principle of large eddy coherent structures in the impinging jet flow, the evolution characteristics of the secondary eddy rolling up and separating from the impingement plate was obtained. By adopting sub-grid scale models proposed by Smagorinsky, the influences of the nozzle width, impact height and Reynolds number on the structure changing of the secondary eddy were investigated. The results indicate that the variety of the Reynolds number has negligible effect on the rolling position of the secondary eddy, but that the separating position of the secondary eddy from the impinging plate moves away from the stagnation point with increasing Reynolds number. The distances away from the stagnation point of the secondary eddies rolling and separating from the impingement plate increase with increasing impact height. When the ratio of impact height to the nozzle width does not change, the nozzle width has negligible influence on the evolvement of secondary eddy.

关 键 词：二次生成涡 冲击射流 大涡模拟 

分 类 号：O357[理学—流体力学]