Improved Optical Techniques for Studying Sonic and Supersonic Injection into MACH-3 Flow https://peertube.dngr.us/videos/watch/d6e8f43e-d014-4452-95ee-bd652cc70341 This video supplements a report examining optical techniques for studying sonic and supersonic injection into MACH-3 flow The study used an injection-seeded, frequency doubled ND:YAG pulsed laser to illuminate a transverse section of the injectant plume. Rayleigh scattered light was passed through an iodine absorption cell to suppress stray laser light and was imaged onto a cooled CCD camera. The scattering was based on condensation of water vapor in the injectant flow. High speed shadowgraph flow visualization images were obtained with several video camera systems. Roof and floor static pressure data are presented several ways for the three configurations of injection designs with and without helium and/or air injection into Mach 3 flow. NOTE: No audio. See related report at http://hdl.handle.net/2060/19970035033. Mirrored from YouTube: https://youtu.be/FxzUewd_uRk Original channel: NASA STI Program Wed, 15 Jul 2026 12:44:42 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.dngr.us Improved Optical Techniques for Studying Sonic and Supersonic Injection into MACH-3 Flow https://peertube.dngr.us/lazy-static/avatars/ec5edb1e-3795-4978-be4f-c67e98fbc992.png https://peertube.dngr.us/videos/watch/d6e8f43e-d014-4452-95ee-bd652cc70341 All rights reserved, unless otherwise specified in the terms specified at https://peertube.dngr.us/about and potential licenses granted by each content's rightholder.