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On the self-excited vibrations of bluff bodies suspended with a narrow clearance in a vertical pipe

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Abstract

The results of an experimental study of the flow past a sphere suspended with a narrow clearance in a circular cylindrical pipe and allowed only lateral movement, are presented. The study was limited to the case of intense vibrations accompanied by impacts between the sphere and the pipe wall. The experiments were conducted in steel and copper pipes at Reynolds numbers varying from 104 to 105 and several values of the sphere mass and the clearance between the sphere and the pipe wall. The self-excited vibration frequency was measured by a newly developed method based on registering the frequency only in the resonance modes which set in when the sphere and pipe vibration eigenfrequencies coincide. The flow was photographed and filmed at various values of the water flow rate. The major nondimensional parameters characterizing the phenomenon considered were revealed, and a universal relation between them and the nondimensional self-excited vibration frequency was established with acceptable accuracy.

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Authors
  1. V. P. Karlikov
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  2. N. T. Reznichenko
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  3. G. I. Sholomovich
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Additional information

Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 2, pp. 136–143, March–April, 2000.

The research was carried out with financial support from the Russian Foundation for Basic Research (project No. 98-01-00152).

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Karlikov, V.P., Reznichenko, N.T. & Sholomovich, G.I. On the self-excited vibrations of bluff bodies suspended with a narrow clearance in a vertical pipe. Fluid Dyn 35, 268–273 (2000). https://doi.org/10.1007/BF02831435

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  • DOI: https://doi.org/10.1007/BF02831435

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