计算机数值模拟在指导定向凝固工艺的制订上正起着越来越重要的作用。在定向凝固炉中进行叶片生产，由于炉内是真空环境，所以辐射换热在热量传输过程中占有很大比重。传统的辐射换热计算的重点是角系数的计算，带来计算时间长的问题。针对这种情况，本文提出了改进型Monte Carlo射线追踪法进行辐射换热计算，通过子空间的划分，并结合定向凝固的特点回避了角系数的直接计算，节省了计算时间。把该方法嵌入自行开发的三维模拟软件对柱状晶和单晶叶片的定向凝固过程进行了温度场模拟。并对实际叶片凝固过程进行温度场测试，模拟结果与实测结果吻合比较好。
Numerical simulation has a more and more important effect on improving directional solidification process. Because of the vacuum environment in the furnace where turbine blades are produced, radiative heat transfer plays a significant role in energy transportation. In traditional radiative heat transfer approaches, view factor calculation is a key step, so it takes too much time. Considering this point, Improved Monte Carlo Ray Tracing Approach has been developed. Because this approach combines the space division and the directional solidification features, the view factor calculation is avoided so that the time consuming is greatly shortened.The approach has been embedded in the self-developed software for turbine blade directional solidification temperature simulation. According to the experiments, the simulation results agreed well with the experimental.
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