以蒸馏水为冷却循环工质设计了一套封闭式喷雾冷却换热实验测试装置,探究了进口压力和系统压力对光滑表面进行喷雾冷却换热特性的影响.结果表明:当喷嘴进口压力增大时,液滴的出口速度和液滴数密度增大,喷雾冷却换热能力增强,表面平均温度也同时降低;此外,与常压喷雾冷却系统相比,保持热源功率不变,降低系统压力时,系统的热流密度和换热系数都有较大幅度提升,而表面平均温度则大幅下降,且表面温度不均匀性得到明显改善,系统压力从101 kPa下降为10 kPa时,表面最大温差从12.8 ℃降低到5.7 ℃.%The effects of spray pressure and system pressure on spray cooling heat transfer characteristics of smooth surfaces were studied in a closed experimental apparatus with distilled water. The results show that with the increase of the inlet pressure, the velocity and the density of droplet outlet increase, the heat transfer performance of spray cooling is enhanced and the average surface temperature is reduced. In addition, reducing the system pressure at a constant heating power, the heat flux and the heat transfer coefficient show a significant improvement and the mean surface temperature decreases obviously. The non-uniformity of surface temperature is improved compared with atmospheric spray cooling system. When the system pressure drops from 101 kPa to 10 kPa, the maximum temperature difference of the surface decreases from 12.8 ℃ to 5.7 ℃.
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