Transpiration cooling of hypersonic flow past a flat plate with porous injection
Transpiration cooling of hypersonic flow past a flat plate with porous injection
The strategy of transpiration-based cooling is explored where the coolant is injected into the hypersonic cross-flow using a porous layer, providing a gradual and more uniform distribution of the coolant into the boundary layer and hence higher effectiveness. In the present numerical study, three-dimensional direct numerical simulations of flow past a flat plate with a porous layer are conducted at M = 5. A conjugate heat flux boundary condition is used as compared to a simpler isothermal wall. The coolant is injected through a porous layer that is numerically represented as a staggered arrangement of spheres, which requires the utilization of smaller pressure ratios similar to that in the corresponding actual experiments. Also, to mimic the background disturbances intrinsic to the experiments, wall-bounded disturbances are introduced upstream of the porous layer such that reasonable mixing of coolant is allowed inside the hypersonic boundary layer. Flow transition is noted to play a critical role in the performance. It is noted from the first set of moderately high injection Reynolds number cases that the lowest blowing ratio results in more cooling immediately downstream of the porous layer, while the highest blowing ratio shows overall best results, with highest cooling effectiveness even farther downstream among all the blowing cases. For the second set of slightly higher injection Reynolds number cases, the trend is much more monotonous, with increasing blowing ratios providing increasingly better effectiveness.
High-speed compressible flows, transpiration cooling, porous layer, transitional flows
Sharma, Pushpender
31c7280b-e564-46cb-ad1a-bb7fa00f3887
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Sandham, Neil
0024d8cd-c788-4811-a470-57934fbdcf97
15 September 2022
Sharma, Pushpender
31c7280b-e564-46cb-ad1a-bb7fa00f3887
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Sandham, Neil
0024d8cd-c788-4811-a470-57934fbdcf97
Sharma, Pushpender, Deiterding, Ralf and Sandham, Neil
(2022)
Transpiration cooling of hypersonic flow past a flat plate with porous injection.
HiSST: 2nd International Conference on High-Speed Vehicle Science & Technology, , Bruges, Belgium.
12 - 15 Sep 2022.
12 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
The strategy of transpiration-based cooling is explored where the coolant is injected into the hypersonic cross-flow using a porous layer, providing a gradual and more uniform distribution of the coolant into the boundary layer and hence higher effectiveness. In the present numerical study, three-dimensional direct numerical simulations of flow past a flat plate with a porous layer are conducted at M = 5. A conjugate heat flux boundary condition is used as compared to a simpler isothermal wall. The coolant is injected through a porous layer that is numerically represented as a staggered arrangement of spheres, which requires the utilization of smaller pressure ratios similar to that in the corresponding actual experiments. Also, to mimic the background disturbances intrinsic to the experiments, wall-bounded disturbances are introduced upstream of the porous layer such that reasonable mixing of coolant is allowed inside the hypersonic boundary layer. Flow transition is noted to play a critical role in the performance. It is noted from the first set of moderately high injection Reynolds number cases that the lowest blowing ratio results in more cooling immediately downstream of the porous layer, while the highest blowing ratio shows overall best results, with highest cooling effectiveness even farther downstream among all the blowing cases. For the second set of slightly higher injection Reynolds number cases, the trend is much more monotonous, with increasing blowing ratios providing increasingly better effectiveness.
Text
HiSST_2022_full_paper-final
- Accepted Manuscript
More information
Accepted/In Press date: 12 September 2022
Published date: 15 September 2022
Venue - Dates:
HiSST: 2nd International Conference on High-Speed Vehicle Science & Technology, , Bruges, Belgium, 2022-09-12 - 2022-09-15
Keywords:
High-speed compressible flows, transpiration cooling, porous layer, transitional flows
Identifiers
Local EPrints ID: 470359
URI: http://eprints.soton.ac.uk/id/eprint/470359
PURE UUID: b10bebdb-b169-4e0e-92b4-3b526fdfc230
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Date deposited: 06 Oct 2022 17:19
Last modified: 17 Mar 2024 04:04
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Contributors
Author:
Neil Sandham
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