《JSV-CAA-2016-A review of time domain impedance modelling and applications》.pdf

Journal of Sound and Vibration 330 (2011) 3859–3873 Contents lists available at ScienceDirect Journal of Sound and Vibration journal homepage: /locate/jsvi A review of time-domain impedance modelling and applications $ ¨ Christoph Richter , Junis Abdel Hay, Łukasz Panek, Norbert Schonwald, Stefan Busse, Frank Thiele ¨ Technische Universitat Berlin, Institute of Fluid Mechanics and Engineering Acoustics, Germany a r t i c l e i n f o a b s t r a c t Article history: Time-domain impedance boundary conditions are reviewed and similarities between Accepted 11 April 2011 the models are shown. The extended Helmholtz resonator model is used with a time- Handling Editor: J. Astley domain impedance boundary condition for impedance eduction and simulation of the Available online 5 May 2011 noise radiation from a lined aeroengine nozzle. Model parameters obtained by impedance eduction from flow duct measurements and then used to predict the noise radiation for realistic aeroengine nozzle flow and geometry. The prediction of sound radiation from a coaxial jet nozzle at approach conditions with the educed model parameters is performed in 2D and 3D. Various features of the numerical method that