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Visualization of Mechanical Processes: An International Online Journal


ISSN Online: 2152-209X

Visualization of Mechanical Processes: An International Online Journal

DOI: 10.1615/VisMechProc.2017019699

PARTICLE IMAGE SURFACE FLOW VISUALIZATION: STEP TO SKIN-FRICTION MEASUREMENT

Vladimir Evguenyevich Mosharov
Central Aerohydrodynamic Institute (TsAGI), 1, Zhukovsky Str., Zhukovsky, Moscow Region, 140180, Russian Federation
Vladimir Nikolaevich Radchenko
Central Aerohydrodynamic Institute (TsAGI), 1, Zhukovsky str., Zhukovsky, 140180, Moscow region, Russia
Nikolai Tsipilev
Moscow Institute of Physics and Technology

ABSTRACT

Particle image surface flow visualization (PISFV) consists of measuring the velocity field of thin oil-film movement on the model surface in external gas flow. Surface streamlines and wall shear stress (skin-friction) field can be calculated from this velocity field. Surface streamlines are restored from velocity direction distribution. To calculate the shear stress field it is necessary also to know the velocity value, oil-film thickness, and oil dynamic viscosity in each point of the model surface. Particle distribution inside the oil layer and the oil rheology can affect the accuracy of skin-friction measurements. The aim of the present work is to investigate the opportunity of wall shear stress field measurement by the PISFV method. Flat plate in the subsonic flow with a known surface wall shear stress is used to test the method. A linear relationship between the measured oil (particle) shift and shear stress values in a wide range of oil thicknesses and oil shifts suggests the possibility of skin-friction measurements


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