Premixed flames in CO2 diluted CH4-O2-He mixtures were studied both experimentally and numerically to investigate the effects of spectral dependent radiation reabsorption on the flame propagation and flammability limit. Laminar burning velocities of CH4-O 2-He-CO2 mixtures at both normal and elevated pressures up to 5 atm were measured by using a pressure-release type spherical bomb. The measured data were compared with the results from computations performed with and without spectral radiation absorption. It was found that the spectral radiation reabsorption results in higher burning velocities of CH 4-O2-He-CO2 mixtures and wider flammability limits than predictions using the optically thin model. Furthermore, the enhancement becomes more significant at higher pressures. The results demonstrated that reabsorption effects must be considered to correctly predict flame speeds and extinction limits in flammability limit and burning properties of mixtures with CO2 addition.
|Number of pages
|Published - 2005
|43rd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: Jan 10 2005 → Jan 13 2005
|43rd AIAA Aerospace Sciences Meeting and Exhibit
|1/10/05 → 1/13/05
All Science Journal Classification (ASJC) codes