摘要
应用CFD软件研究等腰直角三角形螺旋流道内湍流流体流动特性，计算并对比不同结构参数的数值模型充分发展的湍流流场结构，得出流道内、外壁面的局部阻力系数分布，并分析雷诺数（RP）、曲率及挠率对流体流动阻力的影响．结果表明：等腰直角三角形螺旋流道内湍流流体的二次流为稳定的两涡结构，离心力的作用使外壁面处流体轴向速度梯度远大于内壁面处，因此外壁面的平均阻力系数较大，外壁面的平均阻力系数约为内壁面的1．5—1．7倍．壁面流体平均阻力系数随Re和无量纲曲率的增大而增大，但受挠率影响不大．
With CFD software, the turbulent flow characteristics in helical ducts with right-angled isosce- les triangle cross section were simulated. The velocity fields of fully developed turbulent flow of numerical models with different structure parameters were calculated. The distribution of the local coefficient of re- sistance（fRelc~ ） on outer walls and inner wall was obtained and the effect of curvature ratio, torsion and Reynolds number on the characteristics of the flow resistance was analyzed. The results indicate that the secondary flow structure at turbulent flow in the helical ducts is with two steady vortexes. The velocity gradient near the outer walls is more larger than that near the inner wall due to the effect of centrifugal force ,and the mean flow resistance coefficient（fRem） of the outer walls is about 1.5 - 1.7 times that of the inner wall in the simulate range. The mean flow resistance coefficient on the walls increase with grea- ter value of dimensionless curvature ratio and Reynolds number, whereas the dimensionless torsion has weaker effect on fRem.
出处
《沈阳化工大学学报》
CAS
2016年第1期65-69,共5页
Journal of Shenyang University of Chemical Technology
基金
中央支持地方高校发展专项资金项目(辽财指教[2010]865号)
关键词
螺旋流道
三角形截面
二次流
湍流流动
helical duct
triangle cross section
secondary flow
turbulent flow
