77th Annual Meeting of the APS Division of Fluid Dynamics (November 24, 2024 — November 26, 2024)

P2686180: Blast-induced fluid fishbones

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Authors

• Saini Jatin Rao, Indian Institute of Science, Bengaluru, India
• Akhil Aravind, Indian Institute of Science, Bengaluru, India
• Saptarshi Basu, Indian Institute of Science, Bengaluru, India

DOI: https://doi.org/10.1103/APS.DFD.2024.GFM.P2686180

Liquid interfaces interacting with high-speed gas flows result in unsteady waves, atomization and countless applications. Here, we capture the intricate dynamics of a blast-induced air flow interacting with a liquid jet at the opening of a shock tube with a rectangular cross-section (aspect ratio 2:1). Features like a blast wave and the induced airflow rolling up to form a compressible vortex ring are observed using schlieren imaging. This decaying flow field, when imposed over the water jet interface, leads to a cascade of ripples with waves getting coarser in time. Furthermore, asymmetric airflow leads to a fishbone-like jet morphology with minimal dynamics when viewed from the shorter edge (side view).Experiment details: Blast source: High voltage copper wire explosion at the tube base; Shock Mach number at the tube opening: 1.7Front View: Various time steps depicting the blast wave, induced compressible vortex ring, shear layers at the tube exit and sequence of waves on the liquid interface, with time being measured from the explosion.Side View: Deformed jet at multiple timesteps overlaid corresponding to the front view.