摘要
为了克服传统数值计算方法在进行太阳能跨季节土壤蓄热研究中控制方程复杂、网格数量大和计算耗时长等问题,本文将基于商业软件FLUENT和用户自定义程序,通过Gnielinski公式计算地埋管内壁面的对流换热系数,同时采用热平衡法计算管内流体沿程温度,从而构造地埋管内壁面第三类边界条件,完成太阳能跨季节土壤蓄热简化计算方法的构建。为了验证该方法的优越性,本文分析比较了湍流模型方法与简化计算方法,得出结论如下:与湍流模型方法相比,简化计算方法达到网格无关解所需要的网格量可减少72.4%;简化计算方法的计算误差仅为湍流模型方法的3.7%∼14.2%;简化计算方法的求解效率为湍流模型方法的3.4∼14.7倍。
The traditional method for the simulation of solar energy trans-seasonal soil heat storage system suffers the shortcomings of complex governing equations,large mesh numbers and long computational time.To overcome the shortcomings,an efficient simplified simulation method is proposed in this paper.In this method,the third boundary of inner wall of the buried pipe is defined by obtaining the convective heat transfer coefficient by the Gnielinski formula and the fluid temperature along the pipe by the heat balance method,based on the FLUENT software platform and user-defined functions.In order to verify the superiority of the proposed method,this work compares the turbulence model method with the simplified simulation method.The conclusions are as follows.Comparing with the turbulence model method,the mesh numbers of simplified simulation method required to achieve the grid-independent solution could be reduced by up to 72.4%.The error of simplified simulation method is only 3.7%~14.2%of that of the turbulence model method.The solving speed of simplified simulation method is 3.4~14.7 times that of the turbulence model method.
作者
姚乐恒
卢星宇
孙东亮
杨绪飞
宇波
YAO Leheng;LU Xingyu;SUN Dongliang;YANG Xufei;YU Bo(School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2022年第6期1617-1624,共8页
Journal of Engineering Thermophysics
基金
国家自然科学基金中瑞国际合作与交流项目(No.51961135102)
北京市自然科学基金委员会–北京市教育委员会联合项目(No.KZ2018-10017023)
长城学者培养计划(No.CIT&TCD20180313)。
关键词
太阳能
跨季节蓄热
简化计算方法
湍流模型方法
solar energy
trans-seasonal soil heat storage
simplified simulation method
turbulence model method
作者简介
姚乐恒(1993-),男,硕士研究生,主要从事太阳能跨季节土壤蓄热供暖系统相关研究;通信作者:孙东亮,教授,sundongliang@bipt.edu.cn。
