流体机械2017，Vol.45Issue(3)：33-37,5.DOI:10.3969/j.issn.1005-0329.2017.03.007
细小直角弯管流道的压力损失及迪恩涡特性
Pressure Loss and Characteristics of Dean Vortices in Small Right-angle Bend Flow Channel
摘要
Abstract
The 3D numerical simulation was carried out on the field in a small right-angle bend flow channel of 2 mm diameter in the swirl atomizing nozzle using RNG k-ε model,so as to obtian the pressure distribution and dean vortices structure in different cross sections in the flow channel.The results show that along the flow direction,the pressure difference between the inside and the outside increases first and then decreases in bending section.The pressure drops to the lowest near the 45 ° section of the inside internal wall where the biggest drop is 74.1%.Dean vortices form near 10 ° section of the bending section.And the rotational centers of the dean vortices move from the centers of both side to the above,the migration directions turn at 65 ° section,finally return to the side near the center positions.At the same time the boundary and intensity of the dean vortices first increase then decrease,until disappear in the downstream straight pipe.关键词
细小直角弯管流道/压力损失/压力分布/迪恩涡Key words
small right-angle bend flow channel/pressure loss/pressure distribution/dean vortices分类
机械制造引用本文复制引用
汪建兴,王海民,饶玲..细小直角弯管流道的压力损失及迪恩涡特性[J].流体机械,2017,45(3):33-37,5.基金项目
上海市科委科研计划项目(13DZ2260900) （13DZ2260900）
2014年度上海市军民结合专项项目计划(26) （26）
