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Parametric Study of Alternating Flow Patterns in Non-Reacting Multiple-Swirl Flows

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Abstract

Multiple nozzle combustors, under certain conditions, may result in flowfields that differ between nozzles in an alternating pattern. Previous work has provided some clues on the parameters which govern the appearance of this behavior, but there is a lack of systematic studies. A series of non-reacting simulations of adjacent swirling flows is used to investigate the effect of nozzle exit flare angle and swirl number on the presence of the alternating flow pattern. Two-nozzle simulations are shown to accurately predict if an asymmetric flow characteristic appears and are therefore used in the parametric investigation. Alternating flow patterns are predicted at nozzle exit flare angles of 105 degrees (for a swirl number of 0.79) and 120 degrees (for a swirl number of 0.69 and 0.79). Under conditions close to the stability boundary between symmetric and asymmetric flows, the nozzle exit flare and increased swirl number push the shear layers against the dome wall so that the flows between each nozzle are largely opposite in direction. An increase in nozzle exit flare above 120∘ results in separated flows exiting from the inlet and a return to a symmetric flow state. This is consistent with a proposed physical mechanism based on hydrodynamic stability in turbulent opposed jets.

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Authors and Affiliations

  1. University of Cincinnati, 2600 Clifton Ave, Cincinnati, OH, 45221, USA

    Brian Dolan, Rodrigo Villalva Gomez & Ephraim Gutmark

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  1. Brian Dolan
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  2. Rodrigo Villalva Gomez
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  3. Ephraim Gutmark
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Correspondence to Rodrigo Villalva Gomez.

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Dolan, B., Villalva Gomez, R. & Gutmark, E. Parametric Study of Alternating Flow Patterns in Non-Reacting Multiple-Swirl Flows. Flow Turbulence Combust 100, 437–455 (2018). https://doi.org/10.1007/s10494-017-9856-4

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  • DOI: https://doi.org/10.1007/s10494-017-9856-4

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