倾斜侧壁约束下的垂向紊动射流数值模拟  

Numerical Simulation of Vertical Turbulent Jet Restrained by Slanted Sidewall

作　　者：兰庆琳 丁全林[1] 周玲玲[1] 

机构地区：[1]河海大学力学与材料学院,江苏南京210098

出　　处：《水电能源科学》2014年第10期91-94,共4页Water Resources and Power

摘　　要：为研究倾斜侧壁约束下垂向紊动射流与周围水体的掺混稀释特性,基于标准κ-ε紊流模型,采用VOF方法处理自由表面,对不同侧壁倾斜角度和入射流速下紊动射流进行数值模拟,分析了射流轴线速度衰减、左右侧扩展半宽及平均浓度等变化,并通过射流横断面最大速度和最大浓度分别确定射流的轨迹线。结果表明,倾斜侧壁约束下射流轴线速度衰减较自由射流衰减缓慢,射流两侧扩展半宽均减小,且侧壁倾斜一侧平均浓度要高于另一侧。侧壁倾斜条件下射流卷吸环境水体的能力有所抑制,不利于污水的扩散稀释。For the study of the mixing dilution feature of vertical turbulent jet with the surrounding water restrained by slanted sidewall, the standard κ-ε turbulence model and VOF method which is applied to track the free surface are adopted to simulate two-dimensional vertical turbulent jet in static shallow waters in different angle of sidewall and velocity in entrance port. Variation of axis velocity attenuation and left and right side extension half width and mean concentration of jet has been studied. And then the jet trajectory by maximum velocity and maximum concentration of cross section of jet has been confirmed. The results show that restrained by slanted sidewall the jet axis velocity decay slowing down compared with free jet, left and right side of jet extension half width also shrink; the average concentration in the side of sidewall inclined is higher than the other side; jet entrainment environment＇s ability is curbed under the condition of the side wall inclination, which is not conducive to the spread of the sewage dilution.

关 键 词：紊动射流 标准κ-ε紊流模型 侧壁倾斜 VOF方法 

分 类 号：TV131.2[水利工程—水力学及河流动力学] O358[理学—流体力学]