Abstract: Disclosed is a premix injector for mixing air and fuel and injecting the mixture into a combustion chamber. The premix injector includes an air blast fuel nozzle, a venturi, and a premix chamber. The venturi extends from an inlet to an exit which is in fluid communication with a combustion chamber. Importantly, the venturi has a jet deflector along its interior wall near its exit and on the side of the venturi nearest the exit of the combustor.

Abstract: A lean-premix-prevaporization combustion system has a combustion chamber and a premixed injector that injects a hot gas, formed from the ignition of a lean mixture of air and fuel, into the combustion chamber. A pilot injector is mounted to the wall of the combustion chamber and injects fuel into the combustion chamber. Upon entering the combustion chamber this fuel ignites to form a fuel rich zone which stabilizes the flame in the combustor.

Abstract: An improved deceleration fuel control system and related method are provided for regulating fuel flow to a combustor of a gas turbine engine to permit deceleration as a maximum rate without risk of combustor blowout. The system includes a controller responsive to combustor air flow and engine shaft speed to calculate a minimum fuel-air ratio to sustain a combustor flame during a maximum rate deceleration condition. The controller then regulates fuel supply to maintain a deceleration fuel-air ratio at a selected safety margin higher than the calculated minimum to sustain combustion.