沥青路面微波现场热再生传热模型研究  

Research on Heat Transfer Model of Asphalt Pavements Subjected to Microwave Heating Recycling

作　　者：朱松青[1] 史金飞[2] 姜来东[1] 伍斌[1] 

机构地区：[1]徐州师范大学电气工程及自动化学院,江苏徐州221116 [2]东南大学机械工程学院,江苏南京211189

出　　处：《公路交通科技》2009年第2期32-36,共5页Journal of Highway and Transportation Research and Development

基　　金：江苏省科技成果转化资金资助项目(BA2006068)

摘　　要：为了研究沥青路面微波加热再生过程中的温度场分布,根据傅里叶传热学理论建立了二维微波热再生传热数学模型;用角锥喇叭口面场近似辐射场,研究了微波内热源;建立边界条件并进行了归一化处理。基于控制容积的有限差分法(CV-BDM)建立了微分方程的隐式离散格式并进行了数值模拟;选用了工业频率2.45 GHz的微波试验系统,采用连续加热工艺和间歇加热工艺,研究在沥青路面内二维温度场中温度随加热时间的变化特性。结果表明微波加热时温度上升是非线性的,在加热初期升温较慢,后期升温较快;沥青混合料内温度分布是不均匀的,其口面中心区域附近温度较高,而边缘处温度较低。当采用间歇加热工艺时,可有效提高沥青混合料受热均匀性,必须合理选择加热时间。数值模拟和试验取得了较好的一致性。In order to assess temperature field in microwave heating for recycling asphalt pavements, a 2D mathematic heat transfer model was developed based on Fourier heat transfer theory. The microwave internal heatgeneration was researched by using surface field of pyramidal horn replacing approximate radiation field. In addition, the boundary conditions were built and normalization processing was implemented. The control volume based finite differential method （CV-BDM） was used to establish the implicit discrete scheme of the conservation equations, and the numerical value simulation was employed. By continuous or intermittent radiation heating technique, a microwave heating experimental system at 2.45 GHz was carried out to investigate temperature variation characteristics of asphalt pavements along with heating time. The result shows that （ 1 ） the increase of temperature of asphalt mixture during microwave heating is obviously nonlinear, the temperature rises slowly in the initial stage of the heating but increases rapidly in the late heating period; （2） the temperature distribution is non-uniform that the temperature in central area of the surface is higher while it is lower on edge; （3） the uniformity of temperature within asphalt mixtures can be improved by using intermittent heating technique, and the heating time must be reasonable. The simulation results are in preferable agreement with the experiment.

关 键 词：道路工程 沥青路面 微波热再生 传热模型 数值模拟 

分 类 号：U418.6[交通运输工程—道路与铁道工程]