规则波作用下垂直圆管负浮力射流的数值模拟  

Numerical simulation of negative buoyant jet with vertical round under the regular waves

作　　者：尹则高[1,2] 王盛 孙灿 YIN Zegao;WANG Sheng;SUN Can(College of Engineering,Ocean University of China,Qingdao 266100,China;Zhejiang Yugong Information Technology Co.,Ltd,Hangzhou 311265,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100 [2]浙江禹贡信息科技有限公司,浙江杭州311265

出　　处：《水科学进展》2021年第5期780-790,共11页Advances in Water Science

基　　金：国家自然科学基金资助项目(51879251;51579229)。

摘　　要：高密度盐水排放是海水淡化领域一个复杂和常见的物理现象。为研究波浪作用下盐水射流的水动力特性,建立了规则波作用下垂直圆管负浮力射流三维水动力数学模型。利用试验数据对数值计算结果进行验证,两者吻合较好。基于数值计算结果,分析规则波作用下垂直圆管负浮力射流流体扩散特征,研究规则波对负浮力射流三维时均速度以及瞬时浓度的影响。结果发现:入射波波高和周期对射流中轴上量纲一平均垂向速度的衰减指数影响不大,而对衰减系数影响较大;随着波高或波周期的增加,射流特征速度半宽增加,射流中轴上量纲一平均垂向速度的衰减系数减小,有助于射流流体在环境水体中的扩散。另外,建立了考虑浮力效应的波-射流动量比影响的射流中轴上量纲一平均速度衰减系数、平均特征半宽公式,可以为相关实际工程提供一定的参考。High density saltwater discharge occurs frequently and exhibits complex hydrodynamic characteristics during seawater desalination.To study the hydrodynamic characteristics of saltwater jet under wave action,a threedimensional computational fluid dynamics mathematical model of negative buoyant jet with vertical round was developed under regular waves.The model was validated via comparison with the experimental data.The comparison indicated good agreement between the model and experimental data.The diffusion characteristics of negative buoyant jet,the three-dimensional time average velocity,and the instantaneous concentration characteristics were analyzed.The results indicated that the wave height and period contribute slightly to the decay index of the dimensionless average vertical velocity in the jet axis.However,they affect the decay coefficient.An increase in wave height or wave period leads to an increase in velocity half-width,the decay coefficient of dimensionless average vertical velocity on the jet axis decreases.Hence,it contributes to jet diffusion in ambient water.Additionally,the wave to jet momentum ratio is used to conduct the equations of the dimensionless average velocity decay coefficient and the halfwidth of mean characteristic velocity,which can provide some reference for practical engineering applications of the negative buoyant jet.

关 键 词：规则波 负浮力射流 数值模拟 特征速度半宽 波-射流动量比 

分 类 号：TV132.1[水利工程—水力学及河流动力学]