Throttling process of a supersonic cascade studied by high-frequency response pressure and high-speed schlieren

Abstract In this study, a single-channel supersonic cascade model is investigated experimentally at a freestream Mach number of 2.4 to obtain a better understanding of the flow field evolution during the throttling process. A flap is placed at the channel exit to choke the flow linearly. Measurement...

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Autores principales:	Ziao Wang, Juntao Chang, Wenxin Hou, Daren Yu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1d4d715a5f114b848b293cd160772484
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spelling	oai:doaj.org-article:1d4d715a5f114b848b293cd1607724842021-12-02T14:33:58ZThrottling process of a supersonic cascade studied by high-frequency response pressure and high-speed schlieren10.1038/s41598-021-93021-12045-2322https://doaj.org/article/1d4d715a5f114b848b293cd1607724842021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93021-1https://doaj.org/toc/2045-2322Abstract In this study, a single-channel supersonic cascade model is investigated experimentally at a freestream Mach number of 2.4 to obtain a better understanding of the flow field evolution during the throttling process. A flap is placed at the channel exit to choke the flow linearly. Measurements include 1-kHz schlieren imaging and 10-kHz simultaneous fast-response wall pressure. Three stages, namely attached flow, separated flow, and oscillatory flow, are identified in the throttling process. The joint time–frequency analysis and wall pressure spectrum contour exhibit the time evolution and spatial distribution of the pressure fluctuation. With the increase in backpressure, the pressure fluctuation in the low-frequency shock oscillation range of 40–400 Hz on the suction surface located in the separated flow gradually enhances. The power spectral, coherence, and phase analyses of the schlieren images describe the dominant oscillation structure and its relationship with other regions. During the separated flow, the pressure change in the subsonic separated region first lead to a change in the state of the separated shear layer, after which the shock waves in the shock train, move. The oscillatory flow is a process wherein the upstream shock wave oscillates, causing the entire downstream channel to fluctuate.Ziao WangJuntao ChangWenxin HouDaren YuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-20 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ziao Wang Juntao Chang Wenxin Hou Daren Yu Throttling process of a supersonic cascade studied by high-frequency response pressure and high-speed schlieren
description	Abstract In this study, a single-channel supersonic cascade model is investigated experimentally at a freestream Mach number of 2.4 to obtain a better understanding of the flow field evolution during the throttling process. A flap is placed at the channel exit to choke the flow linearly. Measurements include 1-kHz schlieren imaging and 10-kHz simultaneous fast-response wall pressure. Three stages, namely attached flow, separated flow, and oscillatory flow, are identified in the throttling process. The joint time–frequency analysis and wall pressure spectrum contour exhibit the time evolution and spatial distribution of the pressure fluctuation. With the increase in backpressure, the pressure fluctuation in the low-frequency shock oscillation range of 40–400 Hz on the suction surface located in the separated flow gradually enhances. The power spectral, coherence, and phase analyses of the schlieren images describe the dominant oscillation structure and its relationship with other regions. During the separated flow, the pressure change in the subsonic separated region first lead to a change in the state of the separated shear layer, after which the shock waves in the shock train, move. The oscillatory flow is a process wherein the upstream shock wave oscillates, causing the entire downstream channel to fluctuate.
format	article
author	Ziao Wang Juntao Chang Wenxin Hou Daren Yu
author_facet	Ziao Wang Juntao Chang Wenxin Hou Daren Yu
author_sort	Ziao Wang
title	Throttling process of a supersonic cascade studied by high-frequency response pressure and high-speed schlieren
title_short	Throttling process of a supersonic cascade studied by high-frequency response pressure and high-speed schlieren
title_full	Throttling process of a supersonic cascade studied by high-frequency response pressure and high-speed schlieren
title_fullStr	Throttling process of a supersonic cascade studied by high-frequency response pressure and high-speed schlieren
title_full_unstemmed	Throttling process of a supersonic cascade studied by high-frequency response pressure and high-speed schlieren
title_sort	throttling process of a supersonic cascade studied by high-frequency response pressure and high-speed schlieren
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/1d4d715a5f114b848b293cd160772484
work_keys_str_mv	AT ziaowang throttlingprocessofasupersoniccascadestudiedbyhighfrequencyresponsepressureandhighspeedschlieren AT juntaochang throttlingprocessofasupersoniccascadestudiedbyhighfrequencyresponsepressureandhighspeedschlieren AT wenxinhou throttlingprocessofasupersoniccascadestudiedbyhighfrequencyresponsepressureandhighspeedschlieren AT darenyu throttlingprocessofasupersoniccascadestudiedbyhighfrequencyresponsepressureandhighspeedschlieren
_version_	1718391116280102912

Throttling process of a supersonic cascade studied by high-frequency response pressure and high-speed schlieren

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