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不规则表面间的视角系数计算比较复杂,研究者模拟工件在热处理炉内辐射换热时一般将其简化为1。为了分析有无视角系数对工件内部温度场计算的影响,实测了4个圆柱形工件在燃气炉内加热过程的温度分布,并利用ProCAST软件模拟了有无视角系数计算的工件内部温度场。结果表明,计算视角系数得到的温度模拟值与实测值吻合;计算视角系数时,两相邻工件的相互靠近一侧温度偏低,比无视角系数计算的温度低达130℃;沿工件中轴线对称位置的上下表面温差最大约50℃。
The calculation of the viewing angle coefficient between irregular surfaces is quite complicated. When the researchers simulate the workpiece radiation heat transfer in the heat treatment furnace, it is generally reduced to 1. In order to analyze the influence of the viewing angle coefficient on the calculation of the temperature field inside the workpiece, the temperature distributions of 4 cylindrical workpieces in the heating process of the gas furnace were measured. ProCAST software was used to simulate the temperature field inside the workpiece with or without the viewing angle coefficient. The results show that the simulated temperature values obtained by calculating the viewing angle coefficients are in good agreement with the measured values. When calculating the viewing angle coefficients, the temperatures of the two adjacent workpieces near one side are lower than those calculated without the viewing angle coefficient, Symmetrical position of the upper and lower surface temperature difference of about 50 ℃.