WAVE-PROPAGATION AND ATTENUATION IN HERSCHEL-VENTURI TUBES

Wave propagation and attenuation in a classical flow metering device, the Herschel-Venturi tube, is investigated analytically and experiment ally. The analytical results are shown to compare well with the experi mental observations for anechoically terminated Herschel-Venturi tubes . In the absence of flow, the Taylor series approximations to the gove rning differential equations and the stepwise expansion and contractio n method are shown to be identical. The effect of mean flow on the wav e attenuation performance of Herschel-Venturi tubes is also studied in terms of a solution obtained by the Runge-Kutta method, and the appli cability of the stepwise expansion and contraction method is discussed with the mean flow through the duct. (C) 1997 Acoustical Society of A merica.