Nicholas STEGMEIER, Neil RODRIGUES, Kevin POSLADEK, Christopher COMBS

DOI Number: N/A

Conference number: HiSST-2025-021

High-speed schlieren, infrared thermography, and acetone planar laser-induced fluorescence (PLIF) were applied to an underexpanded sonic jet transversely injected into a Mach 7.2 air crossflow (Re₁ ≈ 3×10⁷ m⁻¹) in the University of Texas at San Antonio (UTSA) Ludwieg tube. Wide-field schlieren at 40 kHz captured jet startup, while 300-kHz near-field schlieren resolved bow shock breathing, shear layer flapping, and barrel shock deformation. Mid-wave infrared (IR) imaging at 4 kHz, acquired simultaneously with the 40-kHz schlieren, revealed spanwise-varying surface heating peaks and valleys driven by upstream vortices. Center-plane acetone PLIF at 10 kHz, acquired during a separate test run, visualized barrel shock topology and shear layer roll-up, providing depth-resolved context to the path-integrated schlieren. Snapshot proper orthogonal decomposition of the schlieren and PLIF images isolated a dominant coupled bow/barrel shock mode with Strouhal number Stδ ≈ 0.017.

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In Categories: 1.Events, 1.HiSST 2025, High-Speed Aerodynamics and Aerothermodynamics with application to hypersonic regimes
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