{"id":22985,"date":"2025-10-25T12:55:23","date_gmt":"2025-10-25T12:55:23","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=22985"},"modified":"2025-10-25T12:55:24","modified_gmt":"2025-10-25T12:55:24","slug":"observation-of-boundary-layer-transition-on-a-sharp-cone-with-a-porous-surface","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2025\/10\/25\/observation-of-boundary-layer-transition-on-a-sharp-cone-with-a-porous-surface\/","title":{"rendered":"Observation of Boundary Layer Transition on a Sharp Cone with a Porous Surface"},"content":{"rendered":"\n<p><strong>Jungmu HUR, Jinhwi KIM, Junhyuk NAM, Jinyoung KIM, Bok Jik LEE<\/strong><\/p>\n\n\n\n<p><strong>DOI Number: N\/A<\/strong><\/p>\n\n\n\n<p><strong>Conference number: HiSST-2025-127<\/strong><\/p>\n\n\n\n<p>Laminar\u2013turbulent transition in hypersonic boundary layers causes a large increase in surface heat flux and imposes severe aerothermal loads on vehicles. Passive attenuation of boundary-layer disturbances relevant to laminar\u2013turbulent transition using porous surfaces was investigated on a half-smooth, half-porous sharp cone tested in the Seoul National University Hypersonic Shock Tunnel at Mach 6.76. Two configurations were evaluated, a uniform porous surface tuned to the Mack second-mode band measured on the smooth side, and a non-uniform porous surface that mixed two hole diameters to absorb lower frequencies not attenuated by the uniform surface. Surface-pressure and heat-flux measurements were combined with schlieren visualization to document instability growth and breakdown. On the smooth side, Mack second-mode waves amplified and broke down to turbulence. Both porous surfaces reduced the Mack second-mode peak in the pressure spectra, and the non-uniform porous surface provided greater attenuation. Consistently, the time-averaged surface heat flux on the porous side was reduced by approximately 40% relative to the smooth side. The results indicate that appropriately designed porous surfaces can attenuate Mack second-mode disturbances and reduce associated heating on sharp cones.<\/p>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2025\/10\/HISST2025_127_paper.pdf\">Read the full paper here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Jungmu HUR, Jinhwi KIM, Junhyuk NAM, Jinyoung KIM, Bok Jik LEE<\/b><\/p>\n<p>DOI Number: N\/A<\/p>\n<p>Conference number: HiSST-2025-127<\/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":[1235,440,3652],"class_list":["post-22985","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-boundary-layer-transition","tag-hypersonic","tag-mack-second-mode-instability","category-993","category-3367","category-3361","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/22985","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=22985"}],"version-history":[{"count":1,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/22985\/revisions"}],"predecessor-version":[{"id":22987,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/22985\/revisions\/22987"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=22985"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=22985"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=22985"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}