Please use this identifier to cite or link to this item: http://hdl.handle.net/11189/6228
Title: Universal scaling laws on sound generated aerodinamically
Authors: Sun, BuHua 
Issue Date: Jul-2016
Publisher: Cape Peninsula University of Technology
Source: 23rd International Congress on Sound & Vibration Athens,Greece 10-14 July 2016
Conference: 23rd International Congress on Sound & Vibration 
Abstract: In 1952 and 1954, respectively, Sir James Lighthill derived a sound equation by an analogy approach and proposed a well-known U 8 power law for the the power of sound by using magnitude scale analysis. However, the Lighthill U 8 law breaks down at velocities when Mach number M > 1. In order to unify all the scaling laws of sound power, instead of using a Lighthill equation, an alternative way of using dimensional analysis has been proposed and a discovery of the universal power law of the power of sound has been founded as W = ρD2U 3f( c0 U ) = ρ0D2U 3f( 1 M ). As a special scenario, the scaling law for hypersonic flow has been obtained as W = Cρ0D2U 3 , which coincides with the experiments.
URI: http://hdl.handle.net/11189/6228
DOI: 10.13140/RG.2.2.35985.02400
Appears in Collections:Eng - Conference Papers

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