Investigation of Heat Transfer and Coking Characteristics of Hydrocarbon Fuels

In this paper, worldwide investigations of the cooling characteristics of hydrocarbon fuels are reviewed and results of Chinese experimental investigations are presented. The Chinese tests were conducted at pressures of 0.5 ‐30 MPa, e ow velocities of 2 ‐106 m/s, and heat e uxes up to 66 MW/m 2 . The heat transfer characteristics of methane, propane, no. 21 high-density kerosene, aerokerosene and rocket kerosene in stainless-steel and copper tubes, and the deposit formation rates for kerosene in stainless-steel tubes were investigated. Forced convective heat transfer correlations were obtained for liquid methane, propane, and kerosene. Heat e uxes at which test tubes burnt out were also investigated. The test results indicate that heat transfer coefe cients of methane and propane decrease at high wall temperatures, and that the coefe cients of kerosene increase at similar conditions because of boiling. No coking was detected in methane tests; coking temperature and coking rates were determined for kerosene in stainless-steel tubes.