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Effect of the Shape of a Guide Grill Above a Resonance Type Sound Absorbing Panel on Intake Flow into a Resonator

공명 흡음판 위 가이드 그릴의 형상이 공진기 흡입 유동에 미치는 영향

  • Bae, Hyunwoo (Graduate school, Department of Mechanical Engineering, Seoul National University of Science and Technology) ;
  • Sung, Jaeyoung (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Lee, Dong Hoon (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology)
  • Received : 2016.04.04
  • Accepted : 2016.06.14
  • Published : 2016.06.15

Abstract

This study investigates cavity flows through a guide grill above a resonator. Vortex distributions and intake flows are simulated for various shapes of the guide grill. The flows are assumed to be compressible, unsteady, and turbulent. Numerical simulations are conducted using a large eddy simulation (LES) model. To analyze the effect of the guide grill shape, three cavity lengths (0.2H, 0.6H, and 1.0H) and cavity angles ($30^{\circ}$, $45^{\circ}$ and $60^{\circ}$) are considered based on resonator height (H). The results show that the vortex generated in the resonator by cavity flow increases with cavity length. Thus, the intake flow is minimum at the smallest cavity length and angle. However, when cavity length is equal to resonator height, the intake flow decreases. The maximum intake flow occurs at a cavity angle $45^{\circ}$ at higher cavity lengths owing to the interaction between the vortex in the resonator and intake flow.

Acknowledgement

Supported by : 환경부

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