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Noise Reduction of Circular and Non-Circular Jets Surrounded by Annular Swirl Flow

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An experimental study of the acoustic far field and flow field of co-axial circular and non-circular jets with the vane angles of 0° and 30° are presented in this paper. Flat vanes are fixed in the annular passage of the co-axial jets, which cause trailing edge vortices and/or swirl flow. The co-axial jets with vane angles of 0° and 30° almost eliminate the transonic tones and screech tones entirely, in contrast to non-swirl jet. The broadband shock associated noise is also mitigated by the co-axial jets, irrespective of the vane angles. The co-axial jets are efficient in overall noise suppression at both subsonic and supersonic conditions. The co-axial jets diminish the low frequency noise and enhance the high frequency noise. Reduction in core length is highest for the co-axial jets compared to the non-swirl jet. The flow visualization study also confirms that the co-axial jets weaken or destroy the shock cells and reduce the number of the shock cells compared to non-swirl jet.
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Document Type: Research Article

Publication date: September 1, 2017

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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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