Feasibility Study of Cruise Fan Propulsion Systems and Associated Power Transfer Systems for Compound/Composite Aircraft

摘要

The report examines the feasibility and relative merit of five gas- and shaft-coupled cruise fan propulsion systems in various compound and composite aircraft configurations. A 1970 time period is assumed. Propulsion and airframe parameters are defined, and the results of an optimization process for maximum aircraft relative productivity in a fixed short-range transport mission are shown. Ranges of vehicle disc loading of from 5 to 11 pounds per square foot and of fan bypass ratio of from 3 to 12 are covered. The problems of rotor-fan power transfer systems are reviewed and possible solutions evaluated. Detailed weight data is given for optimum aircraft and propulsion system combinations. Convertible shaft-driven cruise fans in an integrated propulsion system are found to be particularly attractive; however, considerable work is required in development of power management systems. (Author)