B - Operations – Transporting – 64 – C
Patent
B - Operations, Transporting
64
C
60/145
B64C 29/00 (2006.01)
Patent
CA 1136432
Abstract A propulsion system for use primarily in V/STOL aircraft is provided with a variable cycle, double bypass gas turbofan engine and a remote augmenter to produce auxiliary lift. the fan is oversized in air-pumping capa- bility with respect to the cruise flight requirements of the remainder of the engine and a variable area, low pressure turbine is capable of supplying vary- ing amounts of rotational energy to the oversized fan, thereby modulating its speed and pumping capability. During powered lift flight, the variable cycle engine is operated in the single bypass mode with the oversized fan at its maxi- mum pumping capability. In this mode, substantially all of the bypass flow is routed as an auxiliary airstream to the remote augmenter where it is mixed with fuel, burned and exhausted through a vectorable nozzle to produce thrust for lifting. Additional lift is generated by the high energy products of combus- tion of the variable cycle engine which are further energized in an afterburner and exhausted through a thrust vectorable nozzle at the rear or the engine. In the cruise operating mode, the fan is driven at a slower notational speed and all of the bypass flow is directed to a variable area bypass injector where it is mixed with the variable cycle engine products of combustion and exhausted as a mixture through the rear nozzle. The variable cycle engine can be selectively operated in the single or double bypass mode during cruise to maximize effi- ciency as the aircraft speed is varied. Because the total Installed thrust is available in the forward cruise mode, an aircraft powered by the propulsion system of the present invention has substantially greater capabilities in the areas of excess power, acceleration time and combat ceiling when compared to prior art conceptions embodying separate lift plus lift/cruise engine. Additionally, by not having to develop and maintain a separate lift engine system, a substantially lower aircraft life cycle cost is possible.
309989
Castells Onofre T.m.
Johnson James E.
Rundell Dan J.
Company General Electric
Eckersley Raymond A.
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