Probability density functions and correlations of temperature and molecular concentrations in turbulent diffusion flames

摘要: Simultaneously-acquired, time-resolved values of temperature and concentrations nitrogen, oxygen, hydrogen, water vapor have been measured in hydrogen-air turbulent diffusion flames using pulsed vibrational Raman spectroscopy. The mean probability density functions (histograms) each scalar variable present reasonable trends for data obtained at numerous flame locations. Correlations instantaneous concentration agree with adiabatic calculations fuel-lean zones, but display departures fuel-rich conditions which are least partially ascribed to the differential hydrogen. Other processes, such as radiative heat loss incomplete combustion, could not account observed deviations. These conclusions supported by Bilger's (1981) calculations, agreement our except high regions. When Reynolds number was increased from 1500 4500 smaller deviations low regions were observed, expected, zones affected appreciably.