초록 ▼

Many government entities regulated emission from gas turbine engines including CO. CO production is generally reduced when CO reacts with excess oxygen at elevated temperatures to form CO2. Many manufactures use film cooling of a combustor liner adjacent to a combustion zone to increase durability o

Many government entities regulated emission from gas turbine engines including CO. CO production is generally reduced when CO reacts with excess oxygen at elevated temperatures to form CO2. Many manufactures use film cooling of a combustor liner adjacent to a combustion zone to increase durability of the combustion liner. Film cooling quenches reactions of CO with excess oxygen to form CO2. Cooling the combustor liner on a cold side (backside) away from the combustion zone reduces quenching. Furthermore, placing a plurality of concavities on the cold side enhances the cooling of the combustor liner. Concavities result in very little pressure reduction such that air used to cool the combustor liner may also be used in the combustion zone. An expandable combustor housing maintains a predetermined distance between the combustor housing and combustor liner.

대표청구항 ▼

[ We claim:] [22.] A method for reducing emissions of a gas turbine engine comprising the steps of:directing a volume of air having a first pressure to a combustor, said combustor having a combustor cooling shield, a combustor liner, and a cooling channel between said combustor cooling shield and sa

[ We claim:] [22.] A method for reducing emissions of a gas turbine engine comprising the steps of:directing a volume of air having a first pressure to a combustor, said combustor having a combustor cooling shield, a combustor liner, and a cooling channel between said combustor cooling shield and said combustor liner, said combustor liner having an inlet portion, an outlet portion, and a plurality of concavities adjacent said combustor cooling shield, said concavities being adapted to retard growth of a thermal boundary layer;diverting a first portion of said volume of air into said cooling channel intermediate said inlet portion and said outlet portion;diverting a remainder of said volume of air into said inlet portion;passing said first portion over said concavities, said first portion convectively cooling said combustor liner; anddirecting said first portion into said inlet portion, said first portion being at a second pressure wherein said second pressure being about equal to said first pressure.