Multi-Species Measurements behind Reflected Shock Waves in Hydrocarbons using Laser Absorption

摘要

There is a critical need for accurate kinetic targets to test and refine large reaction mechanisms for jet fuel, and other practical fuels and surrogates mixtures. To this end, concentration time-histories for four species: C_2H_4, OH, CO_2, and H_20, were measured behind reflected shock waves during n-the oxidation of n-heptane, an important normal alkane fuel surrogate component. Experiments were conducted at temperatures of 1300 to 1600 K and a pressure of 2 atm using a mixture of 300 ppm nheptane in stoichiometric oxygen (|?=1) in argon. Ethylene was monitored using IR gas laser absorption at 10.53 microns; OH was monitored using UV laser absorption at 306.5 nm; and CO_2 and H_20 were monitored using tunable IR diode laser absorption at 2.7 and 2.5 microns, respectively. These time-histories provide kinetic targets to test and refine reaction mechanisms for nheptane and also serve to demonstrate the potential of this type of data for validation of reaction mechanisms. Comparisons are made with the predictions of the Sirjean et al./JetSurF 1.0 (2009) reaction mechanism for n-alkanes.