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EFFECTS OF RADIATION REABSORPTION IN C1-C6 HYDROCARBON FLAMES AT NORMAL AND ELEVATED PRESSURES

DOI: 10.1615/RAD-19.100
pages 73-81

Shu Zheng
Department of Thermal Engineering, Tsinghua University, Beijing 100084, China; North China Electric Power University, Beijing 102206, China; Princeton University, Princeton, NJ 08544, USA

Wenkai Liang
Princeton University, Princeton, NJ 08544, USA

Huaqiang Chu
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, P. R. China; School of Energy and environment, Anhui University of Technology, Ma’anshan 243002, Anhui, China

Huaichun Zhou
School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Résumé

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 proposed 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.

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