저소음형 축류 팬 개발을 위한 수치해석 연구PartⅡ : 팬의 주파수 별 음압 분포
Numerical Study on Development of Low Noise Axial FanPartⅡ : Sound Pressure Level Distribution for Frequency of Fan
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PartI of this paper identified the location and size of the noise sources from the axial flow fans, and partII based on that, identified the magnitude of sound pressure from the case and the blade according to frequency in the range of 2200 Hz to 5000 Hz. The equation of Lighthill was used for calculation. Generally, when measuring noise, the analytical area was extended more than 1m from the outlet of the fan. To eliminate the effects of backflow coming from the rear of the fan, the analytical area was extended a little longer than 1m. From the results of the analysis, high noise occurs in the low frequency area, and the lower noise becomes in the high frequency area. The maximum sound pressure generated in the range of 2000Hz~5000Hz is 65dB at a distance of 1m and 82dB at the outlet of the fan. Noise of the fan mainly occurred around the blade and guide, and the noise decreased as the frequency increased between 2200Hz and 3400Hz, but the noise increased as the frequency increased between 3800Hz and 5000Hz.
Abstract
PartI of this paper identified the location and size of the noise sources from the axial flow fans, and partII based on that, identified the magnitude of sound pressure from the case and the blade according to frequency in the range of 2200 Hz to 5000 Hz. The equation of Lighthill was used for calculation. Generally, when measuring noise, the analytical area was extended more than 1m from the outlet of the fan. To eliminate the effects of backflow coming from the rear of the fan, the analytical area was extended a little longer than 1m. From the results of the analysis, high noise occurs in the low frequency area, and the lower noise becomes in the high frequency area. The maximum sound pressure generated in the range of 2000Hz~5000Hz is 65dB at a distance of 1m and 82dB at the outlet of the fan. Noise of the fan mainly occurred around the blade and guide, and the noise decreased as the frequency increased between 2200Hz and 3400Hz, but the noise increased as the frequency increased between 3800Hz and 5000Hz.
참고문헌 (5)
- Ministry of Environment, "Guidelines for Emergency Reduction of High Concentration Fine dust", ~ (2019)
- Keuntae Park, "Application of a casing fence for the improvement of the aerodynamic and aeroacoustic performances of an axial flow fan", The Korean Society of Mechanical Engineers, pp.513~517 (2017)
- 전완호, "축류팬의 비정상 유동과 유동소음에 관한 연구", 한국전산유체공학회지, 22(2), pp.51~58 (2017), 한국전산유체공학회[DOI]
- LIGHTHILL, Michael James, "On sound generated aerodynamically I. General theory", Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 211(1107), pp.564~587 (1952)
- LIGHTHILL, Michael James, "On sound generated aerodynamically II. Turbulence as a source of sound", Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 222(1148), pp.1~32 (1954)