Journal Article

Prediction of Transport Properties of Hydrocarbon Aviation Fuels Using TRAPP Methods

Hwang, Sung-rok, Lee, Hyung Ju, Park, Wontae

2023

Overview

This study presents a methodology and its results for predicting transport properties using two TRAPP methods, adopting CH 4 and C 3 H 8 as the reference fluids, over a wide range of temperature and pressure conditions, including both subcritical and supercritical regions. When hydrocarbon aviation fuels circulate in the regenerative cooling system of a hypersonic flight vehicle, endothermic reactions take place and reaction products are created. Here the viscosity and thermal conductivity of representative fuels and some of their products are predicted in the range of temperatures from 400 to 1000 K and pressures from 0.1 to 5.0 MPa. The results are then compared with data from the NIST database in terms of relative deviation. The TRAPP methods are found to be capable of predicting the viscosity and the thermal conductivity of both light and heavy hydrocarbons and their mixtures over a large range of liquid, gas, and supercritical regions. The relative deviations, however, tend to be considerably larger for higher molecular weight hydrocarbons, because the prediction performance for the liquid state is worse than that for the gaseous and supercritical states. It is also observed that the accuracy of the prediction of viscosity by the methane-based TRAPP (m-TRAPP) method is in general much better than that by the propane-based TRAPP (p-TRAPP) method, with an average relative deviation of within 22%. On the other hand, the p-TRAPP method offers excellent predictions of thermal conductivity in both the gas and the liquid regions, with an average relative deviation of within 14%. It would, therefore, be reasonable to use m-TRAPP for predicting the viscosity and p-TRAPP for the thermal conductivity of recirculating aviation fuels and the hydrocarbons produced by the fuels’ endothermic reactions.

• Publisher: The Korean Society for Aeronautical & Space Sciences (KSAS),Springer Nature B.V,한국항공우주학회
• Subject: Aerospace Technology and Astronautics / Aviation fuel / Catalytic cracking / Cooling / Cooling systems / Deviation / Endothermic reactions / Engineering / Flight vehicles / Fluid- and Aerodynamics / Heat conductivity / Heat transfer / Hydrocarbons / Hypersonic flight / Methane / Methods / Original Paper / Reaction products / Regenerative cooling / Temperature / Thermal conductivity / Transport properties / Viscosity / 항공우주공학