朝下针翅结构表面稳态临界沸腾换热实验研究

Steady-state Experimental Study of Critical Boiling Heat Transfer on Downward Facing Surface with Pin-fin Coating Structure

针对商用压水堆核电站堆内熔融物滞留(IVR)策略对提高压力容器外表面沸腾换热临界热流密度(CHF)的迫切需求,本文采用冷喷涂技术在铜基体表面制备了一种由针翅凸起结构与多孔涂层相结合的毫米-微米双尺度结构表面,运用稳态池沸腾实验研究了铜光表面和针翅涂层结构表面在朝下不同倾角下的沸腾换热性能。结果表明:朝下表面的CHF随倾角的增加而增大,与铜光表面相比,针翅涂层结构表面CHF至少提高了63%,具有较好的工程应用前景。

Enhancing the critical heat flux(CHF)of boiling heat transfer to achieve in-vessel retention(IVR)strategy has become an urgent requirement of commercial PWR nuclear power plants’security.A new kind of millimeter-micro multi-scale structure surface was fabricated on the surface of copper substrates by cold spraying technology,which combined pin-fin structures with porous coating structures.Steady-state pool boiling experiment was conducted on a plain copper surface and the pin-fin coating structure surface under different inclination angles.The experimental results show that the CHF increases with the inclination angles on downward facing surface,compared with the plain surface,the pin-fin coating structure enhances the CHF more than 63%,which testifies its superior engineering application prospects.