{"id":16234,"date":"2024-04-12T13:02:20","date_gmt":"2024-04-12T13:02:20","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=16234"},"modified":"2024-04-12T13:02:20","modified_gmt":"2024-04-12T13:02:20","slug":"jet-noise-of-an-airframe-integrated-dual-mode-nozzle-propulsion-system-during-take-off-and-landing","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2024\/04\/12\/jet-noise-of-an-airframe-integrated-dual-mode-nozzle-propulsion-system-during-take-off-and-landing\/","title":{"rendered":"Jet noise of an airframe-integrated dual-mode nozzle propulsion system during take-off and landing."},"content":{"rendered":"\n<p><strong>Karel H. Lammers, Remco Habing, Guillaume Grossir, Christophe Schram<\/strong><\/p>\n\n\n\n<p><strong>DOI Number XXX-YYY-ZZZ<\/strong><\/p>\n\n\n\n<p><strong>Conference Number HiSST-2022-315<\/strong><\/p>\n\n\n\n<p>This paper describes the application of existing semi-empirical jet noise models to flows expected in<br>airframe-integrated propulsion systems. In this study, the LAPCAT-MR2.4 air-breathing propulsion<br>system for hypersonic aviation is examined during the subsonic landing and take-off (LTO) cycle. For<br>this part of the flight envelope the internal flow topology is that of a subsonic core flow in the main<br>nozzle, which is penetrated by two lateral jets with low-supersonic discharge velocities. The complex<br>three-dimensional mixing between the subsonic and supersonic streams takes place within a long<br>diffuser nozzle that is also integrated within the airframe. During the LTO cycle it shields the jet and<br>offers room for acoustic liners to reduce noise emissions. In this research the propulsion system of the<br>LAPCAT-MR2.4 vehicle is represented by a simplified coaxial axi-symmetric configuration, still retaining<br>the key flow features of the real geometry, which are considered to be aero-acoustically dominant. A<br>scaled-down nozzle for an unheated jet is designed, instrumented and tested in order to evaluate the<br>applicability of using existing semi-empirical jet noise models to predict the far field noise arising from<br>this type of propulsion systems. With these insights, key jet noise sources and directivities were<br>identified and attempts were made to alter existing semi-empirical jet noise models to predict the noise<br>originating from the laboratory scale nozzle.<\/p>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2023\/10\/HiSST-2022-315.pdf\" data-type=\"link\" data-id=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2023\/10\/HiSST-2022-315.pdf\">Read the full paper > <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Karel H. Lammers, Remco Habing, Guillaume Grossir, Christophe Schram<\/b><\/p>\n<p>DOI Number XXX-YYY-ZZZ<\/p>\n<p>Conference Number HiSST-2022-315<\/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":[1197,546,1200,1199,1138,1198],"class_list":["post-16234","post","type-post","status-publish","format-standard","hentry","category-events","category-hisst-2022","category-propulsion-systems-and-components-hisst-2022","tag-jet-noise","tag-hypersonics","tag-lapcat-ii","tag-lto-cycle","tag-stratofly","tag-supersonic-transport","category-993","category-1006","category-1013","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16234","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=16234"}],"version-history":[{"count":1,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16234\/revisions"}],"predecessor-version":[{"id":16235,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/16234\/revisions\/16235"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=16234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=16234"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=16234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}