Laminar Burning Velocities and Markstein Lengths of Jet Fuel Surrogate/Air Mixtures in a Spherical Chamber

International audienceCharacterizing the propagation of jet fuel/air premixed flames during combustion is key to understanding the performances of advanced modes of combustion for turbo-engines. Consequently, a better knowledge of the combustion characteristics is necessary. Particularly, the laminar burning velocity and the Markstein length in laminar adiabatic conditions are both key parameters to improve the efficiency of innovated turbo-engines with technological breakthrough as constant-volume combustion. In the current study, a spherical combustion chamber equipped with various metrology systems is qualified. First, the new experimental setup is validated with methane/air premixed laminar flames at normal temperature and pressure. The laminar burning velocity of four jet fuel surrogates is then characterized. Measurements are performed over a range of equivalence ratios from 0.7 to 1.5, initial temperature of 400 K, and initial pressure of 0.1 MPa. The results are compared with experimental data available in the literature and with calculations using the chemical kinetics code CANTERA (1D model) and existing chemical kinetic mechanisms. A comparison between the different surrogates is then discussed