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On the Vortex Sound from Rotating RodsThe motion of different bodies imersed in liquid or gaseous media is accompanied by characteristic sound which is excited by the formation of unstable surfaces of separation behind the body, usually disintegrating into a system of discrete vortices(such as the Karman vortex street due to the flow about an infintely long rod, etc.).In the noise from fans,pumps,and similar machtnery, vortexnQif3eI?Yequently predominates. The purpose of this work is to elucidate certain questions of the dependence ofthis sound upon the aerodynamic parameters and the tip speed of the rotating rods,or blades. Although scme material is given below,insufficientto calculate the first rough approximation to the solution of this question,such as the mechanics of vortex formation,never the less certain conclusions maybe found of practical application for the reduction of noise from rotating blades.
Document ID
20030065895
Acquisition Source
Langley Research Center
Document Type
Other - NACA Technical Memorandum
Authors
Yudin, E. Y. (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 1947
Publication Information
Publication: Zhurnal Tekhnicheskoi Fiziki
Volume: 14
Issue: 9
Subject Category
Aerodynamics
Report/Patent Number
NACA-TM-1136
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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