隧道式加热炉热流场模拟分析

Simulating Analysis on Heat and Flow Fields in Tunnel Stove

根据炉体结构为细长形以及多段重复的特点,对隧道式加热炉热风进气口和导流板导流孔截面进行等效处理,建立了工作截面的二维模型;根据加热工艺过程中恒温时段较长的特点,采用了稳态流场和温度场的模型;利用流体力学软件FLUENT对实际生产中彩色显像管在隧道式加热炉内加工时的炉内热流场分布情况进行了分析,获得了流速场和温度场;其中流速场与根据等效结构制作的流体图案模型获得的流体图案相吻合;所得到的温度场的个别特征点温度与实际测量结果相符,指出大幅度的温度波动是导致玻壳经常爆裂的主要原因。

According to the slightness-characteristics of stove and repeating-part of the same unit, the import of hot gas and flow-holes of guiding plates were treated as the equivalents so that the work-section of stove could be simulated as a 2-D model. Due to the longtime constant temperature in the producing technics, steady flow-field were adopted. The CFD code FLUENT was used to simulate the distribution of hot-flow when the color-kinescopes were put in the stove . The velocity and temperature field were given matching with the ones in a test model built for the equivalents. Temperature at the given points agrees with the measurement data well. The great undulate of temperature is the main reason for the crack of the tube.