Chemiluminescent emission of CH*, C*2, OH*, and CO*2 during the ignition of ethane behind reflected shock waves

Abstract

The chemiluminescent emission from CH*, C*2, OH*, and CO*2 during the self-ignition of various mixtures of ethane with oxygen and argon behind reflected shock waves in the 1240–1790 K temperature range at a total concentration of the mixture М 5 = (1 ± 0.2) × 10−5 mol/cm3 is experimentally studied. It has been shown that the time-to-maximum in the emission intensity profiles is almost identical for all the emitters studied. How the pattern of the OH* emission profile changes with the temperature and mixture composition is examined. The CH* and C*2 emission profiles demonstrate virtually symbatic behavior in the covered ranges of temperature, pressure, and equivalence ratio. It is established that the emission signals from OH* and CO*2 appear earlier than the C*2 and CH* emission signals. The numerical simulation predictions are found to be in close agreement with the experimental results.