This study reports an experimental investigation of two planar jets in a crossflow in a tandem arrangement. Tests were conducted in an open-jet wind tunnel facility using two-dimensional (2D)-particle imaging velocimetry (PIV) measurement. Using the terminology in the dual jets in a quiescent ambient, the mean flow field of the crossflow arrangement was divided into a converging region, a merging region, and a combined region. An approach to determining the range of these three regions was proposed based on the mean characteristics of horizontal velocity profiles of the flow field, validated by the experimental data. The momentum-dominated near field (MDNF) for the rear jet in the dual-jet configuration was recognized using the horizontal offset of mean jet trajectory, which accordingly gives a quantitative definition of the MDNF range. Discussions were made on the effects of different parameters on the three regions and MDNF. Finally, snapshot proper orthogonal decomposition (POD) analysis was conducted, characterizing the coherent structures of the flow field, particularly the large-scale vortices. It was observed that the large-scale vortices mainly occur in the shear layers of the jets and their occurrence is affected by the parameters of the jets. In addition, compared with the single-jet configuration, the introduction of the front jet was found to contribute to the occurrence and development of the large-scale vortices.
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November 2018
Research-Article
An Experimental Characterization of the Interaction Between Two Tandem Planar Jets in a Crossflow
Kun Zhao,
Kun Zhao
State Key Laboratory of Aerodynamics,
China Aerodynamics Research and
Development Centre,
Mianyang 621000, Sichuan, China
e-mail: kzhao@tcd.ie
China Aerodynamics Research and
Development Centre,
Mianyang 621000, Sichuan, China
e-mail: kzhao@tcd.ie
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Patrick N. Okolo,
Patrick N. Okolo
School of Engineering,
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: okolop@tcd.ie
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: okolop@tcd.ie
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Yong Wang,
Yong Wang
State Key Laboratory of Aerodynamics,
China Aerodynamics Research and
Development Centre,
Mianyang 621000, Sichuan, China
e-mail: nudt604@aliyun.com
China Aerodynamics Research and
Development Centre,
Mianyang 621000, Sichuan, China
e-mail: nudt604@aliyun.com
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John Kennedy,
John Kennedy
School of Engineering,
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: kennedj@tcd.ie
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: kennedj@tcd.ie
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Gareth J. Bennett
Gareth J. Bennett
School of Engineering,
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: gareth.bennett@tcd.ie
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: gareth.bennett@tcd.ie
Search for other works by this author on:
Kun Zhao
State Key Laboratory of Aerodynamics,
China Aerodynamics Research and
Development Centre,
Mianyang 621000, Sichuan, China
e-mail: kzhao@tcd.ie
China Aerodynamics Research and
Development Centre,
Mianyang 621000, Sichuan, China
e-mail: kzhao@tcd.ie
Patrick N. Okolo
School of Engineering,
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: okolop@tcd.ie
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: okolop@tcd.ie
Yong Wang
State Key Laboratory of Aerodynamics,
China Aerodynamics Research and
Development Centre,
Mianyang 621000, Sichuan, China
e-mail: nudt604@aliyun.com
China Aerodynamics Research and
Development Centre,
Mianyang 621000, Sichuan, China
e-mail: nudt604@aliyun.com
John Kennedy
School of Engineering,
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: kennedj@tcd.ie
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: kennedj@tcd.ie
Gareth J. Bennett
School of Engineering,
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: gareth.bennett@tcd.ie
Trinity College Dublin,
University of Dublin,
Dublin D02PN40, Ireland
e-mail: gareth.bennett@tcd.ie
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 31, 2018; final manuscript received April 30, 2018; published online June 5, 2018. Assoc. Editor: Pierre E. Sullivan.
J. Fluids Eng. Nov 2018, 140(11): 111106 (12 pages)
Published Online: June 5, 2018
Article history
Received:
January 31, 2018
Revised:
April 30, 2018
Citation
Zhao, K., Okolo, P. N., Wang, Y., Kennedy, J., and Bennett, G. J. (June 5, 2018). "An Experimental Characterization of the Interaction Between Two Tandem Planar Jets in a Crossflow." ASME. J. Fluids Eng. November 2018; 140(11): 111106. https://doi.org/10.1115/1.4040224
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