Mechanism of tonal noise generation from circular cylinder with spiral fin

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• 作者：Ryo Yamashita (1)
  Hidechito Hayashi (1)
  Tetsuya Okumura (1)
  Hiromitsu Hamakawa (2)
  
• 关键词：Aerodynamic ; Noise ; Aeolian Tone ; Karman Vortex ; Spiral Finned Tube
• 刊名：Journal of Thermal Science
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：23
• 期：6
• 页码：552-557
• 全文大小：1,222 KB
• 参考文献：1. Morfey, C. L.: Rotating Pressure Patterns in Ducts, Their Generation and Transmission, Journal of Sound and Vibration, vol.1, pp.60鈥?7, (1964). CrossRef
  2. Ziada, S., Vorticity shedding and acoustic resonance of tube bundles, Journal of the Brazilian Society of Mechanical Sciences and Engineering, 28, pp.186鈥?99, (2006). CrossRef
  3. ChVen, Y. N., Flow-induced Vibration and Noise in Tubebank Heat Exchangers due to Von Karman Streets, Transactions of ASME, Journal of Engineering for Industry, Series B, Vol. 94, pp. 134鈥?46, (1968).
  4. Weaver, D. S., Vortex shedding and acoustic resonance in heat exchanger tube arrays, In Technology for the 90鈥檚, ASME, pp.776鈥?10, (1993).
  5. Ziada, S., Oeng枚ren, A., Vortex shedding in an in-line tube bundle with large tube spacings, Journal of Fluids and Structures, 7, pp.661鈥?87, (1993). CrossRef
  6. Hamakawa, H., Fukano, T., Nishida, E., Vortex Shed ding from Spiral-Fin-Tube Banks, 6th AIAA/CEAS Aeroacoustics Conference(Lahaina, Hawaii), Paper No. 2000鈥?001, pp.1鈥?, (2000).
  7. Hamakawa, H., Fukano, T., Nishida, E., Aragaki, M., Vortex Shedding from a Circular Cylinder with Fin, 7th AIAA/CEAS Aeroacoustics Conference(Maastricht, The Netherlands), Paper No.2001 2215, pp.1鈥?, (2001).
  
• 作者单位：Ryo Yamashita (1)
  Hidechito Hayashi (1)
  Tetsuya Okumura (1)
  Hiromitsu Hamakawa (2)
  
  1. Department of Mechanical Engineering, Nagasaki University, 1-14 Bunkyo machi, Nagasaki, 852-8521, Japan
  2. Department of Mechanical Engineering, Oita University, 700 Dannoharu, Oita, 870-1192, Japan
  
• ISSN：1993-033X

文摘

The pitch of the spiral finned tube influences seriously to the acoustic resonance in the heat exchanger. In this research, the flow characteristics in relating to the aeolian tone from the finned cylinder are studied by the numerical simulation. It is observed that the tonal noise generated from the finned tube at two pitch spaces. The ratio of the fin pitch to the cylinder diameter is changed at 0.11 and 0.27. The tone level increases and the frequency decreases with the pitch shorter. The separation flow from the cylinder generates the span-wise vortices, Karman vortices, and the separation flow from the fin generates the stream-wise vortices. When the fin pitch ratio is small, the stream-wise vortices line up to span-wise and become weak rapidly. Only the Karman vortices are remained and integrate in span. So the Karman vortex became large. This causes the low frequency and the large aeolian tone.