Conceptual Design Prediction of the Buffet Envelope of Transport Aircraft
2009 (English)In: Journal of Aircraft, ISSN 0021-8669, Vol. 46, no 5, 1593-1606 p.Article in journal (Refereed) Published
This paper describes a methodology that inexpensively predicts the buffet envelope of new transport airplane wing geometries at the conceptual design stage. The parameters that demonstrate a strong functional sensitivity to buffet onset were identified and their relative effect was quantified. To estimate the buffet envelope of any target aircraft geometry, the method uses fractional change transformations in consort with a generic reference buffet onset curve provided by the authors or the buffet onset of a known seed airplane. The explicit design variables required to perform buffet onset prediction are those describing the wing planform and the wingtip section. The mutually exclusive nature of the method's analytical construct provides considerable freedom in deciding the scope of free-design-variable complexity. The method has been shown to be adequately robust and flexible enough to deal with a wide variety of transport airplane designs. For the example transport airplanes considered, irrespective of aircraft morphology and en route flight phase, the relative error in prediction was found to be mostly within +/-5.0%, with occasional excursions not exceeding a +/-9.0% bandwidth. The standard error of estimate for the lift coefficient at 1.0 g buffet onset at a given Mach number was calculated to be 0.0262.
Place, publisher, year, edition, pages
2009. Vol. 46, no 5, 1593-1606 p.
Aircraft geometries, Design variables, En-route, Flight phase, Functional sensitivities, Lift coefficient, Relative errors, Standard errors, Transport airplane, Wing planforms, Mach number, Transport aircraft, Wings
IdentifiersURN: urn:nbn:se:kth:diva-9279DOI: 10.2514/1.41367ISI: 000270749600014ScopusID: 2-s2.0-73649108600OAI: oai:DiVA.org:kth-9279DiVA: diva2:54414
QC 20101104 Uppdaterad från submitted till published (20101104).2008-10-162008-10-162010-11-04Bibliographically approved