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Experimental investigation of the transient bleed valve noise

Laffay, Paul and Jacob, Marc C. and Moreau, Stéphane and Regnard, Josselin Experimental investigation of the transient bleed valve noise. (2017) In: The 23rd AIAA/CEAS Aeroacoustics Conference, AIAA AVIATION Forum, 5 June 2017 - 9 June 2017 (Denver, United States).

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Official URL: https://doi.org/10.2514/6.2017-3528

Abstract

This study presents the first step of an experimental study of the transient bleed valve noise. It was carried out on a simplified TBV geometry composed of a cylindrical inlet pipe leading to a diaphragm or a perforated disk for the purpose of generating pressure drops. Numerous diaphragms and grids have been tested in order to identify parameters that influence the acoustic radiation of the TBV and for NPR (Nozzle pressure ratio) from 1.2 to 3.6 to cover both subsonic and supersonic regimes. A large number of acoustic behaviors have been identified. For diaphragms far field acoustic spectra are dominated by mixing noise for all NPR and by shock-associated noise (screech and broadband shock associated noise (BBSAN)) when the critical value of the NPR delimiting the subsonic and supersonic behavior (NPRc = 1.89)is exceeded. For grids the mixing noise is still present but is composed of two humps. The parametric study allowed to associate the first hump to the noise of an equivalent jet having the smallest diameter encircling the grid perforations while the second is associated to the noise of the outer isolated jets. A first prediction model has thus been proposed based on this double source. Furthermore, the grids other a significant noise reduction in the audible range with respect to a diaphragm of the same cross-section by shifting the radiation towards the high frequencies. The noise associated with supersonic phenomena (screech and BBSAN) are also strongly reduced and even suppressed in most of the tested cases.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to AIAA editor. The definitive version is available at : https://arc.aiaa.org/doi/abs/10.2514/6.2017-3528 eISBN: 978-1-62410-504-3
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > SAFRAN (FRANCE)
Other partners > Université de Lyon - UDL (FRANCE)
Other partners > Université de Sherbrooke (CANADA)
Laboratory name:
Laboratoire de Mécanique des Fluides et d'Acoustique - Centre Acoustique
Département Aérodynamique Energétique et Propulsion - DAEP (Toulouse, France) - Aérodynamique expérimentale
- Chaire Industrielle d'Aéroacoustique
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Deposited By: Marc C. JACOB
Deposited On:30 Mar 2018 13:54

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