机械科学与技术2017，Vol.36Issue(10)：1491-1497,7.DOI:10.13433/j.cnki.1003-8728.2017.1003
雷诺数和半径比对90°圆弧弯管流动特性的数值研究
Numerically Studying Effects of Reynolds Number and Radius Ratio on Flow Characteristics of 90° Arc Bend Pipe
李静 1杨俊红 1黄涛 2韩奎 2高琳1
作者信息
- 1. 天津大学中低温热能高效利用教育部重点实验室,天津300072
- 2. 西安市长安区新区热力有限公司,西安710100
- 折叠
摘要
Abstract
The flow under different Reynolds number Re and different radius ratio Rc/D in 90° arc bend pipe was simulated with the numerical RNG k-ε turbulence model in the software FLUENT.The velocity distribution,pressure distribution and the secondary vortex flow inside the bend pipe were analyzed.The local drag coefficient,the effects of the length of local drag on 72 working conditions with different Reynolds numbers Re (1×104 ≤Re≤1×106) and different radius ratios Rc/D (0.6≤Rc/D≤2) were analyzed.It is found that Re is constant,the local drag coefficient is reduced when Rc/D increases.Rc/D is constant;Re≤6×105;the local drag coefficient decreases quickly when Re increases;Re ≥-6×105;the local drag coefficient change with that of Re is very small.Re is constant;the greater Rc/D,the shorter the length of local drag influence.The effect of the length of local drag influence on the increase of Re is reduced and then reaches a constant value;the less Rc/D,the more delay,the longer it takes for the local drag coefficient to reach a constant value.关键词
90°弯管/雷诺数/半径比/局部阻力系数/影响长度/数值模拟Key words
turbulence model/pressure distribution/vortex flow/reynolds number/local drag coefficient/numerical method分类
建筑与水利引用本文复制引用
李静,杨俊红,黄涛,韩奎,高琳..雷诺数和半径比对90°圆弧弯管流动特性的数值研究[J].机械科学与技术,2017,36(10):1491-1497,7.
