{"id":23263,"date":"2025-10-26T12:08:52","date_gmt":"2025-10-26T12:08:52","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=23263"},"modified":"2025-10-26T12:08:53","modified_gmt":"2025-10-26T12:08:53","slug":"flowfield-investigation-through-khz-measurements-of-an-underexpanded-jet-in-hypersonic-crossflow","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2025\/10\/26\/flowfield-investigation-through-khz-measurements-of-an-underexpanded-jet-in-hypersonic-crossflow\/","title":{"rendered":"Flowfield Investigation through kHz Measurements of an Underexpanded Jet in Hypersonic Crossflow"},"content":{"rendered":"\n<p><strong>Nicholas STEGMEIER, Neil RODRIGUES, Kevin POSLADEK, Christopher COMBS<\/strong><\/p>\n\n\n\n<p><strong>DOI Number: N\/A<\/strong><\/p>\n\n\n\n<p><strong>Conference number: HiSST-2025-021<\/strong><\/p>\n\n\n\n<p>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 (Re\u2081 \u2248 3\u00d710\u2077 m\u207b\u00b9) 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 St\u03b4 \u2248 0.017.<\/p>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2025\/10\/HISST2025_21_paper.pdf\">Read the full paper here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Nicholas STEGMEIER, Neil RODRIGUES, Kevin POSLADEK, Christopher COMBS<\/b><\/p>\n<p>DOI Number: N\/A<\/p>\n<p>Conference number: HiSST-2025-021<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[993,3367,3361],"tags":[3746,1180,1654,3745],"class_list":["post-23263","post","type-post","status-publish","format-standard","hentry","category-events","category-high-speed-aerodynamics-and-aerothermodynamics-with-application-to-hypersonic-regimes","category-1-hisst-2025","tag-high-speed-measurements","tag-hypersonic-flows","tag-jet-in-crossflow","tag-non-intrusive-diagnostics","category-993","category-3367","category-3361","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/23263","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/comments?post=23263"}],"version-history":[{"count":1,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/23263\/revisions"}],"predecessor-version":[{"id":23265,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/23263\/revisions\/23265"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=23263"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=23263"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=23263"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}