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On the Wake and Drag of Bluff Bodies

Roshko, Anatol (1955) On the Wake and Drag of Bluff Bodies. Journal of the Aeronautical Sciences, 22 (2). pp. 124-132. ISSN 1936-9956.

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A modification to Kirchhoff's free streamline introduces the parameter k = √(1- C_ps), which allows arbitrary base pressure and which must depend on the dynamics of the wake. For a cylinder of given cross-sectional shape, the drag, C_D, and the wake width, d', are functions of k only. These functions are used to relate C_D and the dimensionless shedding frequency , S = nd/U_ ∞ to another number, S* = nd' / U_s, which is based on wake parameters. It is found that S* = 0.16 for all cylinders. In another approach, k is evaluated by using Karman's solution for the vortex street.

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Additional Information:© 1955 Institute of the Aeronautical Sciences. Presented at the Aerodynamics Session, Twenty-Second Annual Meeting, IAS, New York, January 25-29, 1954. The experiments reported were performed in the 20- by 20-in. low-turbulence wind tunnel at GALCIT. The major portion of this work was under the financial sponsorship of the National Advisory Committee for Aeronautics. The author is indebted to Dr. H. W. Liepmann, under whose program of general turbulence research the present investigation was conducted.
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National Advisory Committee for AeronauticsUNSPECIFIED
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Record Number:CaltechAUTHORS:20141202-134209863
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Official Citation:Anatol Roshko. "On the Wake and Drag of Bluff Bodies", Journal of the Aeronautical Sciences (Institute of the Aeronautical Sciences), Vol. 22, No. 2 (1955), pp. 124-132.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52280
Deposited By: George Porter
Deposited On:02 Dec 2014 22:13
Last Modified:03 Oct 2019 07:40

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