Extraction of skin friction topology of turbulent wedges on a swept wing in transonic flow from surface temperature images

This paper describes a first-order approximate method of extracting the skin friction topology of turbulent wedges from temperature sensitive paint (TSP) images on a NASA Common Research Model with Natural Laminar Flow (CRM-NLF) wing at Mach 0.85 in the National Transonic Facility (NTF) for full-fli...

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Bibliographic Details
Published in:Experiments in fluids 2021-10, Vol.62 (10), Article 215
Main Authors: Liu, Tianshu, Salazar, David M., Crafton, Jim, Watkins, A. Neal
Format: Article
Language:English
Subjects:
Approximation
Base flow
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Fluid flow
Fluid- and Aerodynamics
Friction
Heat and Mass Transfer
Lagrange multiplier
Laminar flow
Research Article
Reynolds number
Skin friction
Spatial resolution
Surface temperature
Swept wings
Temperature-sensitive paints
Topology
Transonic flow
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Summary:This paper describes a first-order approximate method of extracting the skin friction topology of turbulent wedges from temperature sensitive paint (TSP) images on a NASA Common Research Model with Natural Laminar Flow (CRM-NLF) wing at Mach 0.85 in the National Transonic Facility (NTF) for full-flight Reynolds number testing. The extracted skin friction topology of a typical turbulent wedge exhibits the similarity in the distributions of the surface temperature, skin friction magnitude and skin friction divergence. The developed method computes a normalized skin friction field associated with a surface temperature variation superposed on a simple known base flow. The selection of the relevant parameters in the application of this method is discussed, including the base-flow power-law exponent, relative amplitude of the surface temperature variation to the base flow, Lagrange multiplier, spatial resolution, and filter size. Graphic abstract Surface temperature and skin friction fields of a typical turbulent wedge: (a) temperature, (b) skin friction magnitude, and (c) skin friction divergence. The color bar has no unit.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-021-03305-5