螺旋弯管内流动与传热特性的数值模拟  

Numerical simulation of flow and heat transfer characteristics in helical pipe

作　　者：冯璐璐 徐让书[1] 冯建宇 FENG Lulu;XU Rangshu;FENG Jianyu(Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aircraft Propulsion Systems,Shenyang Aerospace University,Shenyang,Liaoning 110136,China)

机构地区：[1]沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室,辽宁沈阳110136

出　　处：《排灌机械工程学报》2020年第7期697-701,共5页Journal of Drainage and Irrigation Machinery Engineering

摘　　要：针对螺旋弯管内的流动与传热特性,以螺旋弯管传热试验中试验件模型为研究对象,基于Realizable k-ε湍流模型、第一类热边界条件下的薄壁热阻模型,对不同进口来流条件下,采用Fluent对螺旋弯管内水的流动与换热进行数值模拟.计算得到了螺旋弯管内速度场与温度场的分布,通过数值模拟结果与试验结果的比较,验证了数值模拟方法的正确性.结果表明:随着进口来流雷诺数的增大,螺旋弯管内的二次流迪恩涡核心向弯管管壁扩张;在螺旋弯管小曲率比、来流雷诺数2 280~6 000内,螺旋弯管的强化换热综合性能最佳;对模拟结果数据利用多元线性回归法,推导出螺旋弯管内换热努赛尔数、进出口压力降的准则关系式.研究结果可为螺旋管式换热器设计与优化提供一定的参考依据.Aiming at fluid flow and heat transfer characteristics in helical pipes,an experimental model of helical pipe was selected as the study object.The flow and heat transfer of water in the pipe was numerically simulated by using Fluent,based on the realizable k-εturbulence model and thin-wall thermal resistance model along with first kind thermal boundary condition.The velocity and temperature fields in the pipe were obtained at different water flow rates.In addition,the correctness of the numerical simulation method was validated by comparison with the experimental results.With increase of Reynolds number,the core of Dean vortex in the secondary flow in the pipe expands to the wall of the pipe.The comprehensive heat transfer properties in the pipe are the best in a small curvature ratio and at Reynolds number ranged in 2280-6000.The correlations of convective heat transfer and pressure drop were established by using multilinear regression model based on the simulated data.It can provide a certain reference for design and optimization of helical-coiled heat exchangers.

关 键 词：螺旋弯管 迪恩涡 强化换热 努赛尔数 压力降 

分 类 号：S277.9[农业科学—农业水土工程]