Simulations of whistling and the whistling potentiality of an in-duct orifice with linear aeroacoustics |
| |
Authors: | A Kierkegaard S Allam G Efraimsson M Åbom |
| |
Institution: | 1. MWL Marcus Wallenberg Laboratory for Sound and Vibration Research, Stockholm, Sweden;3. Linné FLOW Centre, Stockholm, Sweden;4. CCGEx Competence Centre for Gas Exchange, Stockholm, Sweden;5. KTH Royal Institute of Technology, Department of Aeronautical and Vehicle Engineering, SE-100 44 Stockholm, Sweden |
| |
Abstract: | This paper demonstrates a linear aeroacoustic simulation methodology to predict the whistling of an orifice plate in a flow duct. The methodology is based on a linearized Navier–Stokes solver in the frequency domain with the mean flow field taken from a Reynolds-Averaged 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 orifice when placed in a finite sized duct and experiments were carried out to validate the predictions. The results indicate that although whistling is a nonlinear phenomena caused by an acoustic-flow 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. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|