Abstract
Abstract The radiative preheating of the unburned hydrocarbon fuels by the burned combustion products in counterflow diffusion flame at pressures from 1 to 100 atm was investigated. The radiative characteristics of hot H2O, CO2 and cold hydrocarbon gases were calculated from HITEMP 2010, CDSD-4000 and HITRAN 2016 databases respectively. A simplified radiation reabsorption model was given based on the properties of the radiative reabsorption energy at T = 1500–2000 K, P = 1–100 atm. By using this model, the critical strain rate was calculated for eight C1-C6 hydrocarbon species at T = 2000 K, P = 1–100 atm. The results show that radiation reabsorption should be taken into account when the strain rate is less than 2.9 s−1 at P = 100 atm. The comparison results of the radiation time and the residence time in the CH4 counterflow diffusion flame shows that the radiation time scale would dominate at elevated pressures.
Published Version
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