Patent ID: 6799427
Filing Date: 2004-10-05
Classification: F23R

Abstract:
An injection system for injecting an air/fuel mixture into a combustion chamber of a gas turbine engine, said injection system having a longitudinal axis and comprising fuel injection means interposed between first and second air injection means, said fuel injection means being disposed in an annular internal cavity of a Venturi, said cavity being defined by a substantially axial upstream wall and by a substantially radial downstream wall, said fuel injection means comprising at least a first fuel admission circuit provided with at least one fuel injection orifice, and a plurality of second fuel admission circuits independent from the first fuel admission circuit(s), each being provided with at least one fuel injection orifice so as to define a plurality of independent modes of injecting the air/fuel mixture depending on determined operating speeds of the engine, wherein the fuel injection orifice of the first fuel admission circuit is formed in the upstream wall of the Venturi so as to inject fuel towards the combustion chamber in a general direction that is substantially perpendicular to a flow of air coming from the first air injection means, and wherein the fuel injection orifices of the second fuel admission circuits are formed in the downstream wall of the Venturi so as to inject fuel towards the combustion chamber in a general direction that is substantially perpendicular to a flow of air coming from the second air injection means.