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Detonation attenuation and re-initiation in expanding channels

Detonation attenuation and re-initiation in expanding channels
Detonation attenuation and re-initiation in expanding channels
Two-dimensional adaptive simulations are carried out solving the reactive Euler
equations with a detailed reaction model based on the open-source program AMROC to investigate detonation evolution using a hot jet initiation in expanding channel filled with supersonic combustible mixtures. The results show that the supersonic mixture experiences a Prandtl-Meyer expansion with according flow acceleration in the expanding channel, which eventually leads to the nonuniformity of the incoming flow. The nonuniformity characteristic of the mixture results in the generation of a curved detonation directly behind the expansion region. Due to the low numerical diffusion for high grid-resolution, the unburned jet directly behind the expansion fan is consumed slowly, hence resulting in some chemical heat loss when it is released after the sonic plane behind the detonation front. This can further weaken the detonation front, which might be one of the reasons that result in the rapid attenuation of the detonation front. Because of highly oscillating near the upper wall resulting from the expansion fan, the shear layer along with the unburned jet becomes very unstable, hence leading to unsuccessful construction of hydrodynamic throat. As a result, the detonation cannot sustain but continuously attenuate, and finally fails, which is expected to realize re-initiation utilizing the hot jet injection once again before the shock front is totally blew out of the channel.
American Institute of Aeronautics and Astronautics
Cai, Xaidong
8d778bd0-f391-488d-b998-4f851382d9f8
Liang, Jianhan
fd8229b7-c7f4-4a1b-b94f-abce393f9e9a
Lin, Zhiyong
ca704069-5f56-4689-8fde-4edb13622723
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Cai, Xaidong
8d778bd0-f391-488d-b998-4f851382d9f8
Liang, Jianhan
fd8229b7-c7f4-4a1b-b94f-abce393f9e9a
Lin, Zhiyong
ca704069-5f56-4689-8fde-4edb13622723
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314

Cai, Xaidong, Liang, Jianhan, Lin, Zhiyong and Deiterding, Ralf (2017) Detonation attenuation and re-initiation in expanding channels. In 21st AIAA International Space Planes and Hypersonics Technologies Conference: 21st AIAA International Space Planes and Hypersonics Technologies Conference. American Institute of Aeronautics and Astronautics.. (doi:10.2514/6.2017-2274).

Record type: Conference or Workshop Item (Paper)

Abstract

Two-dimensional adaptive simulations are carried out solving the reactive Euler
equations with a detailed reaction model based on the open-source program AMROC to investigate detonation evolution using a hot jet initiation in expanding channel filled with supersonic combustible mixtures. The results show that the supersonic mixture experiences a Prandtl-Meyer expansion with according flow acceleration in the expanding channel, which eventually leads to the nonuniformity of the incoming flow. The nonuniformity characteristic of the mixture results in the generation of a curved detonation directly behind the expansion region. Due to the low numerical diffusion for high grid-resolution, the unburned jet directly behind the expansion fan is consumed slowly, hence resulting in some chemical heat loss when it is released after the sonic plane behind the detonation front. This can further weaken the detonation front, which might be one of the reasons that result in the rapid attenuation of the detonation front. Because of highly oscillating near the upper wall resulting from the expansion fan, the shear layer along with the unburned jet becomes very unstable, hence leading to unsuccessful construction of hydrodynamic throat. As a result, the detonation cannot sustain but continuously attenuate, and finally fails, which is expected to realize re-initiation utilizing the hot jet injection once again before the shock front is totally blew out of the channel.

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More information

e-pub ahead of print date: 2 March 2017
Published date: 9 March 2017
Venue - Dates: International Space Planes and Hypersonic Systems and Technologies Conferences: 21st AIAA International Space Planes and Hypersonics Technologies Conference, Xiamen, China, 2017-03-06 - 2017-03-09

Identifiers

Local EPrints ID: 415341
URI: https://eprints.soton.ac.uk/id/eprint/415341
PURE UUID: 9aa38a6b-d0ba-4524-b610-67b3153b234c
ORCID for Ralf Deiterding: ORCID iD orcid.org/0000-0003-4776-8183

Catalogue record

Date deposited: 07 Nov 2017 17:30
Last modified: 19 Jul 2019 17:53

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