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US 4,374,466 AGranted
Gas turbine engine
AssigneeROLLS-ROYCE plc
InventorArthur Sotheran
Life of this patent
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AssigneeROLLS-ROYCE plc
InventorArthur Sotheran
Estimating the term…
A gas turbine engine comprises an annular combustion chamber (13) intended for low nitrogen oxide emission. The chamber has a pre-mixing section (20) in which an air-fuel mixture is brought to a significant degree of vaporization before issuing through a grill (22) at the end of the pre-mixing section into a main section (21) of the chamber. Pilot sections (18,19) at opposite sides of the pre-mixing section have outlets (28,29) through which burning mixture from the pilot sections is discharged into main section (21). The grill (22) defines openings (35) through which the fresh mixture from the pre-mixing section (20) is discharged across the outlets (28,29) of the pilot sections (18,19) to mix with and become ignited by the burning mixture. The pre-mixing section (20) is an annular duct (33) having walls (15,16) which extend in the direction of the axis of the chamber and are straight in that direction though slightly convergent. The arrangement favors vaporization in the duct without auto-ignition. A modification describes a cooling system for the grill (22).
A gas turbine engine comprising an air compressor, a combustion chamber comprising a pre-mixing section arranged to receive air flow from the compressor and having spaced apart walls, means for discharging fuel into the pre-mixing section thereby to creat an air-fuel mixture therein, a main section arranged downstream of the pre-mixing section, an array of baffles arranged in spaced-apart pairs, the two baffles of each pair having a common portion from which the two baffles diverge in the direction from the pre-mixing to the main section, adjacent said pairs being spaced apart to define flow passages therebetween, and cooling air duct means having inlets arranged to receive air flow from said compressor but being clear of any fuel supply and having outlets directed into a space defined between the baffles of each said pair of baffles thereby to cool the surfaces of the baffles facing the main section.
Dependencies are inferred from the claim text.