GAS TURBINE COMBUSTOR WITH FLUID MIXING APPARATUS USING FUEL AND HIGH- AND LOW-PRESSURE AIR STREAMS

A fluid mixing apparatus (100) includes mixing conduits (150) that extend through a fluid plenum (132). The fluid plenum (132), which surrounds a first wall (110) defining a main passage (112) fluidly coupled to a low-pressure fluid source (115), is surrounded itself by a second wall (120) defining a high-pressure plenum (122) fluidly coupled to a high-pressure fluid source (125). An insulated tube (740) disposed at the inlet (117) of the first wall (110) delivers a third fluid. The mixing conduits (150) fluidly couple the high-pressure plenum (122) to the main passage (112), where the high-pressure fluid is mixed with low-pressure fluid and the third fluid. Optionally, the fluid plenum (132) may house a fourth fluid that is injected through injection holes (154) in the mixing conduits (150). The fluid mixing apparatus (100) may be used to mix one or more fuels with high- and low-pressure air in a gas turbine combustor (17, 70).