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Showing 1 to 20 of 157 for “"Skin Friction"”.
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Flow and skin friction over natural rough beds
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.
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Direct measurement of skin friction on magnetically levitated vehicles
… instrument for the direct measurement of skin friction on the surface of Magnetically Levitated (MagLev) trains was successfully achieved. A wall mounted, cantilevered beam device was used to measure the small tangential flow shear force that passes over the non-intrusive floating element. …
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Direct measurement of skin friction in complex supersonic flows
An instrument for the direct measurement of skin friction in complex supersonic and hypersonic flows was developed. The flows were complex because they were of very short duration, with high temperature and shocks and often injection, mixing, and combustion. A wall-mounted, miniature cantilevered …
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Floating head skin friction gage measurements in supersonic flows
Two floating head skin friction gages have been designed and tested to directly measure the skin friction coefficient for the undefined flow in a SCRAM-jet engine. The skin friction gage designs contain a floating head that is supported by ball bearings which allow it to move in any horizontal …
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Skin friction drag reduction in turbulent flows using superhydrophobic surfaces
… potential approach for the passive reduction of skinfriction on the hull of ships, submarines and underwater projectiles. When submerged in water, these surfaces trap a layer of air (or 'plastron') within their texture, which allows the external fluid to partially slip over the boundary, …
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Unsteady Skin-Friction Measurements on a Maneuvering Darpa2 Suboff Model
… a generic Suboff submarine model is studied. The skin-friction magnitudes are measured by using hot-film sensors each connected to a constant temperature anemometer. The local minima in the skin-friction magnitudes are used to obtain the separation locations. Steady static pressure measurements on …
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Study of Rubber Damped Skin Friction Gages for Transonic Flight Testing
A non-intrusive direct-measuring skin friction device with a rubber RTV sheet over the surface of the floating head, gap and housing was developed for application in 3D, unsteady, transonic flight conditions. Design conditions required optimum gage performance at altitudes ranging from 15,000 to …
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A Numerical Study of Internal Flow Effects on Skin Friction Gages
… flow characteristics of direct measuring skin friction gages with computational methods. This type of device uses a small movable head mounted flush to a wall such that the head is assumed to be exposed to the same shear stress from the flow as the surrounding wall. The force caused by the …
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A technique for direct measurement of skin friction in supersonic combustion flow
Federal employment law designed to assure equal employment opportunity for faculty has only been applicable to higher education since 1972. Prior to 1972, the higher education world, moreover, was immune from the most comprehensive federal employment law, Title VII of the Civil Rights Act of 1964. …
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A Study of Direct Measuring Skin Friction Gages for High Enthalpy Flow Applications
… design, analysis, and initial testing of a novel skin friction gage for applications in three-dimensional, high-speed, high-enthalpy flows. Design conditions required favorable gage performance in the Arc-Heated Facilities at Arnold Engineering Development Center. Flow conditions are expected to …
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A Study of Non-Fluid Damped Skin Friction Measurements for Transonic Flight Applications
A device was developed to directly measure skin friction on an external test plate in transonic flight conditions. The tests would take place on the FTF-II flight test plate mounted underneath a NASA F-15 aircraft flying at altitudes ranging from 15,000 to 45,000 ft. at Mach numbers ranging from …
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Skin friction measurements around a wing-body junction using oil- film laser interferometry
A direct, simple, and accurate way to measure skin friction by oil-film laser interferometry has been developed by various researchers. Equations and methods were developed to correct measurement errors arising from three-dimensional effects and pressure gradients. The oil-film, dual-beam laser …
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Study of A Direct Measuring Skin Friction Gage with Rubber Compounds for Damping
A study was conducted on the measurement of skin friction, the least under-stood component of drag. Skin friction is considered the "last frontier" in drag reduction for supersonic flight, but to understand skin friction, it must be accurately measured. This study utilized the direct measuring …
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Study of Skin Friction and Surface Regression Interaction via the Naphthalene Sublimation Technique
… specifically focusing on the effect that skin friction has on regression and vice versa. For this experimentation, a flat steel plate installed with three skin friction sensors was coated with naphthalene via a mechanized sprayer and was installed in the wall of the Ahmic Aerospace …
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Simultaneous direct measurements of skin friction and heat flux in a supersonic flow
A new gage which can measure skin friction and heat flux simultaneously was designed, constructed, and tested. This gage is the combination of a non-nulling type skin friction balance and a heat flux microsensor. By mounting the heat flux microsensor directly on the surface of the floating element …
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An Exploratory Study of the Application of Carbon Nanotubes to Skin Friction Measurements
… ranging from 50 - 90 psia. Two test runs gave skin friction values 3 - 20% lower than those values predicted by indirect measurement techniques before the sensor was damaged. While these first results are encouraging, further studies are clearly needed. Due to distinct anomalies in the …
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The development of instrumentation for the support of skin friction and heat flux measurements
… to process the signals from two types of skin friction gages and a microfabricated heat flux gage. Design changes for the skin friction gages are presented which will improve the performance of the two transducers. The instrumentation is simple in design and use and has been designed to …
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Negative skin friction on single piles in clay subjected to direct and indirect loading
… technique is developed to analyze the negative skin friction induced in single floating piles subjected to direct and indirect loading. The pile is embedded in saturated clay. The clay is subjected to surcharge pressure for generating indirect loading on the pile. The soil is assumed to behave …
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Skin Friction Sensor Design Methodology and Validation for High-Speed, High-Enthalpy Flow Applications
… the design, build, and testing of a new class of skin friction sensor capable of performing favorably in high-speed, high-enthalpy flow conditions, such as that found in atmospheric re-entry vehicles, scramjets, jet engines, material testing, and industrial processes. Fully understanding and …
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