Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Optimization of Discharge Grille of Outdoor Unit of Air Conditioner

에어컨 실외기 토출그릴 형상 최적화

  • Received : 2011.09.02
  • Accepted : 2011.10.06
  • Published : 2011.11.10
Download PDF
⟨ Previous Next ⟩

Abstract

The aerodynamic and aeroacoustic performance of discharge grille of outdoor unit of air-conditioner was investigated in this study. Discharge grille is one of outdoor unit's important parts to affect the flow rate and Overall Sound Pressure Level(OSPL). New type of discharge grille was suggested based on the results of numerical simulation. To simulate the flow pattern near the propeller fan, commercial flow solver FLUENT was used. Sliding mesh method was used for rotating propeller fan and initial condition for unsteady model was calculated by Multiple Reference Frame(MRF) method. To minimize the interaction noise between fan blade wake and discharge grille, new discharge grille has radial rib which is aligned with trailing edge of fan blade. And inclined radial rib was adopted for reducing flow rate drop in discharge grille. The optimization of inclined angle of radial grille was performed experimentally.

Keywords

References

  1. Jang, C. M., Furukawa, M., and Inoue, M., 2001, Analysis of vortical flow field in a propeller fan by LDV measurements and LES-Part 1：Threedimensional vortical flow structures, Journal of Fluids Engineering-Transactions of the ASME, Vol. 123, pp. 748-754. https://doi.org/10.1115/1.1412565
  2. Jang, C. M., Furukawa, M., and Inoue, M., 2001, Analysis of vortical flow field in a propeller fan by LDV measurements and LES-Part II： Unsteady nature of vortical flow structures due to tip vortex breakdown, Journal of Fluids Engineering-Transactions of the ASME, Vol. 123, pp. 755-761. https://doi.org/10.1115/1.1412566
  3. Jiang, C. L., Chen J. P., and Chen, Z. J., 2007, Experimental and numerical study on aeroacoustic sound of axial flow fan in room air conditioner, Applied Acoustics, Vol. 68, pp. 458-472. https://doi.org/10.1016/j.apacoust.2005.12.011
  4. Jie, T., Hua, O., and Yadong, W., 2009, ExperiExperimental and numerical study on aerodynamic noise of outdoor unit of room air conditioner with different grilles, International Journal of Refrigeration, Vol. 32, pp. 1112-1122. https://doi.org/10.1016/j.ijrefrig.2008.07.009
  5. Fluent Version 5.0 Users Manual, Fluent Inc.
  6. Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Taylor and Francis.
  7. Envia, E. and Nallasamy, M., 1999, Design selection and analysis of a swept and leaned stator concept, Journal of Sound and Vibration, Vol. 228, No. 4, pp. 793-836. https://doi.org/10.1006/jsvi.1999.2441
  8. Morfey, C. L., 1970, Sound generation in subsonic turbomachinery, J. Basic Eng., Vol. 92D, 450-458.
  9. Chen, M. Z. and Wu, X. H., 1999, Vortex simulation of rotor/stator interaction in turbomachiney, Trans. ASME, Vol. 121, pp. 358-364.