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Trapped acoustic waves in the potential core of subsonic jets

Towne, Aaron and Cavalieri, André V. G. and Jordan, Peter and Colonius, Tim and Jaunet, Vincent and Schmidt, Oliver T. and Brès, Guillaume A. (2016) Trapped acoustic waves in the potential core of subsonic jets. In: 22nd AIAA/CEAS Aeroacoustics Conference, 30 May-1 June 2016, Lyon, France. https://resolver.caltech.edu/CaltechAUTHORS:20190709-092100372

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Abstract

The purpose of this paper is to characterize and model waves that are observed within the potential core of subsonic jets and that have been previously detected as tones in the near-nozzle region. Using three models (the linearized Euler equations, a cylindrical vortex sheet, and a cylindrical duct with pressure release boundary conditions), we show that these waves can be described by linear modes of the jet and correspond to acoustic waves that are trapped within the potential core. At certain frequencies, these trapped waves resonate due to repeated reflection between end conditions provided by the nozzle and the streamwise contraction of the potential core. Our models accurately capture numerous aspects the potential core waves that are extracted from large-eddy-simulation data of a Mach 0.9 isothermal jet. Furthermore, the vortex sheet model indicates that this behavior is possible for only a limited range of Mach numbers that is consistent with previous experimental observations.


Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2016-2809DOIConference Paper
https://arc.aiaa.org/doi/10.2514/6.2016-2809PublisherConference Paper
ORCID:
AuthorORCID
Towne, Aaron0000-0002-7315-5375
Cavalieri, André V. G.0000-0003-4283-0232
Jordan, Peter0000-0001-8576-5587
Colonius, Tim0000-0003-0326-3909
Schmidt, Oliver T.0000-0002-7097-0235
Brès, Guillaume A.0000-0003-2507-8659
Additional Information:© 2016 by Aaron Towne, André V. G. Cavalieri, Peter Jordan, Tim Colonius, Vincent Jaunet, Oliver T. Schmidt, and Guillaume A. Brès. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 27 May 2016. AT and TC gratefully acknowledge support from the Office of Naval Research under contract N0014-11-1-0753. AVGC and PJ acknowledge support from the Science Without Borders program (project number A073/2013). OTS was supported by DFG grant no. 3114/1-1. The LES study was supported by NAVAIR SBIR project, under the supervision of Dr. John T. Spyropoulos. The main LES calculations were carried out on CRAY XE6 machines at DoD HPC facilities in ERDC DSRC.
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N0014-11-1-0753
Science Without BordersA073/2013
Deutsche Forschungsgemeinschaft (DFG)3114/1-1
Naval Air Systems Command (NAVAIR)UNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
AIAA Paper2016-2809
Record Number:CaltechAUTHORS:20190709-092100372
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190709-092100372
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96966
Collection:CaltechAUTHORS
Deposited By: Melissa Ray
Deposited On:10 Jul 2019 23:52
Last Modified:09 Mar 2020 13:18

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