{"id":17092,"date":"2024-06-05T09:24:43","date_gmt":"2024-06-05T09:24:43","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=17092"},"modified":"2025-09-15T12:45:14","modified_gmt":"2025-09-15T12:45:14","slug":"mechanisms-for-combustion-instability-by-micro-rocket-torch-in-scramjet-combustor-based-on-dynamic-mode-decomposition","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2024\/06\/05\/mechanisms-for-combustion-instability-by-micro-rocket-torch-in-scramjet-combustor-based-on-dynamic-mode-decomposition\/","title":{"rendered":"Mechanisms for Combustion Instability by Micro-Rocket Torch in Scramjet Combustor based on Dynamic Mode Decomposition"},"content":{"rendered":"\n<p><strong>Shinichiro OGAWA<\/strong><\/p>\n\n\n\n<p><strong>DOI Number: N\/A<\/strong><\/p>\n\n\n\n<p><strong>Conference number: HiSST-2024-218<\/strong><\/p>\n\n\n\n<p>To achieve ignition and stable combustion within a short residence time of milliseconds, the effective<br>stabilization of flames in scramjet combustors is crucial. Stable forced ignition and flame holding have<br>been explored in previous studies using various igniters, including micro-rocket torches and plasma jet<br>torches. In this study, the forced ignition and combustion instability of a scramjet combustor equipped<br>with a micro-rocket torch are investigated. Despite successful ignition promoted by the micro-rocket<br>torch in previous experiments, combustion instabilities were observed in the cavity flame holder, as<br>revealed by OH* chemiluminescence images. To elucidate the mechanisms of forced ignition and<br>combustion instability, modal analysis techniques, specifically dynamic mode decomposition (DMD), are<br>employed. DMD is a powerful method for extracting spatiotemporally coherent structures from high-<br>dimensional data, making it suitable for analysing combustion dynamics. DMD was applied to OH*<br>chemiluminescence images obtained from previous supersonic combustion experiments. The dominant<br>modes associated with combustion instability are identified, and their spectral characteristics are<br>investigated via power spectrum density (PSD) analysis. From the results, it is clarify the combustion<br>instability near the cavity flame holder, (a) in the case of low frequencies between 100 to 400 Hz were<br>formed by fuel injector flame feedback in this combustion result, (b) in the case of low frequencies<br>under 100 Hz (e.g., 15 to 50 Hz) were formed by torch gas injector flame feedback in this combustion<br>result, and (c) in the case of high frequencies over 1000 Hz were formed by interference between the<br>cavity flame holder and the flow field. Insights into the complex flow dynamics within the cavity flame<br>holder and the shear layer are provided, shedding light on the mechanisms underlying combustion<br>instability in scramjet engines equipped with micro-rocket torches.<\/p>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2024\/06\/HiSST-2024-218.pdf\">Read the full paper here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Shinichiro OGAWA<\/b><\/p>\n<p>DOI Number: N\/A<\/p>\n<p>Conference number: HiSST-2024-218<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[993,1407,1414],"tags":[1740,1741,1742,1096],"class_list":["post-17092","post","type-post","status-publish","format-standard","hentry","category-events","category-11-hisst-2024","category-propulsion-systems-and-components-11-hisst-2024","tag-combustion-instability","tag-dynamic-mode-decomposition","tag-micro-rocket-torch","tag-scramjet-combustor","category-993","category-1407","category-1414","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/17092","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=17092"}],"version-history":[{"count":2,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/17092\/revisions"}],"predecessor-version":[{"id":20784,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/17092\/revisions\/20784"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=17092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=17092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=17092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}