초록 ▼

A cold-air bypass duct in a hypersonic engine having a turbojet engine and a ramjet engine in the same housing. A common air inlet and exhaust nozzle are provided for the turbojet and ramjet engines. The air inlet is designed to provide the necessary air for the ramjet engine at maximum air requirem

A cold-air bypass duct in a hypersonic engine having a turbojet engine and a ramjet engine in the same housing. A common air inlet and exhaust nozzle are provided for the turbojet and ramjet engines. The air inlet is designed to provide the necessary air for the ramjet engine at maximum air requirements. Less air is needed by the turbojet engine when it is in operation. The excess air entering the inlet during turbojet engine operation enters a bypass duct normally used for ramjet operation. The air entering the bypass duct exits the housing behind the ram burner and turbojet nozzle throat. When the ramjet operates, a vent in the bypass duct opens to direct a portion of the air into the ram burner. When the ramjet engine is operating at maximum air requirements, all the air entering the bypass duct enters the ram burner. The bypass duct is a single duct with a vent and an associated barrier that are openable to multiple positions. Alternatively, a plurality of bypass ducts are provided, each having respective vents operating independently to direct the required amount of air into the ramjet.

대표청구항 ▼

A hypersonic propulsion system comprising: a housing enclosing a turbojet engine and a ram burner; an air inlet coupled to said housing for providing air to said turbojet engine and said ram burner; a turbojet nozzle having a throat coupled to said housing for providing an exhaust from said turbojet

A hypersonic propulsion system comprising: a housing enclosing a turbojet engine and a ram burner; an air inlet coupled to said housing for providing air to said turbojet engine and said ram burner; a turbojet nozzle having a throat coupled to said housing for providing an exhaust from said turbojet engine and said ram burner; a bypass duct enclosed in said housing and receiving bypass air from said inlet and exhausting said bypass air at a bypass outlet, said bypass outlet being located behind the throat of said turbojet nozzle; a vent in said bypass duct selectively permitting bypass air to enter said ram burner; a vent member positioned within said vent for selectively opening said vent to a predetermined vent area; a barrier member in said bypass duct selectively directing the bypass air into said vent or said bypass duct outlet; and a bypass throat member positioned within said bypass duct, said bypass throat member being movable to provide a variable throat area within said bypass duct, said bypass throat being located aft of said turbojet nozzle throat.