Abstract
This paper demonstrates a linear aeroacoustic simulation methodology to predict the whistling of an orice plate in a ow duct. The methodology is based on a linearized NavierStokes solver in the frequency domain with the mean ow eld taken from a ReynoldsAveraged Navier-Stokes (RANS) solution. The whistling potentiality is investigated via an acoustic energy balance for the in-duct element and good agreement with experimental data is shown. A Nyquist stability criterion based on the simulation data was applied to predict whistling of the orice when placed in a nite sized duct and experiments were carried out to validate the predictions. The results indicate that although whistling is a non-linear phenomena caused by an acoustic-ow instability feed-back loop, the linearized Navier-Stokes equations can be used to predict both whistling potentiality and a duct system’s ability to whistle or not.
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