Rotational and vibrational spontaneous Raman scattering (SRS) spectra ofH2,N2 andH2O have beenmeasured in H2air flames at pressures up to 30.4bar as a first step towards establishing a comprehensiveRaman spectral database for temperatures and species in high-pressure combustion. Wehave obtained an initial set of measurements that indicate the spectra are of sufficientquality in terms of spectral resolution, wavelength coverage and signal-to-noise ratio for usein the development of transferable standards for the cross-talk calibration matrix.The fully resolved Stokes and anti-Stokes shifted spectra were collected in thevisible wavelength range (400700nm) using pulse-stretched 532nm excitationand a spectrograph fitted with a non-intensified CCD detector and a high-speedshutter. Temperatures were determined via the intensity distribution of rotationalH2 lines at stoichiometric and fuel-rich conditions. A discussion of the temperaturemeasurement accuracy in terms of the number of laser shots, including a single-shotmeasurement, is presented. Theoretical Raman spectra of hydrogen were calculated using asemi-classical anharmonic-oscillator model with recent pressure broadening dataand were compared with experimental data. The data and simulation showedgood agreement at different equivalence ratios and pressures and indicate thathigh-J rotationallines of H2 mayinterfere with the N2 vibrational Q-branch lines, which could lead to errors inN2-Raman thermometry based on the line-fitting method. In addition, the relative intensities of theO-andS-branchesto the Q-branch were determined theoretically and the result indicates thatfurther studies of spectral interferences including contributions fromO-andS-branches should be pursued. Finally, from a comparison ofN2Q-branchspectra in lean H2air flames at nearly atmospheric (1.2bar) and high pressure (30.4bar), we found nosignificant line-narrowing or-broadening effects at a spectral resolution of 0.04nm.

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   |wiki=    Sante
   |area=    H2N2V1
   |flux=    Main
   |étape=   Exploration
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   |clé=     ISTEX:5A8150DA6A26A9DEF9D0355D66E53FF006223563
   |texte=   Measurement and simulation of spontaneous Raman scattering in high-pressure fuel-richH2air flames
}}