Journal article
Design principles for transpiration cooled ceramic sharp leading edges
- Abstract:
- Transpiration cooling is an active methodology in reducing surface heat flux for hypersonic vehicles, which offers the possibility of reducing nose bluntness and therefore increasing aerodynamic performance. This paper presents a numerical analysis of transpiration cooled sharp leading edges made from ultra-high-temperature ceramics (UHTCs). The structural integrity of a 10 mm radius wedge leading edge is investigated numerically with regard to different coolant plenum geometries and pressurisation magnitudes. It is found that the close spacing of individual plenum chambers reduces the stress in the material significantly and provides the maximum possible coolant mass flux. An optimisation procedure of plenum pressure distribution is carried out using an analytical description of the porous flow in the leading edge. It is found that there exists an optimum plenum pressure that minimises the probability of failure of the leading edge model. Nitrogen coolant requires less pressure than Helium to reach this criterion and furthermore requires less pressure to displace the air freestream and thus protect the leading edge from oxidation.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
-
-
(Preview, Accepted manuscript, pdf, 7.7MB, Terms of use)
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- Publisher copy:
- 10.2514/1.t7248
Authors
+ Defense Advanced Research Projects Agency
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- Funder identifier:
- https://ror.org/02caytj08
- Grant:
- HR001119S0022
- Programme:
- MACH program
+ Engineering and Physical Sciences Research Council
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- Funder identifier:
- https://ror.org/0439y7842
- Grant:
- P/P000878/1
- Publisher:
- American Institute of Aeronautics and Astronautics
- Journal:
- Journal of Thermophysics and Heat Transfer More from this journal
- Publication date:
- 2026-05-26
- Acceptance date:
- 2026-03-22
- DOI:
- EISSN:
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1533-6808
- ISSN:
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0887-8722
- Language:
-
English
- Keywords:
- Pubs id:
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2393811
- Local pid:
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pubs:2393811
- Deposit date:
-
2026-03-23
- ARK identifier:
Terms of use
- Copyright holder:
- Hermann et al.
- Copyright date:
- 2026
- Rights statement:
- © 2026 by the authors. Publishedby the American Institute of Aeronautics and Astronautics, Inc., with per-mission. All requests for copying and permission to reprint should besubmitted to CCC at www.copyright.com; employ the eISSN 1533-6808to initiate your request. See also AIAA Rights and Permissions https://aiaa.org/publications/publish-with-aiaa/rights-and-permissions/.
- Notes:
- The author accepted manuscript (AAM) of this paper has been made available under the University of Oxford's Open Access Publications Policy, and a CC BY public copyright licence has been applied.
- Licence:
- CC Attribution (CC BY)
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