超临界压力航空煤油RP-3在竖直微细管内的对流换热实验

以实验方式对超临界压力RP-3在内径为1.09mm微细管内的对流换热进行了研究，剖析了系统压力、加热热流密度、流动方向及浮升力这些因素对对流换热的影响。实验中热流密度控制为180~460kW/m2，系统进口压力变化范围为3~5MPa，进口雷诺数在3200~10200范围内变化。结果表明:对于向下流动，在实验段入口处浮升力对换热产生了恶化作用，热流密度越大，恶化作用越强；系统压力主要是通过影响流体热物性对对流换热产生影响；不同流动方向对对流换热的影响十分显著，整体上向下流动换热得到强化，向上流动换热得到恶化。 

Experiment on convective heat transfer of aviation keroseneRP-3 in vertical micro-tube at supercritical pressure

Convective heat transfer of supercritical China aviation fuel RP-3 in vertical micro-tube (inner diameter of 1.09mm) was experimentally investigated. Influences of system pressure, heat flux, flow direction and buoyancy on heat transfer were analyzed. Wall heat fluxes (180-460kW/m2), system import pressure (3-5MPa) and inlet Reynolds number (3200-10200) were maintained in experiments. The result showed that the buoyancy force deteriorated the heat transfer of downward flow in the entrance of test section; system pressure affected the convective heat transfer mainly by the impact of fluid thermal properties; effects of different flow directions on convection heat transfer were very significant. Overall heat transfer was strengthened for downward flow and decreased for upward flow.