초록 ▼

A lean-burn combustor for a gas-turbine engine has a radial inflow pre-mixing, pre-swirling burner with a central burner face which forms the upstream wall of a pre-chamber of the combustor. A circular recess is formed in the burner face, the recess having at least one pilot fuel injector for introd

A lean-burn combustor for a gas-turbine engine has a radial inflow pre-mixing, pre-swirling burner with a central burner face which forms the upstream wall of a pre-chamber of the combustor. A circular recess is formed in the burner face, the recess having at least one pilot fuel injector for introducing pilot fuel tangentially into the recess, whereby the burner runs cooler and combustion characteristics are improved.

대표청구항 ▼

[ I claim:] [1.] A lean-burn combustor for a gas-turbine engine, the combustor having, in flow series, a radial inflow premixing burner, an axial flow combustion pre-chamber having a cross-sectional area and an axial centerline, and an axial flow main combustion chamber having a larger cross-section

[ I claim:] [1.] A lean-burn combustor for a gas-turbine engine, the combustor having, in flow series, a radial inflow premixing burner, an axial flow combustion pre-chamber having a cross-sectional area and an axial centerline, and an axial flow main combustion chamber having a larger cross-sectional area than the pre-chamber, the burner comprising:a) a fuel and air mixing device located radially outwardly of the pre-chamber for mixing primary fuel and air before a resulting fuel and air mixture enters the pre-chamber, the mixing device being adapted to impose on the fuel and air mixture entering the pre-chamber a motion having a vigorous swirling component about the axial centerline of the pre-chamber;b) a burner face located radially inwardly of the fuel and air mixing device and forming an axially upstream wall of the pre-chamber, the burner face incorporating pilot fuel injection means for injection of pilot fuel into the pre-chamber;c) whereby, during operation of the combustor, an axial re-circulating vortex core flow of gases extends between the burner face and an upstream part of the main chamber; andd) the pilot fuel injection means being disposed within a recess in the burner face, the recess being substantially circular in plan view, the pilot fuel injection means being adapted to inject the pilot fuel into the recess in a substantially tangential direction with respect to the circular recess, whereby operating temperatures of the burner face are thereby reduced and combustion characteristics improved.