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为固体激光器设计了一种新型内部结构——扰流柱结构的冷却热沉,采用计算流体力学(CFD)方法对此水冷热沉的三种典型设计方案以及传统的空腔结构和等截面小通道结构热沉分别进行了数值模拟,据此研究了冷却水流量对各种方案的增益介质最高温度、冷却面温度分布以及热沉的压力损失等特性的影响。在相同传热量和相同冷却水流量前提下,等截面小通道热沉和扰流柱热沉的传热特性都明显优于空腔结构热沉。与等截面小通道水冷热沉相比较,扰流柱热沉传热热阻更小,而流动压力损失较大。数值模拟结果表明扰流柱热沉传热性能优于传统的两种热沉(空腔结构和等截面小通道结构)设计方案,具有更好的冷却效果。在较高流量下工作时,扰流柱热沉传热性能略优于等截面小通道热沉,在较低流量下工作时则显著优于等截面小通道热沉。
A new type of internal structure for the solid state laser is designed, ie, the cooling heat sink of the spoiler structure. Three typical design schemes of the water-cooled heat sink, as well as the traditional cavity structure and isosceles section, are calculated by computational fluid dynamics (CFD) The effects of the cooling water flow on the maximum gain medium temperature, the temperature distribution of the cooling surface and the pressure loss of the heat sink were studied. Under the same heat transfer and the same cooling water flow rate, the heat transfer characteristics of the cross section small channel heat sink and the spoiler heat sink are obviously better than that of the cavity heat sink. Compared with the equal-channel small-channel water-cooled heat sink, the heat transfer resistance of the spoiler heat sink is smaller and the flow pressure loss is larger. The numerical simulation results show that the heat transfer performance of the spoiler heat sink is better than that of the traditional two heat sinks (cavity structure and cross-sectional small-channel structure), which has a better cooling effect. When operating at higher flow rates, the heat transfer performance of the spoiler heat sink is slightly better than that of the islet cross-section small channel heat sink, and it is significantly better than the cross-section small channel heat sink when working at lower flow rates.