期刊文献+

导流片对弧度弯管输水性能影响的数值模拟 被引量:1

Numerical Simulation of the Effect of Deflector Sheet on the Water Transmission Performance of Curved Bends
下载PDF
导出
摘要 迪恩涡流及螺旋流作为管路中常见的湍涡结构,虽然具有相似的传热传质等功能,但迪恩涡流易引发管路系统振荡,对有压输水管路系统安全产生巨大威胁。通过前人的物理模型试验建立了管径D=50 mm,曲率半径为2.8 D的弯管管路系统,并根据试验数据验证了数学模型。基于模型管段设计了27种导流片组合用以形成螺旋流,模拟了管内多尺度涡流结构,重点分析了涡流在弯管段及出口直管段的流速、压强和湍动能分布。模拟结果表明:涡流的湍动能及湍流强度对管路系统存在不同程度的影响,弯管管路系统的输水能力在湍动能较大、湍流强度较低的条件下相对较高;螺旋流强度对弯管的输水效率及管路系统的安全性影响显著,当管路进口流速V=1.5 m/s时,弯管管路系统在导流片(个数N=8个、高度H=15 mm、偏转角度θ*=60°)作用下,管路输水效率相对提升10.62%,管路事故风险概率相对降低24.41%。研究成果可为长距离螺旋流输送理论及有压管路系统优化提供技术指导。 Dean vortex and spiral flow are a common turbulent vortex structure in the pipeline.Although the two types of vortex have similar functions such as heat and mass transfer,the Dean vortex is prone to cause pipeline system oscillation,which is a great threat to the safety of pressurized water pipeline system.In this paper,the bend pipe system with pipe diameter D=50 mm and radius of curvature 2.8 D is established by the previous physical model test,and the mathematical model is verified based on the test data.The model pipe section is designed with 27 combinations of guide sheets to form spiral flow,and the multi-scale vortex structure in the pipe is simulated,the flow velocity,pressure and turbulent energy distribution of the vortex in the bend and outlet straight pipe are mainly analyzed.The simulation results show that the pipeline system is affected by the turbulent energy of the vortex and the intensity of the turbulence to varying degrees,the bent pipe system has a higher water transfer capacity under conditions of higher turbulent kinetic energy and lower turbulent intensity.Spiral flow strength has a significant impact on the water transfer efficiency of the bend and the safety of the pipeline system.When the pipe inlet flow velocity V=1.5 m/s,the water transmission efficiency of curved pipe system is increased by 10.62%and the probability of pipeline accident is reduced by 24.41%under the action of guide sheet(number N=8,height H=15 mm,deflection angleθ*=60°).The research results can provide a technical guidance for the long-distance spiral flow conveying theory and pressurized pipeline system optimization.
作者 张晓雷 刘书瑜 郭利霞 吴浩然 ZHANG Xiao-lei;LIU Shu-yu;GUO Li-xia;WU Hao-ran(School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,Henan Province,China;Water Environment Governance and Ecological Restoration Academician Workstation of Henan Province,Zhengzhou 450002,Henan Province,China)
出处 《中国农村水利水电》 北大核心 2023年第6期161-167,共7页 China Rural Water and Hydropower
基金 河南省高等学校重点科研项目计划项目(21B770002) 华北水利水电大学高层次人才科研启动项目(20190906) 引江济淮(河南段)工程科研服务项目三标段(HNYJJH/JS/FWKY-2021003) 广东省水动力学应用研究重点实验室开放研究基金项目(gdsky[2018]003)。
关键词 数值模拟 弧度弯管 迪恩涡流 螺旋流 numerical simulation curved bend dean vortex spiral flow
  • 相关文献

参考文献10

二级参考文献77

共引文献39

同被引文献15

引证文献1

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部