Publications

Dual-resolution Raman spectroscopy is a novel diagnostics technique for measurements of temperature and species in flames where multiple hydrocarbons are present. A dual-resolution Raman spectroscopy instrument has been developed and optimized for measurements of major species .g. N2 O2 H2O CO2 CO H2 and DME) and major combustion intermediates including CH4 CH2O C2H2 C2H4 and C2H6 in DME-air flames. The temperature dependences of the hydrocarbon Raman spectra over fixed spectral regions were assessed through a series of measurements in laminar Bunsen-burner flames and have been used to extend a library of previously acquired Raman spectra up to flame temperature. The first Raman measurements of up to twelve species in hydrocarbon flames and the first quantitative Raman measurements of formaldehyde in flames are presented. The accuracy and precision of the instrument were determined from measurements in laminar flames and the applicability of the instrument to turbulent DME-air flames is discussed.