Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
권호 표지
DOI QR코드

DOI QR Code

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
Download PDF
⟨ Previous Next ⟩

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.

Keywords

References

  1. National Statistical Office, viewed 2015, Annual report on the amount of urban railway transportation, .
  2. Choi, J. K., Lee, J. W., Chang, I. S., 2001, A Study on Squeal Noise Control by Absorption Treatment in Urban Rail Transit System, T. KSNVE, 11:4 58-64.
  3. Lee, I. M., Choi, S. S., Park, B., 1994, Prediction and Control of Noise and Vibration in Building From Underground Rail Systems, J. KSRM, 4:2 77-86.
  4. Oh, Y. K., Kim, H. G., Lee, W., Y., 2004, Evaluation and Prediction of the Characteristics of Noise Reduction Depending on the Shapes of the Tunnel Section, JAIK, 20:8 177-84.
  5. Raghunathan, R. S., Kim, H. D., Setoguchi, T., 2002, Aerodynamics of High-speed Railway Train, Progress in Aerospace Science, 38:6-7 469-514. https://doi.org/10.1016/S0376-0421(02)00029-5
  6. Jang, K. S., Yoon, J. W., Kim, Y. C., Kim, D. H., 2001, The Study of the Experimental Evaluation for the Interference Device on the Noise Barrier Edge, KSNVE, 1 844-848.
  7. Howe, M. S., 2004, Mechanism of Sound Generation by Low Mach Number Flow over a Wall Cavity, JSV 273:1-2 103-123. https://doi.org/10.1016/S0022-460X(03)00644-8
  8. Alvarez, J. O., Kerschen, E. J., Tumin, A., 2004, A Theoretical Model of Cavity Acoustic Resonance in Subsonic Flow, AIAA J. 2004-2845.
  9. Erturk, E., Gokcol, O., 2007, Fine Grid Numerical Solutions of Triangular Cavity Flow, EPJ. Appl. Phy., 38:1 97-105. https://doi.org/10.1051/epjap:2007057
  10. Demirdzic, I., Lileka, Z., Peric, M., 1992, Fluid Flow And Heat Transfer Test Problems For Non-orthogonal Grids: Bench-mark Solutions, IJNM, 15 329-354.

Cited by

  1. 직선터널에서 지하철 열차의 교차운행 시 반사파 간섭에 따른 유동 특성 비교분석 vol.30, pp.3, 2018, https://doi.org/10.6110/kjacr.2018.30.3.123