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为降低导光镜面激光辐照区的温度梯度,利用有限体积法求解三维湍流传热方程,得到激光辐照区温度场分布,研究了矩形流道尺寸参数、冷却液的浓度与流速等因素对导光镜面平均温升和温升差的影响,并设计了双流道结构。结果表明,对于单流道,镜面辐照区温度场不随其几何中心呈对称分布,最高温度点位于流道下游;增大流道截面尺寸和冷却液流速可以提高换热效果;流道不同面之间的温度分布并不相同;乙二醇冷却液浓度越高,换热效果越差;相比于单流道结构,双流道结构的平均温升降低幅度最大可达17.79%,温升差降低幅度最大可达67.97%。
In order to reduce the temperature gradient of the laser irradiation zone, the finite volume method was used to solve the three-dimensional turbulent heat transfer equation to obtain the temperature field distribution in the laser irradiation zone. The factors such as the size of the rectangular channel, the concentration of the cooling liquid, Light guide mirror average temperature and temperature difference between the impact of poor, and designed a dual-flow channel structure. The results show that the temperature field in the mirror-free zone is not symmetrical with the geometrical center of the single-channel, and the highest temperature point is located downstream of the channel. Increasing the size of the channel and the flow rate of the coolant can improve the heat transfer effect. The temperature distribution is not the same; the higher the concentration of ethylene glycol cooling fluid, the worse the heat exchange effect; compared with single-channel structure, the maximum temperature drop of double-channel structure can reach 17.79% The largest reduction of up to 67.97%.