The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
권호 표지
DOI QR코드

DOI QR Code

Development of high performance and low noise axial-flow fan for cooling machine room of refrigerator using airfoil-cascade analysis and surface ridge shape

익렬 분석 및 표면 돌기 형상을 이용한 냉장고 기계실 냉각용 고성능/저소음 축류팬 개발

  • Received : 2020.08.28
  • Accepted : 2020.10.23
  • Published : 2020.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

This study aims to improve the flow and noise performances of an axial-flow fan for cooling the machine room in a refrigerator by using airfoil-cascade analysis and surface ridge shape. First, the experimental evaluations using a fan performance tester and an anechoic chamber are performed to analyze the flow and noise performances of the existing fan system. Then, the corresponding flow and noise performances are numerically assessed using the Computational Fluid Dynamics (CFD) techniques and the Ffowcs-Williams and Hawkings (FW-H) equation, and the validity of numerical results are confirmed through their comparisons with the experimental results. The analysis for the flow of a cascade of airfoils constructed from the existing fan blades is performed, and the pitch angles for the maximum lift-to-drag ratio are determined. The improved flow performance of the new fan applied with the optimum pitch angles is confirmed. Then, the fan blades with surface ridges on their pressure sides are devised, and the reduction of aerodynamic noise of the ridged fan is numerically confirmed. Finally, the prototype of the final fan model is manufactured, and improvements in the flow and noise performances of the prototype are experimentally confirmed.

본 연구의 목표는 냉장고 기계실 냉각용 축류팬을 대상으로 익렬 분석법과 표면 돌기 형상을 이용하여 유량과 소음 성능을 향상시키는 것이다. 먼저 기존 팬 시스템의 유동 및 소음 성능을 팬 성능 시험기와 무향실에서 실험적으로 평가하였다. 다음으로 전산유체역학과 Ffowcs-Williams and Hawkings(FW-H) 방정식을 연계한 수치해석을 이용하여 유량과 소음 성능을 예측하였으며 실험 결과와의 비교를 통해 그 유효성을 검증하였다. 검증된 수치해석기법을 기반으로 유량 성능을 향상시키기 위하여 기존 팬으로부터 추출된 익형들로 구성한 2차원 익렬의 유동 성능 분석을 수행하고 양항비를 최대화할 수 있는 피치각을 도출하였다. 최적 피치각이 적용된 축류팬의 수치해석을 실시하여 향상된 유량 성능을 확인하였다. 향상된 유량 성능을 바탕으로 추가적인 소음 성능을 개선하기 위해 표면 돌기 형상을 팬 압력면에 적용한 팬 날개를 도출하였으며 수치적으로 유동 소음의 저감을 확인하였다. 마지막으로 유량 및 소음 성능 개선 축류팬을 제작하여 검증 실험을 통해 유량 및 소음 성능이 향상됨을 확인하였다.

Keywords

References

  1. S. Lee, S. Heo, C. Cheong, S. Kim, and M. Seo, "Computation of internal BPF noise of axial circulaitng fan in refrigerators," Trans. Korean Soc. Noise Vib. Eng. 19, 454-461 (2009). https://doi.org/10.5050/KSNVN.2009.19.5.454
  2. G. Ren, S. Heo, C. Cheong, and T. Kim, "Response surface method based optimization of the shroud of an axial cooling fan for high performance and low noise," J. Mechanical Science and Technology, 27, 33-42 (2012). https://doi.org/10.1007/s12206-012-1220-y
  3. G. Feng, C. Cheong, and T. Kim, "Development of lownoise axial cooling fans in a household refrigeraotr," J. Mechanical Science and Technology, 25, 2995-3004 (2011). https://doi.org/10.1007/s12206-011-0818-9
  4. S. Ryu, S. Kim, C. Cheong, J. Kim, B. Park, and S. Park, "Optimization of flow performance by designing orifice shape of outdoor unit of air-conditioner" (in Korean), J. Acoust. Soc. Kr. 36, 371-377 (2017).
  5. D. Shin, S. Heo, C. Cheong, T. Kim, and J. Jung, "Performance/noise optimization of centrifugal fan using response surface method," Trans. Korean Soc. Noise Vib. Eng. 41, 165-172 (2017).
  6. D. Shin, S. Heo, C. Cheong, T. Kim, and J. Jung, "Development of high-performance/low-noise centrifugal fan circulating cold air inside a household refrigeraotr by reduction of vortex flow," Trans. Korean Soc. Noise Vib. Eng. 26, 428-435 (2016). https://doi.org/10.5050/KSNVE.2016.26.4.428
  7. S. Heo, C. Cheong, and T. Kim, "Development of low-noise centrifugal fans for a refrigerator using inclined S-shaped trailing edge," Int. J. Refrigeration, 34, 2076-2091 (2011). https://doi.org/10.1016/j.ijrefrig.2011.07.003
  8. J. Choi, S. Ryu, C. Cheong, M. Kim, and K. Lee, "Blade shape optimization of centrifugal fan for improving performance and reducing aerodynamic noise of clothes dryer" (in Korean), J. Acoust. Soc. Kr. 38, 321-327 (2019).
  9. S. Kim, S. Heo, C. Cheong, and T. Kim, "Numerical and experimental investigation of the bell-mouth inlet design of a centrifugal fan for higher internal flow rate," J. Mechanical Science and Technology, 27, 2263-2273 (2013). https://doi.org/10.1007/s12206-013-0609-6
  10. J. Kim, S. Ryu, C. Cheong, and M. An, "Development of high performance and low noise compact centrifugal fan for cooling automotive seats" (in Korean), J. Acoust. Soc. Kr. 37, 396-403 (2018).