液态合金有效热扩散率DFP反算方法

DFP Inverse Method of Effective Thermal Diffusivity of Liquid Alloy

以铝合金熔液为例进行液态合金有效热扩散率的测试和计算方法研究。采用数值计算和DFP优化技术 ,通过对待测液态合金有效热扩散率的优化计算使铸件凝固温度场计算结果与实测温度场趋于一致 ,最终获得该合金液的有效热扩散率随温度变化的规律。

This paper discusses the measuring and computing methods about effective thermal diffusivity of liquid alloy by taking liquid aluminum alloy for example. By the self-regulating and optimized computing the effective thermal diffusivity using numerical simulation and DFP optimization method, the simulation result of solidification temperature field is made accordant with the measured temperature, thereby the formulae expressing the effective thermal diffusivity being changed with the temperature are finally obtained. Detailed flow charts are also presented for the Inverse method in this paper.