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research-article

An experimental characterization of the interaction between two tandem planar jets in a crossflow

[+] Author and Article Information
Kun Zhao

State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Centre, Mianyang, Sichuan, China
kzhao@tcd.ie

Patrick Okolo

School of Engineering, Trinity College Dublin, University of Dublin, Dublin, Ireland
okolop@tcd.ie

Yong Wang

State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Centre, Mianyang, Sichuan, China
nudt604@aliyun.com

John Kennedy

School of Engineering, Trinity College Dublin, University of Dublin, Dublin, Ireland
kennedj@tcd.ie

Gareth J. Bennett

School of Engineering, Trinity College Dublin, University of Dublin, Dublin, Ireland
gareth.bennett@tcd.ie

1Corresponding author.

ASME doi:10.1115/1.4040224 History: Received January 31, 2018; Revised April 30, 2018

Abstract

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 2D-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 recognised 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 POD analysis was conducted, characterising 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.

Copyright (c) 2018 by ASME
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