Considered is a cylinder channel with a single row of ten aligned impinging jets, with exit flow in the axial direction at one end of the channel. For the present predictions, an unsteady Reynolds-Averaged Navier–Stokes (RANS) solver is employed for predictions of flow characteristics within and nearby the ten impingement jets, where the jet Reynolds number is 15,000. Spectrum analysis of different flow quantities is also utilized to provide data on associated frequency content. Visualizations of three-dimensional, unsteady flow structural characteristics are also included, including instantaneous distributions of Y-component vorticity, three-dimensional streamlines, shear layer parameter , and local static pressure. Kelvin–Helmholtz vortex development is then related to local, instantaneous variations of these quantities. Of particular importance are the cumulative influences of cross flows, which result in locally increased shear stress magnitudes, enhanced Kelvin–Helmholtz vortex generation instabilities, and increased magnitudes and frequencies of local flow unsteadiness, as subsequent jets are encountered with streamwise development.
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Research-Article
Unsteady Structure and Development of a Row of Impingement Jets, Including Kelvin–Helmholtz Vortex Development
Li Yang,
Li Yang
Department of Thermal Engineering,
Tsinghua University
,Beijing 100084
, China
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Phillip Ligrani,
Phillip Ligrani
Propulsion Research Center,
Department of Mechanical
and Aerospace Engineering,
Department of Mechanical
and Aerospace Engineering,
University of Alabama in Huntsville
,Huntsville, AL
35811
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Jing Ren,
Jing Ren
Department of Thermal Engineering,
e-mail: renj@tsinghua.edu.cn
Tsinghua University
,Beijing 100084
, China
e-mail: renj@tsinghua.edu.cn
Search for other works by this author on:
Hongde Jiang
Hongde Jiang
Department of Thermal Engineering,
Tsinghua University
,Beijing 100084
, China
Search for other works by this author on:
Li Yang
Department of Thermal Engineering,
Tsinghua University
,Beijing 100084
, China
Phillip Ligrani
Propulsion Research Center,
Department of Mechanical
and Aerospace Engineering,
Department of Mechanical
and Aerospace Engineering,
University of Alabama in Huntsville
,Huntsville, AL
35811
Jing Ren
Department of Thermal Engineering,
e-mail: renj@tsinghua.edu.cn
Tsinghua University
,Beijing 100084
, China
e-mail: renj@tsinghua.edu.cn
Hongde Jiang
Department of Thermal Engineering,
Tsinghua University
,Beijing 100084
, China
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 10, 2014; final manuscript received December 8, 2014; published online February 2, 2015. Assoc. Editor: Oleg Schilling.
J. Fluids Eng. May 2015, 137(5): 051201 (12 pages)
Published Online: May 1, 2015
Article history
Received:
July 10, 2014
Revision Received:
December 8, 2014
Online:
February 2, 2015
Citation
Yang, L., Ligrani, P., Ren, J., and Jiang, H. (May 1, 2015). "Unsteady Structure and Development of a Row of Impingement Jets, Including Kelvin–Helmholtz Vortex Development." ASME. J. Fluids Eng. May 2015; 137(5): 051201. https://doi.org/10.1115/1.4029386
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