Author/Editor		Holeček, Nikola; Širok, Brane; Hočevar, Marko; Podgornik, Rudolf
Title		Experimental research of aerodynamic noise induced by condenser of drying machine
Type		članek
Source		IJAV
Vol. and No.		Letnik 10, št. 1
Publication year		2005
Language		eng
Abstract		In this paper analyze the noise of aerodynamic sources induced by a drying machine condenser. Two condenser versions of identical external geometry that differ in the form of the flow channel in the direction of the secondary flow,were studied. We analyzed the integral and local aerodynamic and acousticcharacteristics of both condenser types. The measured far-field sound frequency spectra show essential differences between the two cases, discernible in the form and location of specific peaks superimposed on a generic power-law frequency spectrum. Recent theoretical advances in the Lighthill acoustic analogy were used to identify the generic part of the spectrum due to isotropic turbulence.The specific peaks in the spectrum are apparently due to different structural characteristics of the two studied versions of the condenser types. The measured characteristics of the power spectra were used to propose optimization strategies in the design of the acoustic properties of the drying machine condensers.