Semi-Empirical Prediction of Noise from Non-Zero Pressure Gradient Turbulent Boundary Layers
Turbulent boundary layers with non-zero pressure gradients are present on almost all aerospace flight vehicles and radiate acoustic waves. A semi-empirical mathematical model is developed to predict acoustic radiation from non-zero pressure gradient turbulent boundary layers. The arguments of the mathematical model are the turbulent statistics and meanflow, which are numerically derived from steady Reynolds-averaged Navier-Stokes equations closed by an algebraic Reynolds stress model. Predictions are conducted for four subsonic Mach numbers and five non-dimensional pressure gradients. The turbulent statistics and meanflow relative to the zero pressure gradient boundary layer are quantified. Predictions of acoustic radiation are compared with a previously developed analytical model and a well validated large eddy simulation. Finally, relative changes of the power spectra for four Mach numbers and four non-dimensional pressure gradients are compared with corresponding zero-pressure gradient flows.
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Document Type: Research Article
Publication date: May 1, 2018
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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