摘要
为研究管道车作为一种交汇圆柱系式的钝体结构在有压管道流场绕流时,在柱系下游产生的流动分离和尾迹涡现象,运用理论分析与数值模拟相结合的方法,对柱系下游的流场特性进行了研究.数值模拟采用了LES-WALE湍流模型,其结果与物理试验结果比较证明了数值模拟的可行性.对数值模拟结果进行理论分析:首先,由于流动分离柱系后流场中速度分布整体上分为低速流区与高速流区2部分,低速流区主要分布在断面中心位置,高速流区分布在断面外围,呈近似环状分布;其次,流场沿程速度幅值方面,从交汇柱系下游近端断面到远端断面,其中部分低速流区域的整体速度幅值愈高,周围高速流区的速度幅值愈低,并且两区域流场随距交汇柱系距离的增加呈现趋同变化;最后,关于流场的压强特性方面,沿程压强整体呈下降趋势,断面Z 6仅与同流量时管道流场断面平均压强相差3.4%.
In order to study the flow separation phenomenon and wake vortex phenomenon in the downstream of the pipe system when the pipe car was taken as a kind of obtuse cylindrical structure with intersection flow field,the flow field characteristics of the downstream of the pipe system were studied by combining theoretical analysis and numerical simulation.The LES-WALE turbulence model was used in the numerical simulation,and the comparison between the results and the physical test proved the feasibility of the numerical simulation.The numerical simulation results were analyzed theoretically.Firstly,the velocity distribution in the flow field behind the flow separation cross-cylinder system is divided into two parts:the low-velocity flow area and high velocity flow area.The low velocity area is mainly distributed in the center of the section,while the high-speed flow area is distributed in the periphery of the section,showing an approximate circular distribution.Secondly,in terms of velocity amplitude along the flow field,from the proximal section downstream of the cross-cylinder system to the distal section,the higher the overall velocity amplitude of the low-velocity flow area in the middle part,the lower the velocity amplitude of the surrounding high-speed flow area,and the flow fields in the two areas show a convergence change with the increase of the distance from the cross-cylinder system.Finally,in terms of the pressure characteristics of the flow field,the pressure along the flow field shows a downward trend as whole,and the average pressure of the pipeline flow field section at Z 6 is only 3.4%different from that at the same flow rate.
作者
鲁一凡
李永业
赵一名
宋晓腾
强懿鹏
原源
陈润
LU Yifan;LI Yongye;ZHAO Yiming;SONG Xiaoteng;QIANG Yipeng;YUAN Yuan;CHEN Run(College of Water Resource Science and Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)
出处
《排灌机械工程学报》
CSCD
北大核心
2023年第1期44-49,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51109155,51179116)
山西省自然科学基金资助项目(2015011067)。
关键词
交汇柱系
尾迹流场
管道水力输送
有压管道
圆柱绕流
cross-cylinder
wake flow field
hydraulic pipeline transportation
pressurized-pipe
cylinder flow
