碟片激光器晶体模块阵列射流冲击冷却的研究

摘要

In order to analyze the core factor of cooling effect of jet array impingement unit of disk -laser crystal module , the effect of apertures , hole-to-hole spacing and nozzle-to-plate spacing on jet array impingement cooling was analyzed by numerical calculation under certain total area of each nozzle .Heat transfer coefficient was analyzed comparatively by experiment .The cooling effect was verified in actual disk laser .The results show that nozzle B of hole aperture 0.6mm and hole-to-hole spacing 1.6mm has the highest heat transfer coefficient .Heat transfer coefficient can reach 55000W· m-2 · K-1 at water flow rate of 3L/min and nozzle-to-plate spacing of 3mm.There is optimum value of nozzle-to-plate spacing at different inlet pressures .The optimum value of nozzle-to-plate spacing of nozzle B is 0.5mm at inlet pressure of 0.2MPa.Verification experiment on actual disk-laser shows that the cooling temperature of nozzle B declines 5℃ lower than of nozzle C, at water flow rate of 6.5L/min, nozzle-to-plate spacing of 5mm and current of 200A.The conclusion provides a reference for the design and the optimization of jet impingement cooling unit of thin-disk laser crystal module .%为了研究影响碟片激光器晶体模块射流冲击冷却单元换热效果的核心因素，采用数值计算的方法，在喷孔总面积一定的条件下对孔径、孔间距及喷射距离进行了冲击冷却的分析，通过实验对换热系数进行了对比分析，并在实际的碟片激光器上对降温效果进行了验证。结果表明，孔径为0．6mm且孔间距为1．6mm的喷嘴B具有最好的换热效果，在3L／min的流量及3mm的喷射距离下，换热系数达到55000W· m－2· K－1；不同泵压下，存在最佳喷射距离，喷嘴B在0．2MPa时，最佳喷射距离为0．5mm；当流量为6．5L／min、喷射距离为5mm及注入电流为200A时，喷嘴B对碟片晶体的冷却温度比喷嘴C低5℃。此结论为碟片激光器晶体模块射流冲击冷却单元的优化设计提供了参考。