{"id":16143,"date":"2024-04-12T10:18:21","date_gmt":"2024-04-12T10:18:21","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=16143"},"modified":"2024-04-12T10:18:21","modified_gmt":"2024-04-12T10:18:21","slug":"large-eddy-simulation-of-multiport-injector-array-induced-transition","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2024\/04\/12\/large-eddy-simulation-of-multiport-injector-array-induced-transition\/","title":{"rendered":"Large Eddy Simulation of Multiport Injector Array Induced Transition"},"content":{"rendered":"\n<p><strong>Nicholas N. Gibbons, Tristan Vanyai, Vincent Wheatley<\/strong><\/p>\n\n\n\n<p><strong>DOI Number XXX-YYY-ZZZ<\/strong><\/p>\n\n\n\n<p><strong>Conference Number HiSST-2022-115<\/strong><\/p>\n\n\n\n<p>A numerical study of compressible turbulent transition behind a multiport injector array (MPIA) is conducted. The flow domain corresponds to an axisymmetric inlet recently tested at The University of<br>Queensland that used an MPIA to trip the boundary layer, by injecting a small amount of nitrogen close<br>to the wall. A single row of four 0.2mm porthole injectors is simulated using Wall-Modelled Large Eddy<br>Simulation (LES), at an experimental condition corresponding to Mach 7.6 flight at a dynamic pressure<br>of 50kPa. The LES simulations reveal that the MPIA injection results in immediate large scale instabilities reminiscent of near-wall turbulence. The main feature of interest is a family of dominant frequencies<br>superimposed on the turbulent wavestructure, with a base wavelength of \u2248 5mm. The source of this<br>regularity appears to be periodic oscillation of the final fuel jet, which in turn is dynamically coupled to the<br>upstream jets in an complex and interesting manner which has not been described before. The turbulent<br>flow behind the MPIA results in an increase in wall heat transfer that counteracts any film cooling that<br>may be present from the injectors. The LES prediction of the heat transfer rates compare favourably to<br>experimental measurements, and RANS simulations using the Spalart-Allmaras and Menter SST models are found to underpredict wall heat transfer throughout the domain.<\/p>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2023\/10\/HiSST-2022-115.pdf\" data-type=\"link\" data-id=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2023\/10\/HiSST-2022-115.pdf\">Read the full paper > <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Nicholas N. Gibbons, Tristan Vanyai, Vincent Wheatley<\/b><\/p>\n<p>DOI Number XXX-YYY-ZZZ<\/p>\n<p>Conference Number HiSST-2022-115<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[993,1006,1010],"tags":[546,469,580],"class_list":["post-16143","post","type-post","status-publish","format-standard","hentry","category-events","category-hisst-2022","category-hypersonic-fundamentals-and-history-hisst-2022","tag-hypersonics","tag-large-eddy-simulation","tag-transition","category-993","category-1006","category-1010","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16143","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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/comments?post=16143"}],"version-history":[{"count":1,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16143\/revisions"}],"predecessor-version":[{"id":16144,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16143\/revisions\/16144"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=16143"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=16143"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=16143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}