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Published March 2014 | public
Journal Article

Investigation of Cavity Flow Using Fast-Response Pressure-Sensitive Paint


An experimental study was conducted to investigate the pressure fluctuations on the entire sidewall of a rectangular cavity with an L/D of 5.67 using fast-response pressure-sensitive paint. Additionally, the performance of four different passive flow-control devices was quantified. Experiments were conducted in the Trisonic Gasdynamics Facility at the Air Force Research Laboratory at Mach 0.7 and 1.5. The frequency spectrum (including Rossiter tones) and sound pressure levels obtained from the pressure-sensitive paint measurements are validated against data taken with conventional dynamic pressure sensors. The complex flow phenomena over the cavity wall were visualized, and full-wall pressure spectra were calculated. The rod in crossflow showed the best peak suppression, followed closely by the flat spoiler. The large triangular steps showed moderate peak suppression, whereas the ridges did not suppress the peaks at all. High-resolution measurements of both temporal and spatial pressure fluctuations on the wall allowed for the visualization of sound pressure level distribution over the entire cavity wall. This revealed a strong dependence between the Rossiter tone modes and the spatial distribution of sound pressure levels that was not possible to resolve with traditional discrete pressure transducers.

Additional Information

© 2013 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Presented as Paper 2013-0678 at the 51st AIAA Aerospace Sciences Meeting, Grapevine, TX, 7–10 January 2013; received 24 June 2013; revision received 26 September 2013; accepted for publication 2 October 2013; published online 21 March 2014. The authors would like to thank the Air Force Research Laboratories (AFRL) for supporting this research as part of a Phase II Small Business Innovation Research program with Ryan Schmit and Heidi Wilken as technical monitors. Additionally, we would like to thank the facility personnel at the Trisonic Gasdynamics Facility. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of AFRL. Approved for public release; distribution is unlimited (case 88ABW-2012-6449).

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