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Upconverting nanoengineered Surfaces: maskless photolithography for security applications

Upconverting nanoengineered Surfaces: maskless photolithography for security applications
Upconverting nanoengineered Surfaces: maskless photolithography for security applications
The deceleration of a supersonic flow to the subsonic regime inside a high-speed engine occurs through a series of shock waves, known as a shock train. The generation of such a flow structure is due to the interaction between the shock waves and the boundary layer inside a long and narrow duct. The understanding of the physics governing the shock train is vital for the improvement of the design of high-speed engines and the development of flow control strategies. The present paper analyses the sensitivity of the shock train configuration to a back-pressure variation. The complex characteristics of the shock train at an inflow Mach number M = 2 in a channel of constant height are investigated with two-dimensional RANS equations closed by the Wilcox k-ω turbulence model. Under a sinusoidal back-pressure variation, the simulated results indicate that the shock train executes a motion around its mean position that deviates from a perfect sinusoidal profile with variation in oscillation amplitude, frequency, and whether the pressure is first increased or decreased.

2574-0970
471-481
Gnani, F.
6001364a-f3ee-400e-9394-8adb273c044a
Zare-Behtash, H.
74be9b97-cb09-49c6-9f75-7ec58c0dd16c
White, C.
68ecd8fa-08f2-4809-a8da-a684ff37b14d
Kontis, K.
e40ecdbc-e5e9-4522-abf9-e3c3f3c2d7fa
Gnani, F.
6001364a-f3ee-400e-9394-8adb273c044a
Zare-Behtash, H.
74be9b97-cb09-49c6-9f75-7ec58c0dd16c
White, C.
68ecd8fa-08f2-4809-a8da-a684ff37b14d
Kontis, K.
e40ecdbc-e5e9-4522-abf9-e3c3f3c2d7fa

Gnani, F., Zare-Behtash, H., White, C. and Kontis, K. (2018) Upconverting nanoengineered Surfaces: maskless photolithography for security applications. ACS Applied Nano Materials, 145, 471-481. (doi:10.1021/acsanm.9b00549).

Record type: Article

Abstract

The deceleration of a supersonic flow to the subsonic regime inside a high-speed engine occurs through a series of shock waves, known as a shock train. The generation of such a flow structure is due to the interaction between the shock waves and the boundary layer inside a long and narrow duct. The understanding of the physics governing the shock train is vital for the improvement of the design of high-speed engines and the development of flow control strategies. The present paper analyses the sensitivity of the shock train configuration to a back-pressure variation. The complex characteristics of the shock train at an inflow Mach number M = 2 in a channel of constant height are investigated with two-dimensional RANS equations closed by the Wilcox k-ω turbulence model. Under a sinusoidal back-pressure variation, the simulated results indicate that the shock train executes a motion around its mean position that deviates from a perfect sinusoidal profile with variation in oscillation amplitude, frequency, and whether the pressure is first increased or decreased.

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More information

Accepted/In Press date: 5 February 2018
e-pub ahead of print date: 15 February 2018
Published date: 23 March 2018

Identifiers

Local EPrints ID: 491066
URI: http://eprints.soton.ac.uk/id/eprint/491066
ISSN: 2574-0970
PURE UUID: a3648f25-8aea-4fd6-aa4e-7a93412ce6d8
ORCID for H. Zare-Behtash: ORCID iD orcid.org/0000-0002-4769-4076

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Date deposited: 11 Jun 2024 23:42
Last modified: 12 Jun 2024 02:11

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Contributors

Author: F. Gnani
Author: H. Zare-Behtash ORCID iD
Author: C. White
Author: K. Kontis

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