摘要
通过Fluent软件,采用六面体网格,标准k-epsilon模型,对90°弯曲管道内湍流流动进行数值模拟。讨论了Re数分别为200、1 000、5×103、10×103、50×103、100×103,管弯曲度为1.0、1.5、2.5、3.5时,对压力损失和二次流的影响。结果表明,当Re=50×103时,总的流动阻力损失在R/D≈2.5时达到最小;阻力系数Cp在流动处于湍流范围时降至2以下,更高Re数下的阻力系数在0.4~0.7之间,与已有研究结果相符;随着R/D的增大,内外侧静压差逐渐变小,圆心角Θ为45°处内外侧壁面静压差大于Θ为0°和90°时;管内流动状态对弯管内流体内外侧压力分布有着显著影响;二次流强度随R/D减小和Re数的增大而增加。
Turbulent flow simulation of 90°bending tube was studied by Fluent,and the hexahedral mesh,standard k-epsilon model were taken in the process of simulation.We discussed effect of pressure loss and secondary flow with different Re value and tube curvation.The result showed when Re=50×103,R/D is about 2.5,the total fluid resistance losses got the least.With R/D increasing,the static pressure difference of internal and external tube getting smaller,the static pressure difference ofΘ=45°is larger thanΘ=0°orΘ=180°.The turbulent flow in tube has significant effect to the static pressure difference of internal and external tube.And the secondary flow strength increased with decreasing R/D and increasing Re value.
作者
秦明坤
李强
王建普
QIN Mingkun;LI Qiang;WANG Jianpu(Heze Tainuo environmental technology Co.,Ltd;Heze environmental ecology bureau Dingtao Branch Bureau,Heze,Shandong 274100)
出处
《化工生产与技术》
CAS
2020年第1期11-14,17,I0002,I0003,共7页
Chemical Production and Technology
关键词
弯曲管道
湍流
二次流
数值模拟
bend tubes
turbulence
secondary flow
simulation
