{"id":16159,"date":"2024-04-12T10:32:36","date_gmt":"2024-04-12T10:32:36","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=16159"},"modified":"2024-04-12T10:32:36","modified_gmt":"2024-04-12T10:32:36","slug":"quasi-steady-numerical-approach-to-investigated-intake-starting-and-unstart","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2024\/04\/12\/quasi-steady-numerical-approach-to-investigated-intake-starting-and-unstart\/","title":{"rendered":"Quasi-Steady Numerical Approach to Investigated Intake Starting and Unstart"},"content":{"rendered":"\n<p><strong>Andreas K. Flock, Adrian T.E. Krieger, Ali G\u00fclhan<\/strong><\/p>\n\n\n\n<p><strong>DOI Number XXX-YYY-ZZZ<\/strong><\/p>\n\n\n\n<p><strong>Conference Number HiSST-2022-150<\/strong><\/p>\n\n\n\n<p>In all sorts of Ramjet engines the intake serves as the major component to compress the flow to sufficiently large pressures. With its location being far upstream, its performance is crucial for all following<br>components such as combustor or nozzle. One major physical effect that influences intake performance<br>is intake starting and unstart. During intake unstart, the shock system within the diffuser quickly moves<br>upstream and mass flow and thus thrust are reduced. Therefore, a proper understanding of the unstart and then re-start behavior is essential for a correct operation of the engine. This manuscript<br>presents a numerical, quasi-steady approach to duplicate the starting and unstart characteristics with<br>a CFD approach. An axisymmetric intake configuration was used as reference configuration. In small<br>steps the free stream Mach number is decreased and then again increased while intake performance is<br>monitored. Furthermore, the starting and unstart characteristics were extracted from wind tunnel experiments. When comparing an initially unstarted, but then accelerated intake to an initially started, but<br>decelerated intake, a hysteresis effect was present: The intake unstart occurred at lower free stream<br>Mach numbers than the restart. This hysteresis effect was also detected during the wind tunnel experiments. Overall, the re-start and unstart Mach numbers, detected with the numerical approach were<br>within 7 % of the values detected during experiment.<\/p>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2023\/10\/HiSST-2022-150.pdf\" data-type=\"link\" data-id=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2023\/10\/HiSST-2022-150.pdf\">Read the full paper > <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Andreas K. Flock, Adrian T.E. Krieger, Ali G\u00fclhan<\/b><\/p>\n<p>DOI Number XXX-YYY-ZZZ<\/p>\n<p>Conference Number HiSST-2022-150<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[993,1006,1013],"tags":[498,451,452],"class_list":["post-16159","post","type-post","status-publish","format-standard","hentry","category-events","category-hisst-2022","category-propulsion-systems-and-components-hisst-2022","tag-diffuser","tag-ramjet","tag-supersonic","category-993","category-1006","category-1013","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16159","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=16159"}],"version-history":[{"count":1,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16159\/revisions"}],"predecessor-version":[{"id":16160,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16159\/revisions\/16160"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=16159"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=16159"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=16159"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}