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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.v1.i4.10

VISUALIZATION OF BOUNDARY LAYER TRANSITION BY VISCOUS OIL

Vladimir Evguenyevich Mosharov
Central Aero-Hydrodynamic Institute (TsAGI)
Vladimir Nikolaevich Radchenko
Central Aerohydrodynamic Institute (TsAGI), 1, Zhukovsky str., Zhukovsky, 140180, Moscow region

ABSTRACT

Particle Image Surface Flow Visualization method (PISFV) provides visualization of surface flow pattern using the small shift of viscous oil applied on the model surface. PISFV method provides not only the direction of oil shift (i.e. streamlines) but also the magnitude of oil film shift. If oil viscosity and oil film thickness in each point of the model surface are known the shear stress distribution can be determined. But even without precise knowledge of these parameters the boundary layer transition is clearly visualized on the model surface. Physical background of boundary layer transition visualization by PISFV method is discussed. Examples of boundary layer transition visualization at different flow parameters from subsonic to hypersonic flows are presented.