径向射流紊动特性分析  

Analysis of turbulent behavior of radial jets

作　　者：李志伟[1] 钱忠东[1] 槐文信[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2009年第6期691-694,705,共5页Engineering Journal of Wuhan University

基　　金：高等学校博士学科点专项科研基金(编号:20070486021)

摘　　要：在应用Realizablek-ε模型对静水环境中径向射流数值模拟的基础上,对其紊动特性进行分析,得到了各种等值线的平面分布图、射流中心线上紊动强度、紊动能及其耗散率的沿程衰减情况,并给出相应的拟合关系式,对各断面的紊动强度、紊动能及其耗散率、雷诺切应力进行分析发现其值在距离出口处一定距离后表现出较强的自相似性,均是从中心向两侧先增大后减小而后达到一个较小的稳定值,与平面射流及圆形射流紊动结构变化规律相似,但它们的最大值均大于后两者的最大值,说明其紊动更加剧烈,对废水有更好的稀释效果.The Realizable k--ε model was used to numerically simulate for radial jets in static ambient. We analyzed its turbulent behavior and got the contours distribution. The distribution of turbulent intensity, turbulent kinetic energy, and turbulent dissipation rate was got along radial direction on the centerline; and the corresponding relationship was given. The turbulent behavior on sections exhibited auto-similar after certain distance from nozzle and the value gradually rose as the distance increased from centerline and then decreased after maximum. These results are similar with plane jets and circle jets, but the maximum is bigger than latter. This conclusion illuminates that the turbulence of radial jets are more intense. There-fore, its dilution in the near field is more effective than others.

关 键 词：紊动结构 紊动能 紊动能耗散率 紊动强度 雷诺切应力 

分 类 号：TV131.4[水利工程—水力学及河流动力学]