On the comparative effectiveness of steady blowing and suction used for separation and circulation control on an elliptical airfoil

Chunmei Chen, Roman Seele, Israel J. Wygnanski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

The relative effectiveness of blowing and suction in controlling separation and circulation is assessed in the present paper. The paper focuses on low momentum input where suction is much superior to blowing in generating lift and decreasing drag. Blowing is mostly deleterious at levels of input that result in the jet velocity being comparable to the free stream's velocity and this paper attempts to explain this effect. Furthermore, the significance of slot width, slot location and the bluntness of the trailing edge are discussed. The effectiveness of suction is generally improved by widening the slot, moving it downstream and reducing the bluntness of the trailing edge. The effectiveness of blowing is best realized when the slot is located near the natural separation point for the narrowest slot possible. There is a threshold input of momentum where blowing becomes more effective than suction. Most of the data presented was taken at incompressible speeds and at Re < 2.5*10 5.

Original languageEnglish (US)
Title of host publication40th AIAA Fluid Dynamics Conference
StatePublished - Dec 2 2010
Event40th AIAA Fluid Dynamics Conference - Chicago, IL, United States
Duration: Jun 28 2010Jul 1 2010

Publication series

Name40th AIAA Fluid Dynamics Conference

Other

Other40th AIAA Fluid Dynamics Conference
CountryUnited States
CityChicago, IL
Period6/28/107/1/10

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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    Chen, C., Seele, R., & Wygnanski, I. J. (2010). On the comparative effectiveness of steady blowing and suction used for separation and circulation control on an elliptical airfoil. In 40th AIAA Fluid Dynamics Conference [2010-4715] (40th AIAA Fluid Dynamics Conference).