In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 84, No. S1 ( 1988-11-01), p. S116-S117
Abstract:
The pure tone generated from a cylinder's wake with a Karman vortex in the airflow is the basic phenomenon of aerodynamic sound and is also the sound that is often generated by flows of wind around constructions and the inner flow of turbomachinery. By putting another crossing cylinder into contact with the first, the Karman-vortex sound becomes quieter than for a single cylinder [Maruta et al., Proc. Internoise 87, 481–484 (1987)]. This phenomenon was investigated experimentally by changing the diameters, space, and crossing angle between the two cylinders. For cylinders with the same diameter, normal crossing was more effective for this sound reduction. For the ones with different diameters, inclined crossing was more effective with space less than 1.5 times the upstream cylinder's diameter. The sound reduction results from the fact that the spanwise coherence of the Karman vortex from the upstream cylinder is prevented by crossing with other cylinders. The Karman-vortex sound can be controlled by the optimum condition of two crossing cylinders.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1988
detail.hit.zdb_id:
1461063-2
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