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Time-resolved imaging of the cellular structure of methane and natural gas detonations

Frederick, M. D. and Gejji, R. M. and Shepherd, J. E. and Slabaugh, C. D. (2022) Time-resolved imaging of the cellular structure of methane and natural gas detonations. Shock Waves, 32 (4). pp. 337-351. ISSN 0938-1287. doi:10.1007/s00193-022-01080-8.

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We present experimental observations of the density field and reaction structure of methane and natural gas detonation waves propagating in a narrow channel. Simultaneous time-resolved schlieren and CH∗ chemiluminescence images are used to describe the structure of the unstable front. Nitrogen dilution concentration is varied, and the effect of increasing dilution is to increase the instability level and cell size and decrease the chemiluminescence intensity. Comparison is made between methane- and natural gas-fueled detonations. The effect of the higher hydrocarbons present in natural gas, primarily ethane, is to increase the fine-scale structure of the detonation front and create a more continuous reaction front. Utilizing the simultaneous images, observations are made about the formation and dissipation of the material separated across the shear layer behind the front.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Frederick, M. D.0000-0002-3746-3012
Gejji, R. M.0000-0002-8588-3679
Shepherd, J. E.0000-0003-3181-9310
Slabaugh, C. D.0000-0002-7434-6376
Additional Information:© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2022. Received: 11 August 2021; Revised: 20 February 2022; Accepted: 12 March 2022; Published online: 12 May 2022. Mark D. Frederick acknowledges support from the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1333468. The high-speed camera used in this work was purchased with DURIP grant FA9550-16-1-0534 (Program Manager: Chiping Li). Data availability: The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
Funding AgencyGrant Number
NSF Graduate Research FellowshipDGE-1333468
Air Force Office of Scientific Research (AFOSR)FA9550-16-1-0534
Subject Keywords:Hydrocarbon detonation; Schlieren; CH∗; Cellular structure; Narrow channel
Issue or Number:4
Record Number:CaltechAUTHORS:20220624-503895100
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Official Citation:Frederick, M.D., Gejji, R.M., Shepherd, J.E. et al. Time-resolved imaging of the cellular structure of methane and natural gas detonations. Shock Waves 32, 337–351 (2022).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115273
Deposited By: Tony Diaz
Deposited On:28 Jun 2022 19:48
Last Modified:28 Jun 2022 19:48

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