Experimental investigation into the turbulence flowfield of in-flight round jets
Experimental investigation into the turbulence flowfield of in-flight round jets
In this paper, insight is provided into the modeling of single-point and two-point statistics of a subsonic round jet discharged into a moving ambient medium. An experimental campaign has been performed comprising two round, unheated air flows: a central jet at Mach number equal to 0.6 surrounded by a slower flight flow. Constant-temperature hot-wire anemometry was used to measure both the axial and radial velocity fluctuations within the turbulent jet flowfield. A Mach 0.6 jet was discharged into the flight flow, which ranged from zero up to Mach 0.3. The data show that the degree to which the jet stretches with increasing flight velocity can be discerned with the knowledge of the decay of the mean velocity field downstream of the end of the jet’s potential core. This stretching factor can then be used to predict the changes in the static jet turbulence statistics for the in-flight case. Additionally, in the region of high-turbulence kinetic energy, the two-point statistics can be estimated using information about the single-point statistics and the local mean velocity. Empirical models for the in-flight jet’s shear stresses, cross-correlations, and power spectral density functions are presented and compared with those derived for the static jet case.
3339-3350
Proença, Anderson R.
575c4921-cf19-4301-bc7a-70a4432ea0df
Lawrence, Jack L. T.
59a5a96a-8824-4bae-a22a-739ad4ce9144
Self, Rod H.
8b96166d-fc06-48e7-8c76-ebb3874b0ef7
August 2020
Proença, Anderson R.
575c4921-cf19-4301-bc7a-70a4432ea0df
Lawrence, Jack L. T.
59a5a96a-8824-4bae-a22a-739ad4ce9144
Self, Rod H.
8b96166d-fc06-48e7-8c76-ebb3874b0ef7
Proença, Anderson R., Lawrence, Jack L. T. and Self, Rod H.
(2020)
Experimental investigation into the turbulence flowfield of in-flight round jets.
AIAA Journal, 58 (8), .
(doi:10.2514/1.J059035).
Abstract
In this paper, insight is provided into the modeling of single-point and two-point statistics of a subsonic round jet discharged into a moving ambient medium. An experimental campaign has been performed comprising two round, unheated air flows: a central jet at Mach number equal to 0.6 surrounded by a slower flight flow. Constant-temperature hot-wire anemometry was used to measure both the axial and radial velocity fluctuations within the turbulent jet flowfield. A Mach 0.6 jet was discharged into the flight flow, which ranged from zero up to Mach 0.3. The data show that the degree to which the jet stretches with increasing flight velocity can be discerned with the knowledge of the decay of the mean velocity field downstream of the end of the jet’s potential core. This stretching factor can then be used to predict the changes in the static jet turbulence statistics for the in-flight case. Additionally, in the region of high-turbulence kinetic energy, the two-point statistics can be estimated using information about the single-point statistics and the local mean velocity. Empirical models for the in-flight jet’s shear stresses, cross-correlations, and power spectral density functions are presented and compared with those derived for the static jet case.
Text
AIAA_PROENCA_IN_FLIGHT_JET_TURBULENCE
More information
Accepted/In Press date: 16 March 2020
e-pub ahead of print date: 13 April 2020
Published date: August 2020
Additional Information:
Funding Information:
A. R. Proenja would like to acknowledge financial support from the Coordenajao de Aperfeijoamento de Pessoal de Nivel Superior (CAPES) Foundation within the Brazilian Ministry of Education (Grant BEX-9333-13-4).
Publisher Copyright:
© 2020 by Anderson Proença. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
Identifiers
Local EPrints ID: 440953
URI: http://eprints.soton.ac.uk/id/eprint/440953
ISSN: 0001-1452
PURE UUID: 705eba04-8774-4953-a9fe-1a912fd42315
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Date deposited: 26 May 2020 16:30
Last modified: 16 Mar 2024 07:41
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Author:
Anderson R. Proença
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