彭燕祥,张华,吴国华.三维挑流水舌及其碰撞的LBM数值模拟研究[J].中国水利水电科学研究院学报,2022,20(2):129-136
三维挑流水舌及其碰撞的LBM数值模拟研究
Numerical simulation of water jet and collision based on LBM
投稿时间:2021-01-08  修订日期:2021-11-17
DOI:10.13244/j.cnki.jiwhr.20210007
中文关键词:  挑流水舌  水舌风  格子Boltzmann  涡量  水舌碰撞  微射流
英文关键词:jet flow  nappe wind  Boltzmann method  vorticity  jet collision  micro jet
基金项目:国家重点研发计划项目(2016YFC0401704);国家自然科学基金项目(51579100)
作者单位E-mail
彭燕祥 华北电力大学 水利与水电工程学院, 北京 102206 zhanghua@ncepu.edu.cn 
张华 华北电力大学 水利与水电工程学院, 北京 102206  
吴国华 华北电力大学 水利与水电工程学院, 北京 102206  
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中文摘要:
      为了研究挑流水舌空中掺气破碎以及水舌碰撞形成的复杂两相流运动,采用格子玻尔兹曼方法对泄洪过程中的挑流水舌以及两股水舌的碰撞进行数值模拟研究。研究表明:(1)格子Boltzmann方法能够对挑流掺气水舌进行数值模拟,得到掺气水舌的运动界面以及水舌风的空间分布。水舌内缘挑距、外缘挑距以及横向宽度与文献中实测数据对比误差分别为9.6%、7.9%、7.1%;(2)水舌的上下表面的涡量远远高于内部水舌,这也是水舌掺气的重要影响因素,随着水舌的掺气量不断变大,涡量向内部输运,在水舌的末端涡量达到最大;(3)水舌碰撞的数值模拟与文献中实验条件下水舌运动形态基本一致,水舌在碰撞后形成一个锥形的射流形态,并且在碰撞区域形成一股反向微射流。
英文摘要:
      In order to study the complicated two-phase flow caused by aerated breakup and collision, lattice Boltzmann method was used to simulate the impact of jet and two jets in the process of flood discharge. The results show that (1) the lattice Boltzmann method can be used to simulate the water jet,and the moving interface of aerated jet and the spatial distribution of nappe wind are obtained. Compared with the experimental data, the errors of inner edge, outer edge and transverse width are 9.6% , 7.9% and 7.1% respectively. (2) The vorticity of the upper and lower surfaces of the water jet is much higher than that of the internal jet, which is also an important factor affecting the air entrainment of the jet. With the increasing air volume of the jet, the vorticity is transported to the interior, and the vorticity reaches the maximum at the end of the water jet. (3) The numerical simulation of water jet collision is basically consistent with the experimental conditions. After the collision, the water jet forms a conical jet shape and forms a reverse micro jet in the collision area.
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