本文首先递推求解目标表面各点的瞬时温度；

First, this paper calculates the temperatures of every point on the surface of target at each time.

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基于三维有限元模型，计算了喷管的瞬时温度场。

Based on three-dimension finite element model, transient temperature field in nozzle was calculated.

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大型铸钢件中瞬时温度场的控制问题便可归结为上述问题。

The control problem of the instantaneous temperature field on Large-scale casing steel can be reduced to above problem.

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