Proceedings ArticleDOI
Boundary-layer transition and global skin friction measurement with an oil-fringe imaging technique
Daryl J. Monson,George G. Mateer,Florian R. Menter +2 more
- Vol. 95, pp 90054
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TLDR
In this article, a new oil-fringe imaging fkin friction (FISF) technique is presented to measure skin friction on wind tunnel models, where lines of oil are applied on surfaces that connect the intended sets of measurement points, and then a wind tunnel is run so that the oil thins and forms interference fringes that are spaced proportional to local skin friction.Abstract:
A new oil-fringe imaging fkin friction (FISF) technique to measure skin friction on wind tunnel models is presented In the method used to demonstrate the technique, lines of oil are applied on surfaces that connect the intended sets of measurement points, and then a wind tunnel is run so that the oil thins and forms interference fringes that are spaced proportional to local skin friction After a run the fringe spacings are imaged with a CCD-array digital camera and measured on a computer Skin friction and transition measurements on a two-dimensional wing are presented and compared with computational predictionsread more
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Journal ArticleDOI
Modern developments in shear-stress measurement ☆
TL;DR: In this article, three relatively modern categories of skin-friction measurement techniques are broadly classified as microelectromechanical systems (MEMS)-based sensors, oil-film interferometry, and liquid crystal coatings.
Journal ArticleDOI
Reynolds number effects on a turbulent boundary layer with separation, reattachment, and recovery
TL;DR: In this article, experimental studies of Reynolds number effects on a turbulent boundary layer with separation, reattachment, and recovery were conducted. And they showed that the mean flow is at most a very weak function of the Reynolds number while turbulence quantities strongly depend on Reynolds number.
Journal ArticleDOI
Skin-friction measurements on the NASA hump model
TL;DR: In this paper, the skin-friction distribution on a wall-mounted hump model has been obtained using oil-film interferometry, including measurements in reverse-flow and high-gradient regions.
Journal ArticleDOI
Global luminescent oil-film skin-friction meter
TL;DR: In this paper, a global luminescent oil-film skin-friction meter was developed based on the relationship between the oilfilm thickness and luminescence intensity of an oil film doped with luminecent molecules.
Journal ArticleDOI
Skin-friction measurements and calculations on a lifting airfoil
TL;DR: In this paper, a new technique for measuring skin friction was employed to help document the flow on an airfoil at angles of attack from -0.5 to 11.5 deg.
References
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Improved two-equation k-omega turbulence models for aerodynamic flows
TL;DR: In this article, two new versions of the k-omega two-equation turbulence model are presented, the baseline model and the Shear-Stress Transport model, which is based on the BSL model, but has the additional ability to account for the transport of the principal shear stress in adverse pressure gradient boundary layers.
Journal ArticleDOI
A study of the motion of oil films on surfaces in air flow, with application to the measurement of skin friction
L H Tanner,L G Blows +1 more
TL;DR: In this paper, a simple relation is obtained between the film thickness variation and the skin friction distribution, and the results confirm the theory and show that the method gives reasonably accurate measurements of skin friction distributions in low speed flows.
Proceedings ArticleDOI
An upwind differencing scheme for the time-accurate incompressible Navier-Stokes equations
Stuart E. Rogers,Dochan Kwak +1 more
TL;DR: In this paper, the Navier-Stokes equations are solved in a time-accurate manner in using the method of pseudocompressibility, where subiterations in pseudotime are required to satisfy the continuity equation at each time step.
Static and dynamic pressure measurements on a NACA 0012 airfoil in the Ames High Reynolds Number Facility
J. B. Mcdevitt,A. F. Okuno +1 more
TL;DR: In this paper, the supercritical flows at high subsonic speeds over a NACA 0012 airfoil were studied to acquire aerodynamic data suitable for evaluating numerical flow codes.
Journal ArticleDOI
A skin friction meter, using the viscosity balance principle, suitable for use with flat or curved metal surfaces (based on thickness measurement)
TL;DR: In this paper, a laser beam focused at position x, reflects partly from the oil surface and partly from a metal substrate, and the reflected beams are focused on a photocell and the pen recorder output gives an interferometric record of y against t.
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