Correction: FLEET Velocimetry at 100 kHz in Hypersonic Flows (American Institute of Aeronautics and Astronautics Inc, AIAA)

Correction Notice Table 3’s timing parameters should read Delay 1: 220 ns, and Delay 2: 2220 ns. (Table presented) The first paragraph in Section B. Hypersonic flow velocimetry should read that the mean freestream displacement is 1.92 mm, not 1.94 mm. It should also read that the measured freestream velocity value is in good agreement with previous 1-kHz FLEET velocimetry performed in the ACE tunnel. The original version reads general agreement. This work’s value and relative error match the 1-kHz results almost exactly. The paragraph under Figure 5 in page 7, in Section B. Hypersonic flow velocimetry, should include the following addendum: During the wind tunnel run, the translational stage moved the laser focal region from the freestream to the boundary layer. A 5-mm through-hole in the test article allowed the laser beam to pass without impinging on the model, enabling flow velocity measurements as close as approximately 1 mm from the surface. Figure 6 shows the measured flow velocity as a function of distance from the model surface. The furthest-right data points correspond to the freestream velocity value, as calculated and displayed in Fig. 5.Figure 6’s error bars were originally shown on the vertical axis (y position). These error bars should be on the horizontal axis (Velocity), indicating fluctuations in the velocity. (Image presented) The following addendum should be added to the final paragraph of Section B. Hypersonic flow velocimetry in order to support the data that is presented in Figure 6: Each data point corresponds to a set of consecutive time-averaged images. The error increases as closer to the model due to shot-to-shot flow fluctuations caused by turbulence in the boundary layer. While larger error bars near the model surface may suggest an inability to capture varying flow velocities, the flow imaging section and Fig. 4 demonstrate the system’s capability to measure different flow rates with low fluctuations. Thus, the larger error bars reflect turbulence within the test article’s boundary layer rather than a system limitation. Our FLEET system demonstrates single-shot MTV capabilities in sub-10 µs timescales, allowing for time-resolved near-boundary flow studies.