半导体激光器非典型宏通道水冷散热系统设计

针对大功率半导体激光器散热系统展开设计研究。首先，对水冷散热系统的流体通道中的冷却液进行了流体分析，结果表明在传统矩形流体通道结构中，冷却液在进液口处和弯度较小处容易产生湍流空洞。湍流空洞不仅会产生空泡腐蚀效应，还会导致靠近热源的上层冷却液填充不充分，降低系统的散热效率；其次，在传统流体通道结构的基础上，提出了一种非典型宏通道结构的优化模型。采用有限元分析软件Fluent分别对散热模型的分布和激光器模块器件的分布进行了数值模拟，流场结果表明优化模型中冷却液流动时没有湍流空洞产生，散热系统可靠性更高，冷却液在流体通道的上层填充效果更好，同时解决了传统模型中流体在局部流道中流速缓慢的问题，使散热系统具备更良好的散热性能。接着又通过温度场仿真结果得出，优化模型搭建的散热系统工作时激光器最高温度可降低2 ℃，且热源1上温度更均匀，热源3上温度降低1.25 ℃；最后，在激光器满功率输出情况下进行的散热实验对比，获得的实验数据与仿真结果基本一致。

Design of atypical macro-channel water cooling system for semiconductor lasers

Comprehensive study on the cooling system of high-power semiconductor laser was carried out. Firstly, fluid analysis of the coolant in the channels of the cooling system was conducted, and the corresponding results showed that turbulent cavities were formed easily at the inlet and places with small comprehensive study on the cooling system of high-power semiconductor laser was carried out. Firstly, fluid analysis of the coolant in the channels of the cooling system was conducted, and the corresponding results showed that turbulent cavities were formed easily at the inlet and places with small curvatures. Turbulent cavities may not only cause the cavitation corrosion effect, but also cause the upper fluid channel near the heat source was not fully filled with coolant. In addition, turbulent cavities will also reduce the heat dissipation efficiency of the cooling system; Secondly, based on the traditional fluid channel structure, an optimized atypical macro-channel structure was proposed. The distribution of the heat dissipation model and the distribution of the laser module components were numerically simulated using Fluent that the finite element analysis software. The simulation results showed that no turbulence cavities were generated when the coolant flows in the fluid channel of the optimized model, and the upper layer of the fluid channel can be better filled with coolant. Simultaneously, the optimized model solved the problem of slow fluid velocity in the localized area of fluid channel of the classical model, not only improved the heat dissipation performance of the cooling system, but also improved the reliability of the cooling system. Additionally, according to the temperature field simulation results, the highest working temperature of the laser was decreased by 2 ℃ when applying the optimized cooling system. And the temperature on heat source-1 was more uniformly-distributed, while the temperature on heat source-3 was reduced by 1.25 ℃; Finally, the cooling system experiments were carried out and the results were well-matched with our simulation results.