沥青路面热风循环加热机导流板结构参数优化

刘泽源¹，张洪丽^1*，张青梅²，王义清¹

1.山东交通学院工程机械学院，山东 济南  250357；

2.江苏省产业技术研究院道路工程技术与装备研究所，江苏 徐州  221004

摘要：为提高沥青路面热风循环加热效率，以热风循环加热机导流板为研究对象，采用有限差分法和泰勒级数展开法对射流冲击传热问题进行数值求解，建立沥青路面流固耦合传热模型；采用有限元软件FLUENT仿真分析热风射流冲击传热流场，研究导流板内侧倾斜角度（45°、50°、55°、60°、65°、70°）、外侧倾斜角度（30°、35°、40°、45°、50°）对加热效率的影响规律，采用正交试验设计法制定30组试验方案，获得不同内、外侧倾斜角度下沥青路面的温度场分布；计算特定温度目标下热风循环加热时长，确定热风循环加热机导流板的结构参数。结果表明：当内、外侧导流板倾斜角度不变时，加热效率随外、内侧导流板倾斜角度的增大先减小后增大。当内、外侧导流板倾斜角度分别为60°、40°时，热风循环加热沥青路面的加热效率较高。

关键词：热风循环加热；导流板；倾斜角度；流固耦合；加热效率

Optimization of deflector plate structure parameters for hot air circulation heating machine of asphalt pavement

LIU Zeyuan¹, ZHANG Hongli^1*, ZHANG Qingmei², WANG Yiqing¹

1.School of Engineering Machinery, Shandong Jiaotong University, Jinan 250357, China; 2. Road Engineering Technology

and Equipment Research Institute, Jiangsu Industrial Technology Research Institute, Xuzhou 221004, China

Abstract:In order to improve the efficiency of hot air circulation heating for asphalt pavement, this study focuses on the deflector plate in hot air circulation heating machines. Using finite difference method and Taylor series expansion, a numerical solution for jet impingement heat transfer is developed, a fluid-solid coupling heat transfer model for asphalt pavement is established. Finite element software FLUENT is employed to simulate and analyze the heat transfer field of hot air jet impingement, investigate the influence of inner inclination angles (45°, 50°, 55°, 60°, 65°, 70°) and outer inclination angles (30°, 35°, 40°, 45°, 50°) of the deflector plate on heating efficiency. Orthogonal experimental design is used to design 30 sets of experimental schemes. Temperature field distributions of asphalt pavement under different inner and outer inclination angles are obtained. The hot air circulation heating duration for specific temperature targets is calculated and the structural parameters of the deflector plate in hot air circulation heating machines are determined. Results show that when the inner or outer deflector plate inclination angle remains constant, heating efficiency first decreases and then increases as the outer or inner deflector plate inclination angle increase. The higher heating efficiency of hot air circulation heating asphalt pavement is achieved when the inner and outer deflector plate inclination angles are 60° and 40° respectively.

Keywords: hot air circulation heating; deflector plate; inclination angle; fluid-structure coupling; heating efficiency