含圆柱形夹杂金属构件脉冲放电温度场研究

针对含圆柱形非金属夹杂缺陷的金属构件脉冲放电问题,理论导出了圆柱绕流的电流密度分布,进而基于非傅立叶热传导方程求得升温阶段的温度场分布;采用有限元软件建立了含圆柱形非金属夹杂缺陷金属构件的二维有限元模型,从数值角度分析了温度场分布情况:沿通电方向夹杂两侧的温升几乎为零,垂直于通电方向夹杂两侧的温升最大,为2041.499℃。将理论计算与数值分析结果对比可知,两方法所得的温升比分布规律一致,最大温度误差和相对误差分别为17.486℃、3.485%。通过理论、数值两个方面分析验证了电磁热强化对含非金属夹杂缺陷的金属构件性能改善的有效性,为电磁热强化技术的应用奠定了基础。

Research on temperature field of pulse current discharge in metal component with circular inclusion

A temperature field of the pulse current discharge in metal component with circular nonmetallic inclusion is studied in this paper. First, the current density distribution of flow around cylinder is derived. Second, the temperature distribution is obtained based on the non-Fourier heat transfer equation. Third, the two-dimensional finite element model is established using ANSYS. It is shown from studied results that the temperature rise on two sides of the inclusion along the current direction approaches zero, the temperature rise on two sides of the inclusion in the direction perpendicular to the current reaches the maximum temperature rise- 2 041.499 ℃. With the same distribution law of temperature-rise in theoretical and numerical results, the maximal absolute error and maximal relative error is 17.486℃ and 3.485%, respectively. The metal components with inclusion are studied based on the theory and numerical simulation. The research results provide the reference for further study of electromagnetic heating.