基于最小二乘法和随机逼近的CCM二冷区对流换热系数辨识
Identification of Convection Heat Transfer Coefficient of Secondary Cooling Zone of CCM based on Least Squares Method and Stochastic Approximation Method
摘要：
提出了曲线连铸机钢锭传热传质的详细数学模型。传热传质过程由抛物型非线性偏微分方程描述。相边界的位置由Stefan条件确定。结晶器流道内冷却水的温度用特殊的平衡方程描述。二次冷却区边界条件包括辐射换热和对流换热，并考虑了利用压缩空气和水进行气雾冷却的复杂传热机理。二冷区对流换热系数未知，并视为分布参数。针对这一问题，提出了参数初始平差算法和操作平差算法。
英文摘要：
The detailed mathematical model of heat and mass transfer of steel ingot of curvilinear continuous casting machine is proposed. The process of heat and mass transfer is described by nonlinear partial differential equations of parabolic type. Position of phase boundary is determined by Stefan conditions. The temperature of cooling water in mould channel is described by a special balance equation. Boundary conditions of secondary cooling zone include radiant and convective components of heat exchange and account for the complex mechanism of heat-conducting due to airmist cooling using compressed air and water. Convective heat-transfer coefficient of secondary cooling zone is unknown and considered as distributed parameter. To solve this problem the algorithm of initial adjustment of parameter and the algorithm of operative adjustment are developed.
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