Extinction of Premixed Counterflow Ammonia-Air Flames
- RTX Technology Research Center; RTX Technology Research Center
- University of Connecticut
- RTX Technology Research Center
The effects of radiative heat loss and pressure on premixed counterflow ammonia-air flames have been investigated as a function of equivalence ratio. Non-adiabatic counterflow premixed flame simulations incorporating detailed chemistry, transport and radiative heat transfer in the optically thin limit have been employed to elucidate important underlying physics and extinction characteristics. Non-adiabatic counterflow premixed computations show that the combined effects of positive flame stretch and radiative heat loss for sub-unity Lewis number mixtures lead to the extension of the lean flammability limit for ammonia-air flames, revealing a C-shaped curve near the lean flammability limit that exhibits both radiative-induced and stretch-induced extinction states. The computations compare favorably with the experimentally determined extinction stretch rate values for the stretch-induced extinction states over a wide range of equivalence ratios at different pressures up to 6 atm.
- Research Organization:
- RTX Technology Research Center
- Sponsoring Organization:
- USDOE; USDOE Office of Fossil Energy and Carbon Management (FECM)
- DOE Contract Number:
- FE0032169
- OSTI ID:
- 2323928
- Country of Publication:
- United States
- Language:
- English
Similar Records
Radiation extinction limit of counterflow premixed lean methane-air flames
Effect of Pressure on Structure and Extinction of Counterflow Premixed Ammonia/Air Flames