A near-field investigation of a supersonic, multi-stream jet: Locating turbulence mechanisms through velocity and density measurements

Andrew S. Magstadt, Matthew G. Berry, Thomas J. Coleman, Patrick R. Shea, Mark N. Glauser, Christopher J. Ruscher, Sivaram Gogineni, Barry V. Kiel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

18 Scopus citations

Abstract

An experimental investigation into the flow-field of a modern jet nozzle has been carried out. Even in canonical flows (e.g. axisymmetric jets), turbulence and its consequences are not fully understood. For composite flows that are becoming more prevalent in the aerospace industry, the fluid mechanics have been studied even less sufficiently. The characteristics of a supersonic, complex, rectangular jet are therefore investigated via schlieren and PIV data. A large-window PIV system measures planar data, and a time-resolved schlieren instrument captures events of the flow at acquisition rates up to 400 kHz. As an initial investigation into this rich flow-field, the study focuses on probing the flow to find regions of interest, with particular attention given to identifying coherent structures, shear layers, and shock structures. Spectra of the data are computed and a dominant frequency of 34 kHz is universally identified throughout the experimental domain. Proper Orthogonal Decomposition (POD) is additionally used to extract coherent structures in the flow and to help explain where the unique signal may be coming from. Evidence is presented that suggest Kelvin-Helmholtz instabilities generated inside the nozzle may be forcing this high-frequency signal that is seen throughout the flow-field and in the far-field acoustics.

Original languageEnglish (US)
Title of host publication54th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103933
DOIs
StatePublished - Jan 1 2016
Event54th AIAA Aerospace Sciences Meeting, 2016 - San Diego, United States
Duration: Jan 4 2016Jan 8 2016

Publication series

Name54th AIAA Aerospace Sciences Meeting
Volume0

Other

Other54th AIAA Aerospace Sciences Meeting, 2016
CountryUnited States
CitySan Diego
Period1/4/161/8/16

ASJC Scopus subject areas

  • Aerospace Engineering

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    Magstadt, A. S., Berry, M. G., Coleman, T. J., Shea, P. R., Glauser, M. N., Ruscher, C. J., Gogineni, S., & Kiel, B. V. (2016). A near-field investigation of a supersonic, multi-stream jet: Locating turbulence mechanisms through velocity and density measurements. In 54th AIAA Aerospace Sciences Meeting (54th AIAA Aerospace Sciences Meeting; Vol. 0). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2016-1639