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Research Papers: Gas Turbines: Turbomachinery

Flow Dynamics and Mixing of a Transverse Jet in Crossflow—Part II: Oscillating Crossflow

[+] Author and Article Information
Liwei Zhang

School of Aerospace Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: liwei@gatech.edu

Vigor Yang

William R. T. Oakes Professor and Chair
School of Aerospace Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: vigor.yang@aerospace.gatech.edu

1Corresponding author.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 14, 2016; final manuscript received December 20, 2016; published online March 21, 2017. Assoc. Editor: Riccardo Da Soghe.

J. Eng. Gas Turbines Power 139(8), 082602 (Mar 21, 2017) (13 pages) Paper No: GTP-16-1218; doi: 10.1115/1.4035809 History: Received June 14, 2016; Revised December 20, 2016

The present work extends Part I of our study to investigate the flow dynamics and scalar mixing of a turbulent gaseous jet in an oscillating crossflow. Attention is first given to intrinsic flow instabilities under a steady condition. Both power spectral density and proper orthogonal decomposition analyses are applied. For the case with a jet-to-crossflow velocity ratio of 4, the two most dynamic modes, corresponding to jet Strouhal numbers of around 0.1 and 0.7, are identified as being closely linked to the shear-layer vortices near the injector orifice and the vertical movement in the jet wake region, respectively. The effect of oscillation imposed externally in the upstream region of the crossflow is also examined systemically at a jet-to-crossflow velocity ratio of 4. A broad range of forcing frequencies and amplitudes are considered. Results reveal that the dominant structures observed in the case with a steady crossflow are suppressed by the harmonic excitations. Flapping–detaching motions, bearing the forcing frequencies and their subharmonics, become dominant as the forcing amplitude increases. The ensuing flow motions lead to the formation of a long, narrow jet plume and a relatively low mixing zone, which substantially alters the mixing efficiencies as compared to the case with a steady crossflow.

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References

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Figures

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Fig. 1

Schematic of the boundary configurations

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Fig. 2

Temporal evolution of isosurface of vorticity magnitude |Ω| = 1.0 × 105/s colored by scalar concentration: (a) steady crossflow, (b) case II: 5 kHz, 10%, and (c) case II-2: 5 kHz, 50%

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Fig. 3

Temporal evolution of scalar concentration in the jet-center plane: (a) steady crossflow, (b) case II: 5 kHz, 10%, and (c) case II-2: 5 kHz, 50%

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Fig. 4

PSD of instantaneous (a) pressure and (b) scalar concentration at three probe locations for the case with steady crossflow. Note that the very low-frequency spikes visible in the pressure field are the result of the finite sampling time and do not represent internal flow dynamics.

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Fig. 5

POD results for the fluctuating pressure in the jet-center plane: (a) steady crossflow, (b) case II: 5 kHz, 10%, and (c) case II-2: 5 kHz, 50%

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Fig. 6

POD results for the fluctuating scalar concentration in the jet-center plane: (a) steady crossflow, (b) case II: 5 kHz, 10%, and (c) case II-2: 5 kHz, 50%

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Fig. 7

POD results for the fluctuating pressure in the x/d = 10 plane: (a) steady crossflow, (b) case II: 5 kHz, 10%, and (c) case II-2: 5 kHz, 50%

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Fig. 8

PSD of fluctuating pressure at three locations: (a) 10% velocity oscillation at three frequencies and (b) three velocity oscillations at 5 kHz frequency

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Fig. 9

Time-averaged trajectories of the jet in the jet-center plane: (a) 10% velocity oscillation at three frequencies and (b) three velocity oscillations at 5 kHz frequency

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Fig. 10

Time-averaged scalar concentration in the jet-center and transverse planes: (a) steady crossflow, (b) case II: 5 kHz, 10%, and (c) case II-2: 5 kHz, 50%

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Fig. 11

Spatial evolution of mixing indices: (a) SMD and (b) TMD

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