Patent ID: 6068467
Filing Date: 2000-05-30
Classification: F23D

Abstract:
A combustor comprising:an inner cylinder having a front end opening into a combustion chamber;a pilot nozzle at a central portion of said inner cylinder;a plurality of main nozzles arranged circumferentially around said pilot nozzle, said plurality of main nozzles having respective openings;a flame holding cone extending from the front of said pilot nozzle, said flame holding cone having a leading end portion with an opening inside of said front end of said inner cylinder whereby a premixed flame can be formed by generating a flame ahead of said flame holding cone from inside of said inner cylinder for igniting fuel from said plurality of main nozzles; andextension pipes extending from said openings of said plurality of main nozzles to said opening of said leading end portion of said flame holding cone;wherein said extension pipes extend from said main nozzles along the outer circumference of said flame holding cone to respective openings located at the axial position of said opening of said leading end portion of said flame holding cone, said openings of said extension pipes having elliptical sectional shapes having longer axes arranged in the circumferential direction of said inner cylinder.