1386. A Design Analysis Technique for Evaluating Size and Weight of V/STOL Lift Fans


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P F Piscopo, R S St. John: 1386. A Design Analysis Technique for Evaluating Size and Weight of V/STOL Lift Fans. 1980, (L. R. ‘Mike’ Hackney Award).



Recurring Interest in V/STOL aircraft is placing stringent demands on the design of highly optimized integrated propulsion systems. The optimization process requires analytic tools which account for all primary design variables and result in accurate estimation of performance, size and weight of the various propulsion system components. This paper addresses an analytic tool developed to enhance the optimization process for lift fan components associated with a wide range of V/STOL configurations. The lift fan methods, although emphasizing weight, also provide considerable design analysis capability. The estimation approach is analytic on a component by component basis designed in accordance with MIL-E-5007D. As shown on Figure 1 the lift fan is separated into 11 major elements with each major element further separated into sub-components. As an example, the fan blade method consists of four components each sized to meet load conditions, stress limitations and geometrical constraints. The methods provide accountability for design factors such as blade containment, variable geometry rotor blades and vanes, dynamic tuning (i.e., shrouds), foreign object damage and materials technology. The remainder of this paper presents a general summary of the fan size and weight estimation methods derived in Ref. A.


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