US 5,295,354 A · Low pollution combustion chamber for a turbojet engine

Abstract

A low pollution combustion chamber for a turbojet engine is disclosed in which first and second combustion chambers are oriented in a counter-flow direction and both combustion chambers communicate with a separate and distinct exhaust chamber. The first combustion chamber has a fuel injector, as well as a primary oxidizer intake, and the wall bounding the first combustion chamber defines a plurality of dilution oxidizer intake orifices. The wall also defines a first exhaust orifice located approximately midway between the upstream and downstream ends of the first combustion chamber. A second combustion chamber has a second fuel injector, as well as a second primary oxidizer intake, but the wall defining the second combustion chamber does not define any dilution oxidizer intake orifices. A second exhaust orifice also communicates with the exhaust chamber. The orientations of the first and second combustion chambers are such that the fuel/oxidizer mixtures traveling through the combustion chambers travel in a generally counterflow arrangement. A separate exhaust chamber is included in the combustion chamber assembly and communicates with the first and second combustion chambers such that the burned gases from these chambers enter the exhaust chamber. The exhaust chamber defines a third exhaust orifice through which the burned gases exit the combustion chamber assembly. The exhaust chamber is oriented such that the exhaust gases passing through this exhaust chamber travel in a direction generally parallel to the gases traveling through the second combustion chamber. A wall defining the combustion chamber defines a second plurality of dilution oxidizer intake orifices so that oxidizer may dilute the exhaust gases passing through this chamber.

Claims13

Dependent claims

A low pollution combustion chamber assembly for a gas turbine engine comprising:

a) first wall means bounding a first combustion chamber for low power operation having first fuel injector means, a first primary oxidizer intake located so as to mix injected fuel with the oxidizer in the first combustion chamber, ignition means to ignite the fuel/oxidizer mixture, and defining a first exhaust orifice, the first wall means defining a plurality of first dilution oxidizer intake orifices to allow oxidizer to pass therethrough into the first combustion chamber;
b) second wall means bounding a second combustion chamber for full power operation arranged in a generally parallel, counter-flow arrangement with respect to the first combustion chamber, the second combustion chamber having second fuel injection means, a second primary oxidizer intake located so as to mix injected fuel with the oxidizer in the second combustion chamber, and defining a second exhaust orifice such that exhaust gases from one combustion chamber do not communicate with the other combustion chamber, the second wall means defining no dilution intake orifices;
and,
c) an exhaust chamber communicating directly with both of the first and second exhaust orifices and defining a third exhaust orifice to exhaust burned combustion gases from the combustion chamber assembly, the third wall means defining a plurality of second dilution oxidizer intake orifices to allow oxidizer to pass therethrough into the exhaust chamber.

1 more element

Dependencies are inferred from the claim text.

Low pollution combustion chamber for a turbojet engine

Life of this patent

Low pollution combustion chamber for a turbojet engine

Life of this patent

Abstract

Claims13