Quantitative fluorescence measurements of the OH radical in high pressure methane flamesA method for quantifying laser-induced fluorescence signals from the OH radical in high-pressure flames is presented. The fluorescence signal per unit OH mole fraction is modeled as a function of temperature, pressure, and overall flame stoichiometry. Known values of the collisional quenching cross sections as a function of temperature are used to model the electronic quench rate. The reverse A - X (1.0) Q15 transition is used with broadband collection to measure single-point fluorescence produced by a pulsed Nd:YAG-pumped, frequency-doubled dye laser. Laser absorption and thermocouples are used to measure absolute OH concentration and temperature, respectively, which are used to confirm the validity of the model. Measurements are made in CH4/O2/N2 flames up to 10 atm.
Document ID
19920064352
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Battles, B. E. (NASA Lewis Research Center Cleveland, OH, United States)
Hanson, R. K. (Stanford University CA, United States)