可变背压下连续喷雾和脉冲喷雾实验研究

Experimental Study of Continuous Spray and Pulse Spray under Variable Back Pressure

设计了一套可变背压的喷雾冷却实验系统,研究了流量、入口温度、低压环境和脉冲喷雾在喷雾冷却中的换热性能。研究结果表明:流量在8 L/h^17 L/h范围内,换热性能随着流量的加大而增强;入口温度为25℃时,换热性能最好;环境压力越低,换热性能越好;常压下热流密度<200 W/cm^2时,脉冲喷雾的换热系数小于连续喷雾,当热流密度>200 W/cm^2时,脉冲喷雾的换热系数大于连续喷雾。

In this paper,a spray cooling experiment system with variable back pressure is designed.The results show that the heat transfer performance increases with the increase of flow rate within the range of 8 L/h^17 L/h.When the inlet temperature is 25℃,the heat transfer performance is the best.The lower the ambient pressure is,the better the heat transfer performance is.If the heat flux density is less than 200 W/cm2 at atmospheric pressure,the heat transfer coefficient of the pulse spray is less than that of the continuous spray.If the heat flux density is greater than 200 W/cm2,the heat transfer coefficient of the pulse spray is greater than that of the continuous spray.