摘要
分析了圆截面弯管内部流动规律。将大涡模拟与基于特征线的分离算法相结合,在雷诺数Re=6×104下,对弯曲段中心线量纲一曲率半径为1的90°圆截面弯管流动进行有限元数值模拟,研究入流角对二次流、分离、偏流及流动阻力的影响,入流角度的范围为-16°至16°。结果表明:负入流角会削弱二次流强度,但增强了偏流度和弯管内的流动分离;正入流角的效果相反。与二次流相比,偏流是造成弯管损失的更重要因素。弯管损失在正入流角下具有极小值。
The internal flow characteristics in a pipe bend were analyzed using a large-eddy simulation combined with the characteristic-based spliting scheme to investigate the effect of inflow angle on the flow in a circular cross-section pipe with a 90° bend,a dimensionless curvature-radius of 1.0,inflow angles from -16° to 16° and a Reynolds number of 6×104.The effect of the inflow angle on secondary flow,separation,primary flow deviation,and bend losses were analyzed.The results show that negative inflow angles attenuate the secondary flow intensity,while increasing the primary flow deviation intensity and flow separation.The primary flow deviation more strongly affects the bend losses than the secondary flow.The bend losses are minimized with a positive inflow angle.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第12期1971-1975,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(50776052)
国家“八六三”高技术项目(2008AA05Z201)
关键词
大涡模拟
有限元法
入流角
弯管流动
圆截面
偏流
弯管损失
large-eddy simulation
finite element model
inflow angle
bend flow
circular cross-section
pipe bend loss
