加热滚筒参数对沥青混合料加热效率影响的仿真分析

Simulation analysis on the influence of heating roller parameters on asphalt mixture heating efficiency

为了提高沥青混合料的加热效率,降低能源消耗,建立沥青混合料加热滚筒三维分析模型,基于传热学原理和流体力学原理,采用有限容积法对沥青混合料的加热过程进行数值模拟。得到了沥青混合料温度场分布以及混合料的温度变化曲线,并分析了沥青路面养护车加热滚筒结构参数和滚筒转速对沥青混合料加热时间的影响。研究结果表明:螺旋叶片高度、螺旋叶片螺旋角对沥青混合料的加热效率有一定的影响,合理的叶片结构可以更好地促进冷热沥青混合料之间的混合传热,提高加热效率;加热滚筒转速对沥青混合料的加热效率影响较大,转速过慢混合料混合传热不均匀,转速过快滚筒壁面温度较低,混合料温升较慢。

To improve the heating efficiency of asphalt mixture and reduce energy consumption,the 3Danalysis model of asphalt mixture heating roller was established.Based on the principles of heat transfer and fluid mechanics,the finite volume method was used to simulate the heating process of asphalt mixture.The distribution of temperature field and temperature curves of asphalt mixture were obtained.The influence of heating roller parameters and the different roller speeds of asphalt road maintainer on heating time of asphalt mixture was analyzed.The results show that the height and helix angle of blade has certain influence on the heating efficiency of asphalt efficiency.Reasonable blade structure can improve heat transfer between hot and cold asphalt mixture and improve heating efficiency.Roller speed has considerable influence on heatingefficiency of asphalt mixture.Heat transfer of mixture is uneven under the low roller speed.Temperature of asphalt mixture rises slowly because of the lower roller wall temperature under the high roller speed.