滑梯形滚塑模具表面温度均匀性的数值研究

摘要

Uniformity of surface temperature of slide-shaped moulds inside cylindrical ovens for rotational molding was studied theoretically by numerical simulation with the aid of a Fluent? software.The energy conservation principle was adopted to obtain the analytical solution of average air temperature inside the oven.By comparing the numerical solution with the analytical one,the theoretical model of heat transfer and method of numerical computation were proved to be correct.The effects of the temperature and velocity of incoming air flow and the circumferential locations of inlets and outlets at the oven on the uniformity of surface temperature of slide-shaped mould were also investigated.The results indicated that the uniformity of surface temperature became worse with an increase of the temperature of incoming air flow,and however it could be improved by increasing the speed of incoming air flow.Furthermore,the uniformity of surface temperature could also be improved by making the circumferential locations of inlets and outlets more close to the horizontal boundary lines between the upper and lower half of the cylindrical oven wall.%采用数值模拟的方法通过Fluent软件对圆筒形滚塑烘箱内滑梯形模具的表面温度分布的均匀性进行了理论研究.利用能量守恒原理得到了烘箱内部空气平均温度的分析解,通过将数值仿真结果与其相比较,证明了传热理论模型和数值计算方法的准确性;分别研究了烘箱的进风温度、进风速度以及烘箱进风口和回风口的周向位置对滑梯形模具表面温度均匀性的影响.结果表明,提高进风温度将使模具表面温度分布的均匀性变差,而增大进风速度可以改善模具表面温度分布的均匀性;让进风口和回风口的周向位置更靠近烘箱上、下半圆筒的水平分界线,也可以改善温度分布的均匀性.