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According to the design principle of parallel light through schlieren windows in a cylindrical duct, a high-precision conformal optical window pair was designed and integratively processed before. Based on a self-built pipeline structure with conformal windows in a direct-connect wind tunnel under adjustable back-pressure conditions, the shock surfaces in a cylindrical isolator at Mach 2 were first captured by the schlieren method. Then, the schlieren photographs were corrected by a nonlinear image transformation algorithm for the restoration of real shock train structures, and the experimental results were compared with numerical simulation results quantitatively. Finally, the shock train positions were calculated by an image recognition algorithm to analyze the self-excited oscillation frequency characteristics of shock train structures. The methods and experiments in this study enriched optical observation methods of supersonic flows through non-rectangular cross-section isolators in scramjet.<\/jats:p>\n                <jats:p><jats:bold>Graphical abstract<\/jats:bold><\/jats:p>","DOI":"10.1007\/s12650-024-01004-x","type":"journal-article","created":{"date-parts":[[2024,7,3]],"date-time":"2024-07-03T15:04:30Z","timestamp":1720019070000},"page":"1015-1035","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Schlieren measurements of  shock train flow fields in a supersonic cylindrical isolator at Mach 2"],"prefix":"10.1007","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3388-571X","authenticated-orcid":false,"given":"Yang","family":"Ou","sequence":"first","affiliation":[]},{"given":"Bing","family":"Xiong","sequence":"additional","affiliation":[]},{"given":"Yifan","family":"Dai","sequence":"additional","affiliation":[]},{"given":"Xiaoqiang","family":"Fan","sequence":"additional","affiliation":[]},{"given":"Shanyong","family":"Chen","sequence":"additional","affiliation":[]},{"given":"Shangcheng","family":"Xu","sequence":"additional","affiliation":[]},{"given":"Yuepeng","family":"Yan","sequence":"additional","affiliation":[]},{"given":"Hao","family":"Hu","sequence":"additional","affiliation":[]},{"given":"Yupeng","family":"Xiong","sequence":"additional","affiliation":[]},{"given":"Chunyang","family":"Du","sequence":"additional","affiliation":[]},{"given":"Chaoliang","family":"Guan","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2024,7,3]]},"reference":[{"key":"1004_CR1","unstructured":"Chapman DR, Kuehn DM, Larson HK (1958) Investigation of separated flows in supersonic and subsonic streams with emphasis on the effect of transition. 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