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Flying-Hot-Wire Study of Flow Past an NACA 4412 Airfoil at Maximum Lift

Coles, Donald and Wadcock, Alan J. (1979) Flying-Hot-Wire Study of Flow Past an NACA 4412 Airfoil at Maximum Lift. AIAA Journal, 17 (4). pp. 321-329. ISSN 0001-1452. doi:10.2514/3.61127.

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Hot-wire measurements have been made in the boundary layer, the separated region, and the near wake for flow past an NACA 4412 airfoil at mad mum lift. The Reynolds number based on chord was about 1,500,000. Special care was taken to achieve a two-dimensional mean flow. The main instrumentation was a flying hot wire; that is, a hot-wire probe mounted on the end of a rotating arm. The probe velocity was sufficiently high to avoid the usual rectification problem by keeping the relative flow direction always within a range of ± 30 deg from the probe ads. A digital computer was used to control synchronized sampling of hot-wire data at closely spaced points along the probe arc. Ensembles of data were obtained at several thousand locations in the flowfield. The data include Intermittency, two components of mean velocity, and twelve mean values for double, triple, and quadruple products of two velocity fluctuations. No Information was obtained about the third (spanwise) velocity component. An unexpected effect of rotor interference was identified and brought under reasonable control. The data are available on punched cards in raw form and also after use of smoothing and interpolation routines to obtain values on a fine rectangular grid aligned with the airfoil chord. The data are displayed In the paper as contour plots.

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Additional Information:© 1978 American Institute of Aeronautics and Astronautics, Inc. Received June 19, 1978; presented as Paper 78-1196 at the AIAA 11th Fluid and Plasma Dynamics Conference, Seattle, Wash., July 10-12, 1978; revision received November 9, 1978. This research was supported by the Large-Scale Aerodynamics Branch, NASA Ames Research Center, Moffett Field, Calif., under Grants NGL 05-002-229 and NSG 2319.
Funding AgencyGrant Number
NASA Ames Research CenterNGL 05-002-229
NASA Ames Research CenterNSG 2319
Subject Keywords:Aerodynamics; Boundary Layers and Convective Heat Transfer-Turbulent; Viscous Nonboundary-Layer Flows
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AIAA Paper78-1196
Issue or Number:4
Record Number:CaltechAUTHORS:20130508-153946133
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Official Citation:Donald Coles and Alan J. Wadcock. "Flying-Hot-wire Study of Flow Past an NACA 4412 Airfoil at Maximum Lift", AIAA Journal, Vol. 17, No. 4 (1979), pp. 321-329. doi: 10.2514/3.61127
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38369
Deposited By: Tony Diaz
Deposited On:08 May 2013 23:50
Last Modified:09 Nov 2021 23:37

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