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ACRC Technical Report 162PDF


Title:Modification of a Standard Aeroacoustic Valve Noise Model to Account for Friction and Two-Phase Flow
Author(s):Singh, G.M.; Rodarte, E.; Miller, N.R.; Hrnjak, P.S.
Subject(s):acoustic signal propagation
Abstract:This paper presents several modifications to the 1995 IEC standard model for predicting the aerodynamic noise generated by control valves in ideal gas. The modifications account for frictional pressure drop from the valve inlet to the point of maximum velocity within the valve as well as for the effect of two-phase flow on the aerodynamic noise generated by the valve and the subsequent attenuation downstream of the valve. The development of the standard model as well as the key assumptions and approximations made in the fundamental aero acoustic equations of Lighthill and Curle (upon which the standard model is based) are examined in justification ofthe presented modifications. Experimental results for expansion devices in refrigerant are given which support the presented modifications and experimental results for two-phase attenuation in tubes are also presented.
Issue Date:2000-04
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-162
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Project 72
Date Available in IDEALS:2009-05-26

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