초록 ▼

A turbofan-ramjet engine is provided with optional duct burning in the turbofan mode. A core engine is provided with a first annular passage therearound for directing airflow around the inlet of the core engine. A second annular passage having a fan directs air flow into the inlet of the core engine

A turbofan-ramjet engine is provided with optional duct burning in the turbofan mode. A core engine is provided with a first annular passage therearound for directing airflow around the inlet of the core engine. A second annular passage having a fan directs air flow into the inlet of the core engine and said first annular passage. A third annular passage extends around the first and second annular passage with the first and third annular passage each directing their flow into a common annular combustion chamber. Variable vanes are provided in the first and third annular passages to provide for blocking off the passage or acting as swirl vanes depending on mode of operation. Blocking vanes are also provided in the annular exhaust passage of the core engine. Coannular nozzles are provided with one located at the exhaust of the core engine and an outer one located aft of the common annular combustion chamber. Air bleed means are provided for providing a positive pressure behind vanes in the first or third annular passage when either one is placed in its flow-blocking position to prevent undesired propagation of flame into that passage.

대표청구항 ▼

A method of operating a turbofan-ramjet engine having a core engine and an annular fan duct and ram duct located therearound having a common annular combustion chamber, said core engine and said common combustion chamber each having means for controlling the flow therefrom, the steps of: (1) operati

A method of operating a turbofan-ramjet engine having a core engine and an annular fan duct and ram duct located therearound having a common annular combustion chamber, said core engine and said common combustion chamber each having means for controlling the flow therefrom, the steps of: (1) operating the engine for turbofan operation with no duct burning by (a) blocking the flow through said ram duct; (b) flowing air through said fan duct; and (c) controlling the flow from said common annular combustion chamber; (2) operating the engine for turbofan operation with duct burning by (a) providing burning within said common annular combustion chamber while swirling the air flowing through the fan duct at a desired angle of swirl; (3) operating the engine for ramjet operation by (a) blocking the flow through said core engine; (b) blocking the flow through said fan duct; and (c) providing burning within said common annular combustion chamber while swirling the air flowing through the ram duct at a desired angle of swirl.