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Effect of the nature of vitiated crossflow on the flow-field of a transverse reacting jet

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Abstract

The effect of the nature of vitiated crossflow on the structure and dynamics of non-reacting/reacting transverse jets is investigated. In this study, the vitiated crossflow is produced either by a low-swirl burner (LSB) that adds a swirling component to the crossflow or a bluff-body burner (BBB) that produces a uniform crossflow. The jet fluid is injected through a contoured injector, which provides a top-hat velocity profile. The swirling crossflow exhibits considerable swirl at the point of injection of the transverse jet. Two component high-repetition-rate PIV measurements demonstrate the influence of a vitiated crossflow generated by a low-swirl/bluff-body burner on the near-wake flow-field of the jet. Measurements at a plane below the injection location of the jet indicate that there is a continuous entrainment of PIV particles in case of swirling crossflow. The time-averaged flow-field shows that the velocity field for reacting/non-reacting jets in the LSB crossflow exhibits higher velocity gradients, in the measurement plane along jet cross section, as compared to BBB crossflow. It is found that the vorticity magnitude is lower in case of jets in the BBB crossflow and there is a delay in the formation of the wake vortex structure. The conditional turbulent statistics of the jet flow-field in the two crossflows shows that there is a higher degree of intermittency related to the wake vortex structure in case of a BBB crossflow, which results in a non-Gaussian distribution of the turbulent statistics. The wake Strouhal number calculation shows the influence of the nature of crossflow on the rate of wake vortex shedding. The wake Strouhal number for the jets in BBB crossflow is found to be lower than for the LSB crossflow. A decrease in the wake Strouhal number is observed with an increase in the nozzle separation distance. There is an increase in the dilatation rate owing to heat release which results in higher wake Strouhal number for reacting jets as compared to non-reacting jets. The POD analysis of the reacting and non-reacting jets shows the wake vortex structures to be the dominant flow structures in this study. There is a redistribution of turbulent kinetic energy from the shear layer to the coherent wake vortex structure with an increase in the nozzle separation distance. The wake structures in the near-wake region of jets in LSB crossflow are found to have a larger contribution to the kinetic energy as compared to jets in BBB crossflow.

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Acknowledgements

The authors would like to thank Prof. Ann Karagozian for sharing the design details of the contoured injector. This work was supported by the United States Department of Energy under the University Turbine Systems Research (UTSR) Program, Grant Number DE-FE0007099, and by a subcontract through Siemens Energy on a prime contract from the United States Department of Energy, Advanced Hydrogen Turbine Development Program, Award Number DE-FC26-05NT42644.

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Authors and Affiliations

  1. Combustion Research Facility, Sandia National Laboratory, MS 9052, 7011 East Avenue, Livermore, CA, USA

    Pratikash P. Panda

  2. School of Mechanical Engineering, Purdue University, West Lafayette, IN, USA

    Oluwatobi Busari & Robert P. Lucht

  3. Siemens Energy, Orlando, FL, USA

    Walter R. Laster

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  1. Pratikash P. Panda
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  2. Oluwatobi Busari
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  3. Robert P. Lucht
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  4. Walter R. Laster
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Correspondence to Pratikash P. Panda.

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Panda, P.P., Busari, O., Lucht, R.P. et al. Effect of the nature of vitiated crossflow on the flow-field of a transverse reacting jet. Exp Fluids 58, 9 (2017). https://doi.org/10.1007/s00348-016-2288-4

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  • DOI: https://doi.org/10.1007/s00348-016-2288-4

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