Numerical Investigation on Supercritical Heat Transfer of RP3 Kerosene Flowing inside a Cooling Channel of Scramjet

Abstract

Supercritical convective heat transfer characteristics of hydrocarbon fuel play a fundamental role in the active cooling technology of scramjet. In this paper, a 2D-axisymmetric numerical study of supercritical heat transfer of RP3 flowing inside the cooling channels of scramjet has been conducted. The main thermophysical properties of RP3, including density, specific heat, and thermal conductivity, are obtained from experimental data, while viscosity is evaluated from a commercial code with a ten-species surrogate. Effects of heat flux, mass flow rate, and inlet temperature on supercritical heat transfer processes have been investigated. Results indicate that when the wall temperature rises above the pseudocritical temperature of RP3, heat transfer coefficient decreases as a result of drastic decrease of the specific heat. The conventional heat transfer correlations, that is, Gnielinski formula, are no longer proper for the supercritical heat transfer of RP3. The modified Jackson and Hall formula, which was proposed for supercritical CO 2 and water, gives good prediction except when the wall temperature is near or higher than the pseudocritical temperature.

Experimental and Numerical Study on Oxidation Deposition Properties of Aviation Kerosene

“…The convection terms were discretized in a second-order upwind scheme. The RNG k –ε model was used for simulation of the turbulent flow, which predicted the convective heat transfer under supercritical conditions well. , In Figure a, the inner diameter of the circular reactor tube is 2 mm with a wall thickness of 0.5 mm, and the total length of the tube is 450 mm. The outer wall temperature profiles obtained from the experiments were used as the outer surface boundary condition along the tube, and the inner surface was set as a no-slip wall.…”