Patent ID: 6272842
Filing Date: 2001-08-14
Classification: F23R

Abstract:
A variable length pre-mixer assembly comprising an upstream end for receiving compressed air from a compressor and a downstream end disposed in flow communication with a combustor, said pre-mixer assembly comprising:an upstream forward clamp;a swirler assembly having a plurality of circumferentially spaced apart vanes disposed adjacent said upstream end for swirling compressed air channeled therethrough and an elongate centerbody having a first end joined to and extending through said swirler assembly and a second end disposed downstream therefrom;a downstream fuel nozzle shroud having an outlet in flow communication with said combustor; andat least one removably disposed fuel nozzle spacer;wherein said fuel nozzle spacer is alternatively moveable between a first position between said upstream forward clamp and said swirler assembly and a second position between said swirler assembly and said downstream fuel nozzle shroud so as to change the relative position of said swirler assembly and alter said pre-mixer assemblies acoustical resonance characteristics.