Patent ID: 7832212
Filing Date: 2010-11-16
Classification: F23D,F23R

Abstract:
1. A premixing device, comprising: an air inlet; a plurality of fuel inlet slots disposed around a circumference of the the premixing device and in flow communication with an end portion of the air inlet, the fuel inlet slots including a wall profile configured to form a fuel boundary layer along a portion of an inside wall of the premixing device; a mixing chamber where compressed air from the air inlet is mixed with fuel from the boundary layer, the mixing chamber being disposed downstream of the air inlet and the fuel inlet slots; and at least one converging-diverging fuel injection slot jet, the at least one converging-diverging fuel injection slot jet disposed inside each fuel inlet slot, the at least one converging-diverging fuel injection slot jet being configured to create a flow separation region inside a portion thereof, the flow separation region being confined to the diverging portion of the at least one converging-diverging fuel injection slot jet and being configured to generate mixing turbulence at an outlet of the at least one converging-diverging fuel injection slot jet to aerodynamically enhance a mixing of the fuel from the boundary layer with the compressed air without causing a boundary layer flow separation and a flame holding in the mixing chamber.