THE GENERALIZED APPROACH TO THE SELECTION OF PROPULSION SYSTEMS FOR AIRCRAFT
RAND CORP SANTA MONICA CA
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The generalized approach considers the powerplant in terms of the performance and application requirements of the aircraft. A powerplant choice for a given combination of these requirements represents a compromise between powerplant weight, frontal area, and fuel consumption. Parameters relating to the performance and application requirements of aircraft are used in simplified endurance equations, which encompass a broad range of applications, in combination with powerplant characteristics. By use of electronic calculating equipment, systematic evaluation of each powerplant type and variation within type is established for each selected combination of aircraft performance and application requirements. The powerplant is selected on the basis of maximum endurance which, under the method used, is equivalent to minimum total weight of powerplant plus fuel weight. The powerplant spectrum is represented by seven powerplant types Rocket, Ram Jet, Afterburning Turbojet, Turbojet, Ducted Fan, Turboprop with varying power division between propeller and jet, and Reciprocating. Effects of compressor pressure ratio and turbine inlet temperature on the characteristics of the gas turbine family are considered.
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