Effect of water addition on auto-ignition of kerosene under afterburner relevant conditions

Ignition delay times were measured for stoichiometric kerosene/air mixtures with and without H2O addition behind reflected shock conditions: pressures of 0.45 - 7.5 atm and temperatures of 900 - 1450 K. The effect of H2O addition on the reactivity of RP-3 was explored at various pressure and temperatures. The Arrhenius-type expressions were fitted by using the current ignition data. A four-component surrogate model of RP-3 was proposed based on similarity criterion of function group. The proposed model generally reproduces the tendency of pressure-dependence of ignition delay times but it over-predicts the experimental data at lower pressures. The addition of H2O presents different effects at elevated pressures. The kinetic analysis was performed to clarify the kinetic and thermodynamic effects.