| 摘要 |
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.
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