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Propagation instabilities of the oblique detonation wave in partially prevaporized n-heptane sprays

Published online by Cambridge University Press:  01 April 2024

Cheng Tian Open the ORCID record for Cheng Tian [Opens in a new window] ,
Honghui Teng Open the ORCID record for Honghui Teng [Opens in a new window] ,
Baolu Shi Open the ORCID record for Baolu Shi [Opens in a new window] ,
Pengfei Yang Open the ORCID record for Pengfei Yang [Opens in a new window] ,
Kuanliang Wang Open the ORCID record for Kuanliang Wang [Opens in a new window]  and
Majie Zhao Open the ORCID record for Majie Zhao [Opens in a new window]
Cheng Tian
Affiliation:
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, PR China
Honghui Teng
Affiliation:
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, PR China Chongqing Innovation Center, Beijing Institute of Technology, Chongqing 401120, PR China Advanced Jet Propulsion Innovation Center, Aero Engine Academy of China, Beijing 101300, PR China
Baolu Shi
Affiliation:
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, PR China Chongqing Innovation Center, Beijing Institute of Technology, Chongqing 401120, PR China
Pengfei Yang
Affiliation:
SKLTCS, CAPT, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, PR China
Kuanliang Wang
Affiliation:
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, PR China
Majie Zhao*
Affiliation:
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, PR China Chongqing Innovation Center, Beijing Institute of Technology, Chongqing 401120, PR China
*
†Email address for correspondence: zhaomj@bit.edu.cn
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Abstract

Two-dimensional oblique detonation wave (ODW) propagations in partially prevaporized n-heptane sprays are numerically simulated with a skeletal chemical mechanism. The influences of the droplet diameter and total equivalence on oblique detonation are considered. The initiation length is found to increase first and then decrease with increasing initial droplet diameter, and the effect of droplet size is maximized when the initial droplet diameter is approximately $10\ \mathrm {\mu } {\rm m}$. As the initial droplet diameter varies, unsteady and steady ODWs are observed. In the cases of unsteady ODWs, temperature gradients and non-uniform distributions of the reactant mixture due to droplet evaporation lead to formation of unsteady detonation propagation, therefore leading to fluctuations in the initiation length. The fluctuations in initiation length decrease as the pre-evaporation gas equivalence ratio increases for the unsteady cases. The results further suggest that the relationship between the evaporation layer thickness along the streamline and the corresponding theoretical initiation length can be used to identify an unsteady or steady ODW in cases with large droplets that evaporate behind an oblique shock wave or ODW under the effects of different initial droplet diameters.

JFM classification

Compressible Flows: Detonation waves Multiphase and Particle-laden Flows: Gas/liquid flow Multiphase and Particle-laden Flows: Reacting multiphase flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 984 , 10 April 2024 , A16
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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