Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2004.04a
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- Pages.1921-1926
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- 2004
Aeroacoustic Characteristics of Cavity Resonance on Very Low Subsonic Flows
저아음속 유동에 놓여진 개방형 공동의 공력소음 특성
- Koh, Sung-Ryong (Korea University Graduate School) ;
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Moon, Young-June
(Korea University, Dept. of Mechanical Engineering)
- Published : 2004.04.28
Abstract
The tone generation mechanism and aeroacoustic characteristics have been investigated for flow over open cavities using direct acoustic numerical simulations. Physically the tone generation mechanism of open cavity is more complicated when flow instabilities are excited by the correlation effects of flow parameters. From non-dimensional parameter studies in very low Mach number range, it is shown that characteristics of cavity resonance inherently involve typical acoustic pattern at each discrete tone frequency, and especially in laminar flow the fundamental tone frequency is determined within flow instability criterion of laminar shear layer as well as cavity geometry, length to depth ratio.