沥青带材流延工艺冷却过程数值模拟

Numerical simulation of cooling process in asphalt strip casting process

为了探究沥青带材在流延加工时的冷却过程以及优化生产工艺,通过计算流体力学(CFD)数值模拟,将沥青带材的流延加工过程简化成2D高黏度流体与传热过程,建立了多层沥青带材-冷却辊二维模型,并分析了带材厚度、进料位置和辊筒直径对沥青流延工艺传热过程的影响。结果表明:沥青厚度对辊筒冷却段的降温过程影响显著,第一层流延沥青的厚度越小,辊筒对其冷却效果越好,越有利于第二层覆膜;适当前移第一次沥青流延的进料位置,并缩短两次进料的间距,能够改善辊筒的冷却效果;增大冷却辊筒直径可以增加冷却时间,提高冷却效果。

In order to explore the cooling process and optimize the production process of the asphalt strip during the casting process,the casting process of the asphalt strip was simplified into a 2 D high-viscosity fluid and heat transfer process by the computational fluid dynamics(CFD)numerical simulation.A two-dimensional model of multi-layer asphalt strip-cooling roll was established,and the influence of strip thickness,feed position and roll diameter on the heat transfer process of asphalt casting process was analyzed.The results showed that the thickness of asphalt has a significant influence on the cooling process of the roller cooling section.The smaller the thickness of the first layer asphalt is,the better the cooling effect of the roller is,and the more favorable the second layer of membrane is.The cooling effect of roller can be improved by appropriately moving forward the feed position of the first asphalt casting and shortening the distance between the two feeds.Increasing the diameter of the cooling roller can increase the cooling time and improve the cooling effect.