关键词: 再生冷却;航空煤油;超临界;拟沸腾;传热恶化

Abstract: In order to research the regenerative cooling performance of endothermic fuel in new vehicles， the pseudo-boiling heat transfer characteristics of super- and near-critical （p=3MPa） aviation kerosene RP-3 in an electrically heated small circular tube （Internal diameter D=1.6mm） were experimentally investigated at the operating conditions with heat fluxes of 0.1~1.0MW/m² and mass fluxes of 500~1000kg/（m²·s）. It found that a phenomenon of pseudo subcooled cooling boiling heat transfer occurred at super- and near-critical pressure conditions. But the wall temperature behaviors and heat transfer deterioration appearances in the process of pseudo-boiling have some differences from those at the subcritical pressure boiling conditions. The heat transfer characteristics of supercritical pressure aviation kerosene can be divided into three regions， including the liquid-like forced convection heat transfer， pseudo subcooled boiling heat transfer and gas-like forced convection heat transfer. During pseudo-boiling the wall temperature and heat transfer coefficient slowly increased with the increasing fluid temperature， and the heat transfer enhancement occurred. In the pseudo-critical temperature region， a heat transfer reduction existed with a minimum heat transfer coefficient value in the heat transfer curve. While the fuel temperature was above the pseudo-critical temperature， the fuel was at the supercritical gas-like condition and the heat transfer was greatly strengthened.

Key words: Regenerative cooling;Aviation kerosene;Supercritical;Pseudo-boiling;Heat transfer deterioration