Proceedings of the Korean Society for Noise and Vibration Engineering Conference (한국소음진동공학회:학술대회논문집)
- 2005.11a
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- Pages.196-199
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- 2005
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- 1598-2548(pISSN)
Control of Sound Pressure Inside a Flow Excited Resonator
유동가진 공명기 내부의 음압 제어
- Hwang, Cheol-Ho ;
- Park, Jong-Beom (Herrick Labs. Mechanical Engineering, Purdue Univ.)
- Published : 2005.11.01
Abstract
Flow traveling over a cavity opening forms a vortex due to unstable shear layer and induces an aerodynamic pressure excitation from the diffusion of the vortex convecting out of the trailing edge of the opening. The interaction between the excitation force and the cavity response sustains resonance in the resonator(cavity) and locked-in vortex shedding at the leading edge of the opening. The aerodynamic excitation force can be described from the diffusion of the vortex over the trailing edge and the level of its diffusivity is related to the strength of vorticity seeded at the loading edge. In this study, the control scheme of the internal pressure oscillation was proposed from regulating the vorticity at the leading edge by use of an oscillating spoiler. It was found that the relative motion between the spoiler and the air mass at the cavity opening influenced vorticity strength and the control was achieved by direct feedback of the cavity pressure fluctuation to the actuator.
Keywords