Temperature Measurements in High Pressure Combustion

Abstract

We report on a fundamental study of N2 and H2 CARS thermometry in a high‐pressure, premixed methane/air flame. Based on CARS spectra of high quality, models were developed for spectral shape calculations in order to determine accurate temperatures. Rotational Raman spectra were used to measure an independent reference temperature. The limits of applicability were shown. Single‐pulse N2 CARS thermometry on a subscale ramjet combustor with 3 bar pressure inside the combustion chamber was performed.

Temperature measurements in combustion—not only with CARS: a look back at one aspect of the European CARS Workshop

“…The situation becomes even more complicated at elevated pressure, where pressure broadening and line mixing lead to a significant change in the spectral shape, in particular at the band head, which therefore have to be accounted for in data evaluation. 11 In addition, the influence of the non-resonant background becomes more important with increasing pressure and has to be suppressed experimentally by polarization techniques, if possible by reasons of signal intensity, to achieve accurate temperature values.…”

Hybrid fs/ps coherent anti-Stokes Raman scattering for multiparameter measurements of combustion and nonequilibrium

“…Additionally, by modeling Raman linewidths and linemixing effects [17,18,19], thermometry at high pressure was made possible. One study in particular by Stricker et al used N 2 and H 2 CARS to measure temperature at pressures up to 40 bar [20].…”

“…20 Shadowgraphs of the separation growth between the decaying shock wave and the combustion products at the detonation tube exit. .…”