| アイテムタイプ |
itemtype_ver1(1) |
| 公開日 |
2025-07-16 |
| タイトル |
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タイトル |
Geometrical impedance matching for weak shock waves at shock tube end wall |
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言語 |
en |
| 著者 |
Hagiwara, Jun
Shigeta, Naotaka
Kimura, Nao
Custodio, Daniel
Asahi, Takumi
Ozawa, Koki
Yamaguchi, Tsuki
Nakamura, Yusuke
Sasoh, Akihiro
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| アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 権利 |
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権利情報 |
Copyright 2025 Author(s). Published under an exclusive license by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.The following article appeared in (Physics of Fluids 37, 046111 (2025)) and may be found at (https://doi.org/10.1063/5.0260782). |
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言語 |
en |
| 内容記述 |
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内容記述タイプ |
Abstract |
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内容記述 |
When a shock wave encounters an interface with a medium of different acoustic impedance, a reflected wave is generated. It is a shock wave if the medium has a higher acoustic impedance or an expansion fan if the impedance is lower. When the acoustic impedances are perfectly matched, no wave is reflected—a phenomenon known as “impedance matching.” This study aims to achieve a similar effect by varying the geometry of the shock tube exit. Assuming a steady-state, quasi-one-dimensional and subsonic post flow, we derived the exit geometry condition under which neither shock waves nor expansion waves are reflected. To validate this condition, we conducted shock tube experiments with shock Mach numbers up to approximately 1.07, and found that the shock wave reflection behavior is influenced not only by the cross-sectional area ratio of the tube but also by the specific shape of the orifice. In tests with a simple converging orifice shape, a pressure spike occurred due to the leading reflected shock wave before the pressure stabilized. The overpressure of this spike was reduced to 7 × 10^-3 times the pressure ahead of the spike by installing perforated sections and a porous metal body on the sidewall just upstream of the orifice. This study offers a new approach to suppress post-shock pressure fluctuations in practical applications such as high-speed trains entering tunnels and within exhaust pipes of internal combustion engines, as well as to extend the test duration of shock tube experiments. |
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言語 |
en |
| 出版者 |
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出版者 |
AIP Publishing |
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言語 |
en |
| 言語 |
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|
言語 |
eng |
| 資源タイプ |
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資源タイプresource |
http://purl.org/coar/resource_type/c_6501 |
|
タイプ |
journal article |
| 出版タイプ |
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出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| 関連情報 |
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関連タイプ |
isVersionOf |
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|
識別子タイプ |
DOI |
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関連識別子 |
https://doi.org/10.1063/5.0260782 |
| 収録物識別子 |
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収録物識別子タイプ |
PISSN |
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収録物識別子 |
1070-6631 |
| 書誌情報 |
en : Physics of Fluids
巻 37,
号 4,
p. 046111,
発行日 2025-04-04
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| ファイル公開日 |
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日付 |
2026-04-04 |
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日付タイプ |
Available |
046111_1_5_0260782.pdf (6.4 MB)
