Trapped acoustic waves in the potential core of subsonic jets
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.
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.Attached Files
Published - TowneCavalieriJordanEtAl2016.pdf
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Additional details
- Eprint ID
- 96966
- Resolver ID
- CaltechAUTHORS:20190709-092100372
- N0014-11-1-0753
- Office of Naval Research (ONR)
- A073/2013
- Science Without Borders
- 3114/1-1
- Deutsche Forschungsgemeinschaft (DFG)
- Naval Air Systems Command (NAVAIR)
- Created
-
2019-07-10Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field
- Other Numbering System Name
- AIAA Paper
- Other Numbering System Identifier
- 2016-2809