Study on surrogate model of endothermic hydrocarbon fuel RP-3

Numerical computations of density, viscosity, thermal conductivity and specific heat of five kinds of surrogate models for endothermic hydrocarbon fuel RP-3 by extended corresponding state law were conducted. In the computation, the temperature and pressure ranged from 300 K to 800 K and from 3 MPa to 6 MPa, respectively. Results indicated that all surrogate models could qualitatively reproduce sharp variation of physical property of RP-3 in the vicinity of pseudo-critical temperature; a three-species surrogate model consisting of mole of 53% n-undecane, 18% n-butylcyclohexane, 29% 1, 3, 5-trimethyl-benzene performed best among five physical surrogate models in predicting physical property of RP-3. The relative errors of this surrogate model for density were less than 0.08 at the temperature from 300 K to 700 K. Pseudo-critical temperature increased with growing relative molecular mass of surrogate models, showing that there was no obvious relationship between thermal properties under pseudo-critical temperature and relative molecular mass of surrogate models.