Cars measurements at high pressure in a CH₄/O₂Jet flame

The combustion process in a high-pressure gaseous methane/gaseous oxygen rocket model combustor was investigated by means of optical and laser spectroscopic measurements as well as numerical simulations. The combustor was operated at a pressure of 1.0 MPa and at two mixture ratios (O/F = 1 and 2). OH∗ chemiluminescence imaging was applied for a qualitative analysis of the position and shape of the flame brush. For quantitative results, coherent anti-Stokes Raman spectroscopy (CARS) was applied to measure the spatial temperature distribution inside the combustion chamber. H2 and H2O molecules were probed simultaneously using two synchronized broadband CARS setup. Temperatures were derived from the H2 and H2O single-shot CARS spectra. Furthermore, the Transported Partially Stirred Reactor (TPaSR) model has been employed for simulations at the same operating conditions. The comparison of the numerical simulations to the experimental temperature distributions shows already qualitative agreement although further improvements are still needed.