chapter  28
14 Pages

AN INNOVATIVE METHOD FOR REDUCING GASEOUS EMISSIONS FROM POWER TURBINE COMBUSTORS

AN INNOVATIVE METHOD FOR REDUCING GASEOUS

EMISSIONS FROM POWER TURBINE COMBUSTORS

S. Singh and R. E. Peck

An experimental study of spray combustion with porous inserts was

performed using a laboratory combustor consisting of an on-axis fuel

nozzle/air swirler in a concentric pipe with high-bypass air ow. The

fuel used in all tests was Jet-A. Combustor performance was evaluated

by measuring exhaust emissions and ame temperatures for dierent

operating conditions with and without ceramic foam inserts of various

properties. Experimental results indicated that the enhanced heat trans-

fer in the ame zone could reduce nitrogen oxides (NO

x

) and unburned

hydrocarbon (UHC) emissions by up to 60%, while carbon monoxide

concentrations depended on sustaining rapid burnout downstream of

the porous layer. NO

x

concentrations were found to be a function of

the location, thickness, and pore size of the insert. Placing a second

porous layer downstream could yield further reductions in NO

x

/UHC

emissions. Test results for dierent ring rates and equivalence ratios

revealed the residence time in the porous layer is an important factor

regulating combustor performance.