横流环境下振荡射流三维数值模拟  

Three-dimensional numerical simulation of oscillating jet in cross flow environment

作　　者：李蒙 徐振山[1] 陈永平[1] LI Meng;XU Zhenshan;CHEN Yongping(College of Harbor,Costal and Offshore Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2022年第2期54-60,共7页Journal of Hohai University(Natural Sciences)

摘　　要：采用大涡数学模型对横流环境下正弦振荡射流进行三维模拟,重点分析了横流环境下非振荡射流与振荡射流运动特性和稀释规律的差异,并探讨了振荡参数对射流的影响。结果表明:横流环境下振荡射流形态与非振荡射流区别明显,其运动轨迹发生弯曲,呈现出明显的间歇性污染物云团现象;与非振荡射流相比,振荡射流的冲击高度与弯曲程度明显增加,与周围水体的掺混加剧;随着振荡幅度的增加,射流的冲击高度与最小稀释度增大;总体来看,横流环境下,振荡射流有利于污染物的稀释。The large eddy simulation model is used to simulate the three-dimensional sinusoidal oscillating jet in the cross flow environment.The differences of motion characteristics and dilution law between the non-oscillating jet and the oscillating jet in the cross flow environment were analyzed,and the influence of oscillating parameters of the jet was discussed.The results show that the shape of oscillating jet is obviously different from that of non-oscillating jet in the cross flow environment,and its trajectory is bent,showing an obvious“intermittent effluent cloud”phenomenon.Compared with the non-oscillating jet,the impact height and bending degree of the oscillating jet are significantly increased,and the mixing with surrounding water is intensified.With the increase of oscillating amplitude,the impact height and minimum dilution of the jet increase.In general,the oscillating jet is beneficial to the dilution of pollutants in the cross flow environment.

关 键 词：横流环境 振荡射流 数值模拟 稀释规律 

分 类 号：TV132.1[水利工程—水力学及河流动力学]