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对抽运及冷却中发生的流动、对流扩散及瞬态热传导等现象的耦合作用过程,用多物理场耦合分析方法,建立了计算激光晶体温度分布的流-热-固耦合模型。应用有限单元法,对受高功率重复脉冲抽运的片状激光晶体进行瞬态温度场数值模拟。排除了不精确的换热系数对计算结果的影响,并为评价流速、流道形状等因素对冷却效果的影响,从而为改进冷却方式降低激光晶体的热效应提供了可靠的分析方法。
Coupling process of flow, convection and diffusion and transient heat conduction occurred in pumping and cooling processes, a coupled flow-heat-solid model for calculating the temperature distribution of laser crystal was established by multi-physics coupled analysis method. The finite element method is used to simulate the transient temperature field of sheet laser crystal with high power and repetitive pulse pumping. The influence of inaccurate heat transfer coefficient on the calculation results is excluded. In order to evaluate the influence of flow velocity, flow channel shape and other factors on the cooling effect, a reliable analytical method is provided to improve the cooling effect and reduce the thermal effect of the laser crystal.