湿式弦栅丝绕流传热介观模型推导与数值仿真  

Mesoscopic model derivation and numerical simulation of heat flow around wet string grid wire

作　　者：黄敏华 王海桥 陈世强 朱辉[2] 韩巧云 刘东 HUANG Minhua;WANG Haiqiao;CHEN Shiqiang;ZHU Hui;HAN Qiaoyun;LIU Dong(School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China;Department of Building Environment and Energy Engineering,Guilin University of Aerospace Technology,Guilin 541004,Guangxi,China;Guangxi Longma Expressway Co.,Ltd.,Nanning 530025,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]桂林航天工业学院能源与建筑环境学院,广西桂林541004 [3]广西龙马高速公路有限公司,南宁530025

出　　处：《安全与环境学报》2024年第3期1010-1017,共8页Journal of Safety and Environment

基　　金：国家自然科学基金项目(42202321);湖南省自然科学基金项目(2022JJ30251);中华人民共和国交通运输部交通运输行业重点科技项目清单(2021-MS5-126);广西交通运输行业重点科技项目清单(桂交便函[2021]148号)。

摘　　要：将隧道施工过程中产生的污风进行净化消热处理,对施工隧道环境控制具有重要意义。为了找到热流体穿越湿式弦栅丝的流动换热规律,采用格子玻尔兹曼方法,建立低雷诺数下的圆柱绕流传热介观模型,进一步结合已有关联式验证模型的准确性;基于上述模型,考察雷诺数Re=200的条件下串列圆柱绕流流场与温度场分布;量化不同间距比L/D下流场与温度场的结构演化,分析换热特征参数努塞尔数Nu与间距比和换热时间的关系,揭示流场结构对温度场的影响。结果表明:流场与温度场的分布规律具有一致性,不同L/D下流场与温度场呈现不同特征,L/D较小时,上下游圆柱之间形成流动死区,换热效果差,随着L/D的增大,下游圆柱对上游圆柱流场的抑制作用减弱,尾流中出现旋涡,流动死区被打破,冷热流体掺混增强;存在临界间距比L/D=2.65,超出这一临界间距时,下游圆柱时均Nu始终大于上游圆柱,且当L/D=4时,上下游圆柱时均Nu趋于稳定,在具体工程应用中,应使间距比L/D≥4。It is significant to control the tunnel construction environment to purify and cool the air.To find the general law of heat transfer of hot fluid flowing through wet string grid wire,the lattice Boltzmann method was used to establish a mesoscopic model of heat transfer around a cylinder at a low Reynolds number,and the accuracy of the model was further verified by combining the existing correlation formula.Based on the above model,the flow field and temperature field distribution around a series cylinder with Re=200 was investigated.The flow field and temperature field structure evolution with different spacing ratios L/D was quantified.The relationship between the heat transfer characteristic parameter Nu and spacing ratio and heat transfer time was analyzed to reveal the influence of flow field structure on the flow field structure of the temperature field.The results show that:the distribution law of the flow and temperature fields is consistent,and different L/D flow fields and temperature fields show different characteristics.When the L/D value is small,a dead flow zone is formed between the upstream and downstream cylinders,resulting in a poor heat transfer effect.With increasing L/D value,the downstream cylinder's inhibition effect on the upstream cylinder's flow field is weakened,vortices appear in the wake,the dead flow zone is broken,and the mixing of hot and cold fluids is enhanced.There is a critical spacing ratio of L/D=2.65;beyond this critical spacing,the average Nu of the downstream cylinder is always greater than that of the upstream cylinder.When L/D=4,the average Nu of the upstream cylinder tends to be stable.In practical engineering applications,the spacing ratio L/D≥4.

关 键 词：安全卫生工程技术 湿式弦栅 绕流传热 介观模型 温度场 间距比 

分 类 号：X948[环境科学与工程—安全科学]