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Showing 1 to 10 of 10 for “"Skin Friction Measurements"”.
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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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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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An Exploratory Study of the Application of Carbon Nanotubes to Skin Friction Measurements
… is bonded to a stationary substrate so that all measurements are relative to a fixed position. Arrays of carbon nanotubes were grown on bare 2 x 2 mm square silicon chips. The nanotubes were grown to heights of 75 microns with a thin layer of amorphous carbon on top. The silicon chips were then …
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Overview of the Skin Friction measurements on the NASA BeVERLI Hill using Oil Film Interferometry
… the Oil Film Interferometry (OFI) to estimate skin friction on the NASA/Virginia Tech BeVERLI (Benchmark Validation Experiment for RANS and LES Investigations) hill. This project aims to develop a detailed database of non-equilibrium, separated turbulent boundary layer flows obtained through …
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Design of Gages for Direct Skin Friction Measurements in Complex Turbulent Flows with Shock Impingement Compensation
This research produced a new class of skin friction gages that measures wall shear even in shock environments. One test specimen separately measured wall shear and variable-pressure induced moment. Through the investigation of available computational modeling methods, techniques for accurately …
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Design of a supersonic shock tunnel and experimental surface measurements
… being ambient air. Pressure and temperature measurements were made to document the operating conditions of the tunnel. Total pressure measurements were made in the settling chamber of the nozzle where the flow Mach number is 0.14 (weakly subsonic). Static pressure measurements were made at …
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Unsteady flow over a 6:1 prolate spheroid
… the spheroid flow field. The types of unsteady measurements performed include hot-film surface skin friction measurements, surface pressure measurements, and force and moment measurements. Unsteady measurements are much more difficult to perform than steady ones and require many special …
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Development of Measurement Methods for Application to a Wind Tunnel Test of an Advanced Transport Model
… in this work, both with the objective of making measurements on AMELIA for CFD validation. First, the work on the application of the Fringe-Imaging Skin Friction (FISF) technique to AMELIA is discussed. The FISF technique measures the skin friction magnitude and direction by applying oil droplets …
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Prototype Development and Feasibility Assessment of a Vertically Mounted Floating Element Skin Friction Balance
… in different experimental studies. The accurate measurements of wall shear stress will be instrumental in improving the existing empirical models and validating CFD models. Wall shear stress is also vital in improving fuel efficiency, heat transfer efficiency, and aerodynamic efficiency in …