Systems and Methods for Preventing Flashback in a Combustor Assembly

A combustor assembly, comprising:

• a combustion chamber;
• a first fuel plenum;
• a second fuel plenum;
• and
• one or more elongate air/fuel premixing injection tubes, each of the one or more elongate air/fuel premixing injection tubes comprising:
• a first length at least partially disposed within the first fuel plenum and configured to receive a first fuel from the first fuel plenum to create a first air/fuel mixture;
• and
• a second length disposed downstream of the first length and at least partially disposed within the second fuel plenum, wherein the second length is formed of a porous wall configured to allow a second fuel from the second fuel plenum to enter the second length and create a boundary layer of a second air/fuel mixture about the porous wall.

A method for air/fuel premixing in a combustor, comprising:

• directing a flow of air into one or more elongate air/fuel premixing injection tubes;
• directing a first fuel from a first fuel plenum into the one or more elongate air/fuel premixing injection tubes along a first length;
• and
• diffusing a second fuel from a second fuel plenum along a second length into the one or more elongate air/fuel premixing injection tubes through a porous wall to create a boundary layer about the porous wall downstream of the first length.