74th Annual Meeting of the APS Division of Fluid Dynamics (November 21, 2021 — November 23, 2021)

V0081: Dance of the sonic jets

  • Premika Susindran Thasu, Indian Institute of Science
  • Vaisakh Sasidharan, Indian Institute of Science
  • Sushmitha Janakiram, Indian Institute of Science
  • Subrahmanyam Duvvuri, Indian Institute of Science
DOI: https://doi.org/10.1103/APS.DFD.2021.GFM.V0081

Interaction between multiple jet flows is an important aspect of engineering design in specific applications like combustors and multi-nozzle rocket propulsion systems. In this video you'll see schlieren visualization (where density gradients are highlighted) from experiments with linear arrays of circular sonic jets, with varying numbers of jets between the arrays. "Sonic" implies that the jet flows have a Mach number =1 (flow speed matches local sound speed) at the exit plane. These visualizations reveals rich flow features with disparate nature of flow interactions between adjacent jets, which is dependent on the number of jets, inter-jet spacing, and flow pressure. In practice, depending on the application, engineers might decide to attenuate or accentuate certain aspects of flow interactions to suit overall design requirements.

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