Screech suppressor for advanced low emissions gas turbine combustor

A combustor comprising:

• a main combustion chamber;
• at least one premixer section attached to said main combustion chamber, said .premixer section including:
• a cylindrical premixer tube joined in flow communication with said chamber;
• a cylindrical centerbody disposed concentrically in said tube to define an annular flow channel therebetween having an inlet at one end and an exit at an opposite end thereof adjoining said chamber;
• a swirler disposed in said channel inlet for receiving and swirling compressed air;
• and
• fuel spokes disposed in said channel and downstream of said swirler for injecting fuel into said swirled air to form a fuel and air premix flowable through said channel to said exit and into said chamber;
• and
• means for suppressing screech disposed in said premixer section, said means for suppressing screech comprising a plurality of separate, solid body screech suppression members, said screech suppression members being uniformly circumferentially spaced apart from each other at said channel exit, and extending radially between said centerbody and said tube for substantially an entire radial distance therebetween except for a gap formed at one radial end of each of said members for accommodating thermal expansion.