QQ客服 官方微博 反馈留言

	水跃流自由面掺气过程数值仿真研究
	向敏 ; 屠基元 ; 张为华 ; XIANG Min ; TU Ji-Yuan ; ZHANG Wei-Hua
	2016-03-30 ; 2016-03-30
关键词	水跃流 自由面掺气 双流体模型 群体平衡 Gabbros South Lancangjiang belt Zircon U-Pb dating Early Permian subduction of the Changning-Menglian Ocean TV135.21
其他题名	Numerical Simulation on Air Entrainment in Hydraulic Jump Flows
中文摘要	本文基于欧拉-欧拉双流体模型,并耦合亚网格自由面掺气模型建立了水跃流多尺度数值仿真模型,对水跃流形成过程中相互耦合的大尺度气液界面形成、自由面掺气和气泡流扩散等过程开展仿真研究。得到了自由面掺气形成的不同区域气含量、气泡频率和气泡尺寸等参数分布,研究表明在剪切层区域存在最大气含量和最高气泡频率点。由于高气含量加剧气泡聚合,最大频率位置更靠近底面。沿轴向方向,湍流强度逐渐降低,而气含量逐渐减小使不同位置上气泡直径变化较小。本文数值模型为成功预示水跃引起的多相多区域流场提供了较为有效的方法。; A multiscale numerical model,which was coupled with the MUltiple-SIze-Group(MUSIG)model and a sub-grid air entrainment model,has been established for the hydraulic jump flows based on the Euler-Euler two-fluid model.Simulations were carried out for the coupled processes including the formation of macroscale gas-liquid interface,free-surface air entrainment and bubble dispersion in hydraulic jump flows,obtaining the void fraction,bubble frequency and bubble size distributions in different regions.It was observed that both the maximum void fraction point and the maximum bubble frequency point exist in the shear layer region.Because that high void fraction enhanced bubble coalescence,the maximum bubble frequency point was closer to the bottom surface.Due to the opposite effect of decreasing void fraction and decreasing turbulence intensity,the average bubble size in the characteristic points almost maintain constant along the axial direction.The current proposed numerical model will be able to provide a useful methodology in predicting multiphase and multi-region flow field created by hydraulic jump.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/143986]
专题	清华大学
推荐引用方式 GB/T 7714	向敏,屠基元,张为华,等. 水跃流自由面掺气过程数值仿真研究[J],2016, 2016.
APA	向敏,屠基元,张为华,XIANG Min,TU Ji-Yuan,&ZHANG Wei-Hua.(2016).水跃流自由面掺气过程数值仿真研究..
MLA	向敏,et al."水跃流自由面掺气过程数值仿真研究".(2016).

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。