大功率激光器喷雾冷却中无沸腾区换热性能实验研究  

Experiment Study on Non-Boiling Heat Transfer Performance Spray Cooling for High-Power Laser

作　　者：王亚青[1] 刘明侯[1] 刘东[1] 徐侃[1] 

机构地区：[1]中国科学技术大学热科学与能源工程系,安微合肥230027

出　　处：《中国激光》2009年第8期1973-1978,共6页Chinese Journal of Lasers

摘　　要：以水为冷却介质,采用雾化角60°的Steinen系列1.5和2.0实心圆锥喷嘴,研究不同流量(3.26～5.0 L/h)时大功率激光器喷雾冷却中的换热性能。结果表明,喷雾冷却"无沸腾"区换热性能不能简单以流量大小来衡量:对于同种型号喷嘴,压力、流量增大会导致换热性能增强;但对不同型号的喷嘴,增大压力与流量不能明显增强换热能力。在液滴喷射速度变化不大时,由于流量增加会引起液滴数通量、液滴粒径大小、液膜厚度等喷雾参数的变化,这些参数共同影响着换热。冷却效率主要受液体流量和液滴喷射速度共同影响。对于同种型号喷嘴,压力增强冷却效率下降。相对于光滑表面,粗糙换热面在喷雾冷却"无沸腾"区有着更好的换热性能和冷却效率。Using water as coolant, Steinen 1.5,2.0 full-cone nozzles with spray cone angle 60° were applied to study heat transfer performance of spray cooling for high-power laser in non-boiling regime when mass flow rates ranged from 3.26 L/h to 5.0 L/h. The results indicate that heat transfer can not be judged by mass flow rates only. For the same nozzle, the increasing of pressure and mass flow rates resulte in the increasing of heat trarsfer performance. For different nozzles, the heat transfer performance doesn＇t increase obvirously, if droplet velocity is not varied significantly, increased mass flow rates can change other spray parameters such as droplet flux, droplet size and film thickness, and all the parameters determine spray heat transfer performance together. Mass flow rates and droplet velocity are the key parameters to influence cooling efficiency. For the same nozzle, enhanced pressure could result in cooling efficiency drop. Compared with smooth wall, the rough wall has better heat transfer performance and cooling efficiency in non-boiling region.

关 键 词：激光器 喷雾冷却 无沸腾区 冷却效率 

分 类 号：TK124[动力工程及工程热物理—工程热物理]