热风加热沥青路面冲击射流共轭传热特性  

Conjugate heat-transfer characteristics of impinging jet for hot air heating asphalt pavement

作　　者：徐信芯[1,2] 刘道成 郑江溢 蔡万智 顾海荣 张辉[1] XU Xinxin;LIU Daocheng;ZHENG Jiangyi;CAI Wanzhi;GU Hairong;ZHANG Hui(National Engineering Research Center of Highway Maintenance Equipment,Chang an University,Xi an 710064,China;Henan Key Laboratory of High·grade Highway Detection and Maintenance Technology,Xinxiang 453003,Henan,China)

机构地区：[1]长安大学公路养护装备国家工程研究中心,西安710064 [2]河南省高等级公路检测与养护技术重点实验室,河南新乡453003

出　　处：《哈尔滨工业大学学报》2024年第4期148-157,共10页Journal of Harbin Institute of Technology

基　　金：中央高校基本科研业务基金项目(300102252104);陕西省创新能力支撑计划项目(2022PT-30);河南省杰出外籍科学家工作室项目(GZS2022004);安徽省工程机械智能制造重点实验室开放课题基金(IMCMMCM2021KF02)。

摘　　要：为提高热风加热沥青路面的就地再生加热效果,基于热风冲击射流对流换热和沥青路面内部导热的共轭传热过程,建立了热风加热沥青路面的冲击射流共轭传热理论模型,选取有限容积法得到了共轭传热模型的通用离散方程,采用压力-速度耦合半隐式算法(semi-implicit method for pressure linked equations,SIMPLE)获得了整个求解域内温度场分布,选取平均热流密度和平均换热系数反映沥青路面加热效果,通过正交试验研究了热风出口速度和热风出口温度对路面加热效果的影响程度。仿真和试验结果表明:理论计算与实验温度场分布趋势吻合度高,两者平均误差为8.4%;平均热流密度和平均换热系数在加热初期均从最大值急剧下降,而后下降幅度逐渐减小趋于平衡,两者的仿真计算与实验结果趋势相同,平均误差分别为6.4%和7.8%;热风出口速度和热风出口温度对平均热流密度均有显著影响,热风出口速度对平均换热系数有显著影响,热风出口温度对平均换热系数的影响相较于平均热流密度指标表现为不显著。研究结果为后续沥青路面就地热再生热风加热温度控制和加热器设计提供了理论依据。To improve the heating effect of hot air heating on asphalt pavement during hot in-place recycling(HIR),the hot-air impinging jet convective heat transfer and the heat conduction were regarded as conjugate heat-transfer process,and a theoretical model of conjugate heat-transfer for impinging jet for hot air heating asphalt pavement was established.Based on the finite volume method,the general discrete equation of conjugate heat-transfer model was presented.The temperature field distribution in the whole solution domain was obtained by using the pressure/velocity coupled semi-implicit algorithm(SIMPLE).The average heat flux and average heat-transfer coefficient were selected to reflect the heating effect on the asphalt pavement.The influence degree of hot-air outlet velocity and hot-air outlet temperature on heating effect was studied by orthogonal experiments.The simulation and experimental results show that there is a high degree of agreement between the theoretical calculation and the experiment temperature distribution,with an average error of 8.4%.Both average heat flux and average heat-transfer coefficient decrease sharply from the maximum value at the beginning of heating,and then gradually decrease to equilibrium.The simulation and the experiment of both average heat flux and average heat-transfer coefficient have the same trend,and the average errors are 6.4% and 7.8%,respectively.Both the velocity and the temperature of hot-air outlet have a significant effect on the average heat flux,while the hot-air outlet velocity has a significant effect on the average heat-transfer coefficient.However,the influence of hot-air outlet temperature on the average heat-transfer coefficient is relatively insignificant compared to the average heat flux.The research results provide a theoretical basis for temperature control and the design of hot-air heating equipment during HIR.

关 键 词：就地热再生 冲击射流 热风出口速度 热风出口温度 平均热流密度 平均换热系数 

分 类 号：TG156[金属学及工艺—热处理]