相向对撞壁面射流分区及扩展数值模拟  

Numerical Simulation of the Regional Division and Expansion of Opposed Wall Jet

作　　者：袁浩[1] 梁浩然 谢春航 胡瑞昌 YUAN Hao;LIANG Hao-ran;XIE Chun-hang;HU Rui-chang(Southwest Water Conservancy and Water Transport Engineering Research Institute,Chongqing Jiaotong University,Chongqing 400074,China;College of River and Ocean Engineering,Chongqing JiaotongUniversity,Chongqing 400010,China)

机构地区：[1]重庆交通大学西南水利水运工程科学研究院,重庆400074 [2]重庆交通大学河海学院,重庆400010

出　　处：《长江科学院院报》2024年第11期102-108,共7页Journal of Changjiang River Scientific Research Institute

基　　金：重庆市自然科学基金项目(cstc2021jcyj-msxmX1175);重庆交通大学校内科学基金课题(F1220084)。

摘　　要：为了揭示相向对撞壁面射流中径向和垂向射流特性,采用RNG k-ε模型对相向对撞壁面射流进行三维精细模拟,分析相向对撞射流产生的径向射流、垂向射流的分区结构和扩展率,探讨初始雷诺数和喷嘴间距对射流扩展率的影响。结果表明,径向射流和垂向射流分区结构类似,但流场中形成的径向和垂向漩涡影响范围不同。射流初始雷诺数对径向射流扩展率影响不明显,喷嘴间距对径向和垂向射流的扩展率影响明显,且喷嘴间距越大,径向射流和垂向射流的扩展率越大。此外,喷嘴间距对射流发育过程有一定影响,喷嘴间距越小,射流到达最大速度点所需时间越短、射流发育过程越快。In order to reveal the characteristics of radial and vertical jets in the opposite wall jet,renormalization group k-εmodel is adopted to simulate complex three-dimensional opposed jet.The partition structure and expansion rate of radial and vertical jets are analyzed.The influences of initial Reynolds number and nozzle distance on jet expansion rate are discussed.The results show that radial jet and vertical jet have similar regional division,however,vortices in different directions formed in the flow field have different influence ranges.The initial Reynolds number has no obvious effect on the expansion rate of the radial jet.The nozzle distance has a significant effect on the expansion rates of radial and vertical jets.The larger the nozzle distance is,the larger the expansion rates of the radial and vertical jets are.Meanwhile,the nozzle distance has a certain influence on the jet development.Near nozzle spacing shortens the time for jet to reach the maximum velocity point,and speeds up the development process.

关 键 词：相向射流 壁面射流 射流分区 射流扩展 

分 类 号：O352[理学—流体力学]