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Prediction of Specific Noise Based on Internal Flow of Forward Curved Fan

Sasaki, Soichi    (Department of Mechanical Systems Engineering, Nagasaki University   ); Hayashi, Hidechito    (Department of Mechanical Systems Engineering, Nagasaki University   ); Hatakeyama, Makoto    (Products R&D Department, TOTO LTD. Research Institute  );
  • 초록

    In this study, a prediction theory for specific noise that is the overall characteristic of the fan has been proposed. This theory is based on total pressure prediction and broadband noise prediction. The specific noises of two forward curved fans with different number of blades were predicted. The flow around the impeller having 120 blades (MF120) was more biased at a certain positions than the impeller with 40 blades (MF40). An effective domain of the energy conversion of MF40 has extended overall than MF120. The total pressure was affected by the slip factor and pressure loss caused by the vortex flow. The suppression of a major pressure drop by the vortex flow and expansion of the effective domain for energy conversion contributed to an increase in the total pressure of MF40 at the design point. The position of maximum relative velocity was different for each fan. The relative velocity of MF120 was less than that of MF40 due to the deviation angle. The specific noise of MF120 was 2.7 dB less than that of MF40 due to the difference in internal flow. It has been quantitatively estimated that the deceleration in the relative velocity contributed to the improvement in the overall performance.


  • 주제어

    Centrifugal Fan .   Internal Flow .   Wake .   Vortex .   Pressure Drop .   Aerodynamic Noise.  

  • 참고문헌 (15)

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    4. Velarde-Suarez, S., Santolaria-Morros, C., and Ballesteros-Tajadura, R., 1999, “Experimental Study on the Aeroacoustic Behavior of a Forward-Curved Blades Centrifugal Fan,” ASME Journal of Fluids Engineering, Vol. 121, No. 2, pp. 276-281. 
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    6. Velarde-Suarez, S., Ballesteros-Tajadura, R., Santolaria-Morros, C., and Pereiras-Garcia, B., 2008, “Reduction of theaerodynamic tonal noise of a forward-curved centrifugal fan by modification of the volute tongue geometry,” Applied Acoustics, Vol. 69, No. 3, pp. 225-232. 
    7. Sasaki, S., Kodama, Y., Hayashi, H., and Uto, T., 2006, “Influence of Solidity on Total Pressure Characteristic of a MultibladeFan, “ Turbomachinery ( in Japanese), Vol.32, No.12, pp. 739-747. 
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    10. Curle, N., 1955, “The Influence of the Solid Boundary upon Aerodynamic Sound,” Proceedings of Royal Society of London,A231, pp. 505-514. 
    11. Fukano, T. and Talukder, 1986, “A. A., Discrete Frequency Noise Generated form an Inclined Flat Plate Immersed in aUniform Oncoming Flow,” Transactions of the Japan Society of Mechanical Engineers, Series B ( in Japanese), Vol. 52, No. 480 ,pp. 2828-2836. 
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    13. Sasaki, S. and Kodama, Y., 2003, “The Standing Wake Formed in the Wake of a Flat Plate Blade and the Coherent Structure,”Journal of Japan Society of Fluid Mechanics (in Japanese), Vol. 22, No. 4, pp. 325-335. 
    14. Japanese Standards Association, 2005, “Glossary of terms for fans, blowers and compressors,” JIS B 0132 (in Japanese), p.459. 
    15. Sasaki, S., Hayashi, H., and Kodama, Y., “Application of Wake Characteristics to Prediction of Broadband Noise ofa Multiblade Fan,” Proceedings of the 9th Asian International Conference on Fluid Machinery, Jeju, Korea, No. AICFM9-133. 

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