한국가시화정보학회:학술대회논문집
- 한국가시화정보학회 2005년도 추계학술대회 논문집
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- Pages.17-22
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- 2005
국소적 초음파 가진이 난류경계층에 미치는 영향
Influence of Local Ultrasonic Forcing on a Turbulent Boundary layer
초록
An experimental study was carried out to investigate the effect of local ultrasonic forcing on a turbulent boundary layer. Stereoscopic particle image velocimetry (SPIV) was used to probe the characteristics of the flow. A ultrasonic forcing system was made by adhering six ultrasonic transducers to the local flat plate. Cavitation which generates uncountable minute air-bubbles having fast wall normal velocity occurs when ultrasonic was projected into water. The SPIV results showed that the wall normal mean velocity is increased in a boundary layer dramatically and the streamwise mean velocity is reduced. The skin friction coefficient (