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Flow Control on a Thick Airfoil Using Suction Compared to Blowing

Chen, Chunmei and Seele, Roman and Wygnanski, Israel (2013) Flow Control on a Thick Airfoil Using Suction Compared to Blowing. AIAA Journal, 51 (6). pp. 1462-1472. ISSN 0001-1452. doi:10.2514/1.J052098.

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The effects of steady slot suction as a means of controlling separation on a blunt elliptical airfoil were investigated and compared to the effects of steady blowing applied to the same airfoil previously investigated. Slots whose width approaches 1% of the chord and are located downstream of the natural separation location generate the highest lift for a given dimensionless mass-flow coefficient C_Q. This holds true whether the flow separates near the leading edge due to high incidence or near the trailing edge due to the bluntness of the airfoil and is contrary to the observations made when blowing was used. Lift generated by suction through a moderately wide slot located downstream of the natural separation line depends only on C_Q, but if the slot is located upstream of the separation line it depends on Reynolds number as well. Contrary to separation control by blowing no deleterious effects were observed at low levels of suction regardless of the suction-slot location. Adding a wedge to the blunt trailing edge of this airfoil enhances the effectiveness of suction, whereas making blowing less effective at low momentum inputs thus increasing the gap between these two approaches to flow separation.

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Additional Information:© 2012 American Institute of Aeronautics and Astronautics. Received 11 June 2012; revision received 30 November 2012; accepted for publication 4 December 2012; published online 1 March 2013. This research was supported by NASA under contract #NNX07AB73A. NASA has also donated some of the test equipment used in these experiments, and the help, advice, and interest of Anthony Washburn is much appreciated. The authors would also like to thank the work and effort put in by Boris Zakharin whose input significantly contributed to the success of this project.
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Issue or Number:6
Record Number:CaltechAUTHORS:20130712-135633249
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Official Citation:Chunmei Chen, Roman Seele, and Israel Wygnanski. "Flow Control on a Thick Airfoil Using Suction Compared to Blowing", AIAA Journal, Vol. 51, No. 6 (2013), pp.1462-1472. doi: 10.2514/1.J052098
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39347
Deposited By: Ruth Sustaita
Deposited On:12 Jul 2013 21:15
Last Modified:09 Nov 2021 23:44

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