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EXPERIMENTAL INVESTIGATION OF DRAG REDUCTION EFFECT IN WALL TURBULENCE OVER TRAVELINGWAVE-LIKE RUBBER SHEET

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Drag reduction effect in fully developed turbulent channel flow over traveling wave-like rubber sheet is investigated experimentally. An oscillator composing an amplified piezoelectric actuator generates a vibration of rubber sheet, which propagates in the downstream direction. The propagation of the wave is confirmed by laser displacement meters. A pressure difference over the wave at a downstream location decreases below that of a turbulent and laminar flows over a flat surface, while increases at upstream locations. A particle image velocimetry measurement clarifies the turbulent statistics. Decrease of a Reynolds shear stress is confirmed.

Author(s):

Yuho Ishiwata    
Tokyo University of Agriculture and Technology
Japan

Hiroya Mamori    
Tokyo University of Agriculture and Technology
Japan

Kaoru Iwamoto    
Tokyo University of Agriculture and Technology
Japan

Akira Murata    
Tokyo University of Agriculture and Technology
Japan