结合沸腾传热问题,通过凝练并设计实验系统,研究有机工质R245fa在高效蒸发换热管Turbo-EHP管外流动沸腾传热的性能,分析有“孔穴”结构的表面强化管的强化机理。实验中通过改变热源流量、温度以及工质流量等参数,研究其与局部以及平均沸腾换热系数之间的关系。实验结果表明,Turbo-EHP型管前、中、末3段的强化效果不同,在前段气泡热阻对换热性能有一定的影响,中段换热效果达到最优,末段由核态沸腾转为气与壁面的对流换热,换热效果减弱;且随着工质流量的增大,沸腾性能显著增强。 Combining with the problem of boiling heat transfer, the performance of flow boiling heat transfer of organic refrigerant R245fa outside Turbo-EHP tube of high efficiency evaporating heat transfer tube was studied by means of experimenting and designing experimental system, and the strengthening of surface strengthening tube with “hole” structure was analyzed mechanism. In the experiment, the relationship between heat transfer coefficient and local and average boiling heat transfer coefficients was studied by changing parameters such as heat flux, temperature and working fluid flow. The experimental results show that the turbo-EHP-type tube has different enhancement effects in the first, middle and last stages. The thermal resistance of the bubble has a certain influence on the heat transfer performance in the first stage, and the heat transfer efficiency in the middle stage reaches the optimum. For the convection of gas and wall heat transfer, heat transfer effect weakened; and as the working fluid flow increases, the boiling performance was significantly enhanced.