Experimental examination of the leading-edge suction analogy

Joseph Er-El, Yitzhak Zohar

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The potential and vortical components of the normal force and their chordwise distribution, as defined by the Leading-Edge Suction Analogy (LESA), as well as the normal force itself and its chordwise distribution, were obtained experimentally and were compared with the predicted results. The comparison was carried out for the delta wings having leading-edge sweep angles of 75 and 60 deg. The experimental results were obtained from surface pressure measurements by invoking the linearized potential-flow wing theory, which was also used in the derivation of LESA. The comparison shows that, for the low-aspect-ratio wing, the agreement between measured and predicted results is good-in the 0-20 deg incidence range. In the high-aspect-ratio wing, the differences between experiment and theory are large for CNP, CNy, and their longitudinal loadings, and considerably smaller for CN. Thus, LESA appears less valid for the high-aspect-ratio wing than was previously thought on the basis of a comparison of the CN values only.

Original languageEnglish (US)
Pages (from-to)195-199
Number of pages5
JournalJournal of Aircraft
Issue number3
StatePublished - Mar 1988

ASJC Scopus subject areas

  • Aerospace Engineering


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