Thermal performance of tapered Hartmann–Sprenger tubes with cylindrical ends.
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| Title: | Thermal performance of tapered Hartmann–Sprenger tubes with cylindrical ends. |
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| Authors: | Verma, S. B.1 (AUTHOR) shashibverma@hotmail.com, Bauer, C.2 (AUTHOR) christian.bauer@deltaorbit.com |
| Source: | Shock Waves. Aug2026, Vol. 36 Issue 2, p1-16. 16p. |
| Abstract: | Experiments were conducted to improve the thermal performance of a tapered Hartmann–Sprenger tube of length-to-diameter ratio 11 by replacing its tapered end section with a cylindrical section. Three modified tapered cavities with cylindrical end sections, having length-to-diameter ratios of 4.1, 6, and 6.85, are studied along with the reference cavity for jet–cavity spacings of 2.19 and 2.58, and nozzle pressure ratios ranging from 8 to 20. Cavities are made of zirconium dioxide ( ZrO 2 ), which allows the local heat release location to be observed distinctly as a glowing spot. Results indicate that varying the end configuration of the tapered cavity primarily increases the amplitude of pressure pulsations, which helps to enhance their thermal performance. The best configuration is the one in which a cylindrical section is added immediately downstream of the heat release location of the original reference tapered cavity. A threefold increase in (i) the maximum end wall temperature and (ii) the rate of heat generation is achieved relative to the reference cavity. The latter is critical in designing a resonator ignitor with the enhanced response time. The jet–cavity resonance phenomenon is studied using a K-type thermocouple and a 1/4" (6.35-mm) microphone placed at 50 diameters from the jet nozzle exit plane. [ABSTRACT FROM AUTHOR] |
| Copyright of Shock Waves is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 194790930 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Thermal performance of tapered Hartmann–Sprenger tubes with cylindrical ends. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Verma%2C+S%2E+B%2E%22">Verma, S. B.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> shashibverma@hotmail.com</i><br /><searchLink fieldCode="AR" term="%22Bauer%2C+C%2E%22">Bauer, C.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> christian.bauer@deltaorbit.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Shock+Waves%22">Shock Waves</searchLink>. Aug2026, Vol. 36 Issue 2, p1-16. 16p. – Name: Abstract Label: Abstract Group: Ab Data: Experiments were conducted to improve the thermal performance of a tapered Hartmann–Sprenger tube of length-to-diameter ratio 11 by replacing its tapered end section with a cylindrical section. Three modified tapered cavities with cylindrical end sections, having length-to-diameter ratios of 4.1, 6, and 6.85, are studied along with the reference cavity for jet–cavity spacings of 2.19 and 2.58, and nozzle pressure ratios ranging from 8 to 20. Cavities are made of zirconium dioxide ( ZrO 2 ), which allows the local heat release location to be observed distinctly as a glowing spot. Results indicate that varying the end configuration of the tapered cavity primarily increases the amplitude of pressure pulsations, which helps to enhance their thermal performance. The best configuration is the one in which a cylindrical section is added immediately downstream of the heat release location of the original reference tapered cavity. A threefold increase in (i) the maximum end wall temperature and (ii) the rate of heat generation is achieved relative to the reference cavity. The latter is critical in designing a resonator ignitor with the enhanced response time. The jet–cavity resonance phenomenon is studied using a K-type thermocouple and a 1/4" (6.35-mm) microphone placed at 50 diameters from the jet nozzle exit plane. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Shock Waves is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00193-026-01269-1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 1 Titles: – TitleFull: Thermal performance of tapered Hartmann–Sprenger tubes with cylindrical ends. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Verma, S. B. – PersonEntity: Name: NameFull: Bauer, C. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 09381287 Numbering: – Type: volume Value: 36 – Type: issue Value: 2 Titles: – TitleFull: Shock Waves Type: main |
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