Ultraviolet (UV) spontaneous vibrational Raman scattering is used for temperature measurements in premixed methane/air flat flames burning at 1-5 bar. The measured spectra indicate that the peak and integrated intensities of the O2 and N2 Stokes Raman signals are linearly proportional to pressure at room temperature. Temperature measurements are made by spectral-fit of the theoretical spectra to the measured N2 Q-branch spectra. The Raman-measured temperatures agree well with the thermocouple-measured temperatures. The line widths (full width at half maximum; FWHM) of the trapezoidal slit function in flames at 1-5 bar are used to extrapolate the line widths for pressures up to 30 bar. The calculated theoretical spectra indicate that the spectral-fit method can be used to determine flame temperature at conditions close to adiabatic and 30 bar with an adequate accuracy.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Physics and Astronomy(all)