Oscillatory blowing: A tool to delay boundary-layer separation

A. Siefert, T. Bachar, D. Koss, M. Shepshelovich, Israel J Wygnanski

Research output: Contribution to journalArticle

468 Citations (Scopus)

Abstract

The effects of oscillatory blowing as a means of delaying separation are discussed. Experiments were carried out on a hollow, flapped NACA 0015 airfoil equipped with a two-dimensional slot over the hinge of the flap. The flap extender over 25 % of the chord and was deflected at angles as high as 40 deg. The steady blowing momentum coefficients could be varied independently of the amplitudes and frequencies of the superimposed oscillations. The modulated blowing was a major factor in improving the performance of the airfoil at much lower energy inputs than was hitherto known.

Original languageEnglish (US)
Pages (from-to)2052-2060
Number of pages9
JournalAIAA Journal
Volume31
Issue number11
StatePublished - Nov 1993

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Blow molding
Boundary layers
Airfoils
Hinges
Momentum
Experiments

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Siefert, A., Bachar, T., Koss, D., Shepshelovich, M., & Wygnanski, I. J. (1993). Oscillatory blowing: A tool to delay boundary-layer separation. AIAA Journal, 31(11), 2052-2060.

Oscillatory blowing : A tool to delay boundary-layer separation. / Siefert, A.; Bachar, T.; Koss, D.; Shepshelovich, M.; Wygnanski, Israel J.

In: AIAA Journal, Vol. 31, No. 11, 11.1993, p. 2052-2060.

Research output: Contribution to journalArticle

Siefert, A, Bachar, T, Koss, D, Shepshelovich, M & Wygnanski, IJ 1993, 'Oscillatory blowing: A tool to delay boundary-layer separation', AIAA Journal, vol. 31, no. 11, pp. 2052-2060.
Siefert A, Bachar T, Koss D, Shepshelovich M, Wygnanski IJ. Oscillatory blowing: A tool to delay boundary-layer separation. AIAA Journal. 1993 Nov;31(11):2052-2060.
Siefert, A. ; Bachar, T. ; Koss, D. ; Shepshelovich, M. ; Wygnanski, Israel J. / Oscillatory blowing : A tool to delay boundary-layer separation. In: AIAA Journal. 1993 ; Vol. 31, No. 11. pp. 2052-2060.
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