Effects of fluctuations in concentration on detonation propagation
Effects of fluctuations in concentration on detonation propagation
The authors examine the effects of inhomogeneity in the equivalence ratio on detonation propagation by using a set of two-dimensional numerical simulations of the detailed reaction chemistry of an H2/air mixture. A random field of fluctuations but with statistical characteristics is introduced, and several combinations of the root mean square (RMS) and characteristic length scales of the fluctuations are considered to investigate the evolutions of the cellular structure, speed of detonation, and shock pressure under these setups. The results indicate that an increase in the RMS enlarged the cell formed by the original triple points as well as the characteristic length scale to promote the transition from a single cellular pattern to a double cellular pattern. The large cell of the double cellular pattern was formed by triple points generated from local explosion, and the decoupling or curvature of the detonation wave within an extremely lean region was important for this process. Moreover, sustainable detonation propagation under these configurations benefited from the strong transverse detonation generated by the local explosion as well as the propagation of these original triple points along the stoichiometric region, where their collisions reinitiated detonation in the extremely lean region. The instantaneous and average speeds of detonation were calculated. The former followed the trend of evolution of the normalized potential instantaneous energy release, whereas the latter decreased with an increase in ø′. However, the value of lø had a non-monotonic influence that can be attributed to two factors.
Zhou, Yong
21738f5a-ba95-4b80-8666-b1d411d30bca
Zhang, Xiaojun
aed8849c-3c3a-40ae-b579-f984fa369e8b
Zhong, Lijia
20504f5e-9424-4077-952c-2a38ede34858
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Zhou, Lei
29311185-e1e4-417f-9fb9-ddc1d3f16d09
Wei, Haiqiao
357376b6-ab52-4a4c-a4e3-f4d6be35abbd
6 July 2022
Zhou, Yong
21738f5a-ba95-4b80-8666-b1d411d30bca
Zhang, Xiaojun
aed8849c-3c3a-40ae-b579-f984fa369e8b
Zhong, Lijia
20504f5e-9424-4077-952c-2a38ede34858
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Zhou, Lei
29311185-e1e4-417f-9fb9-ddc1d3f16d09
Wei, Haiqiao
357376b6-ab52-4a4c-a4e3-f4d6be35abbd
Zhou, Yong, Zhang, Xiaojun, Zhong, Lijia, Deiterding, Ralf, Zhou, Lei and Wei, Haiqiao
(2022)
Effects of fluctuations in concentration on detonation propagation.
Physics of Fluids, 34 (7), [076101].
(doi:10.1063/5.0096965).
Abstract
The authors examine the effects of inhomogeneity in the equivalence ratio on detonation propagation by using a set of two-dimensional numerical simulations of the detailed reaction chemistry of an H2/air mixture. A random field of fluctuations but with statistical characteristics is introduced, and several combinations of the root mean square (RMS) and characteristic length scales of the fluctuations are considered to investigate the evolutions of the cellular structure, speed of detonation, and shock pressure under these setups. The results indicate that an increase in the RMS enlarged the cell formed by the original triple points as well as the characteristic length scale to promote the transition from a single cellular pattern to a double cellular pattern. The large cell of the double cellular pattern was formed by triple points generated from local explosion, and the decoupling or curvature of the detonation wave within an extremely lean region was important for this process. Moreover, sustainable detonation propagation under these configurations benefited from the strong transverse detonation generated by the local explosion as well as the propagation of these original triple points along the stoichiometric region, where their collisions reinitiated detonation in the extremely lean region. The instantaneous and average speeds of detonation were calculated. The former followed the trend of evolution of the normalized potential instantaneous energy release, whereas the latter decreased with an increase in ø′. However, the value of lø had a non-monotonic influence that can be attributed to two factors.
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Accepted/In Press date: 13 June 2022
e-pub ahead of print date: 6 July 2022
Published date: 6 July 2022
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Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 51921004).
Publisher Copyright:
© 2022 Author(s).
Identifiers
Local EPrints ID: 467621
URI: http://eprints.soton.ac.uk/id/eprint/467621
ISSN: 1070-6631
PURE UUID: 1fa9f023-a043-4484-baf0-fa61a038f3db
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Date deposited: 15 Jul 2022 19:11
Last modified: 17 Mar 2024 03:39
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Author:
Yong Zhou
Author:
Xiaojun Zhang
Author:
Lijia Zhong
Author:
Lei Zhou
Author:
Haiqiao Wei
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