Patent ID: 6269646
Filing Date: 2001-08-07
Classification: F23C,F23D,F23R

Abstract:
A combustor comprising:an outer combustor casing defining a plurality of circumferentially adjoining combustion chambers, each combustion chamber comprising a dome at an upstream end and an outlet at a downstream end;a plurality of pre-mixers joined to said combustor dome of each respective combustion chamber, said pre-mixers comprising a duct having an inlet at one end for receiving compressed air, an outlet at an opposite end disposed in flow communication with said combustion chamber and a swirler disposed in said duct adjacent said duct inlet for swirling air channeled therethrough; anda plurality of fuel injectors for injecting fuel into said pre-mixer ducts and for mixing with said air in said ducts for flow into said combustion chamber to generate combustion flames at said duct outlets;wherein a portion of said pre-mixers comprise an altered flameholding capability so as to distribute said resulting combustion flames from said respective portion of said pre-mixers axially downstream with respect to a portion of non-altered pre-mixers to reduce the dynamic pressure amplitude of said combustion flames;wherein said pre-mixers comprising an altered flameholding capability comprise at least one orifice for directing high velocity air to impinge upon said combustion flames so as to lift said respective combustion flames from said dome end and shift said combustion flames axially downstream.