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分别建立了喷雾冷却和平面凝固铸造的二维计算模型.根据对1070铝合金方锭末端冷却所测得的温度数据,反求出不同水压下冷却面表面温度与换热系数的变化规律,并将其作为边界条件导入平面凝固铸造的计算模型进行可靠性验证.结果表明:界面换热系数随冷却面温度的降低先升高后降低,在400K左右达到峰值.随着冷却水压的增加,换热系数的峰值和峰值对应的温度值也相应增大.铸造实验测温结果表明:所用平面凝固装置可实现凝固前沿宏观上呈平面上升,且凝固过程中铸锭各处冷却均匀;与数学模型计算结果吻合良好,说明该模型可用于平面凝固铸造工艺方案的研究.
The two-dimensional calculation models of spray cooling and plane solidification casting are respectively established.Based on the measured temperature data of the end cooling of 1070 aluminum alloy ingot, the variation law of surface temperature and heat transfer coefficient under different water pressure is obtained, The results show that the interfacial heat transfer coefficient firstly increases and then decreases with the decrease of the cooling surface temperature and reaches the peak at about 400 K. With the increase of cooling water pressure , The corresponding peak value and peak temperature of the heat transfer coefficient also increased correspondingly.The results of the casting experiment showed that the plane solidification device used in the experiment can achieve a macroscopically flat rising at the front of the solidification and cool the ingot evenly throughout the solidification process. The results of mathematical model agree well with each other, which shows that the model can be used in the research of plane solidification casting process.