The University of Southampton
University of Southampton Institutional Repository

反射激波与边界层相互作用引起弱点火和强点火的数值研究

反射激波与边界层相互作用引起弱点火和强点火的数值研究
反射激波与边界层相互作用引起弱点火和强点火的数值研究
In shock tube experiments, the interaction between the reflected shock and boundary layer can induce shock bifurcation and weak ignition. The weak ignition can greatly affect the ignition delay time measurement in a shock tube experiment. In this work, two-dimensional simulations considering detailed chemistry and transport are conducted to investigate the shock bifurcation and non-uniform ignition behind a reflected shock. The objectives are to interpret the formation of shock bifurcation induced by the reflected shock and boundary layer interaction and to investigate the weak ignition and its transition to strong ignition for both hydrogen and dimethyl ether. It is found that the non-uniform reflection of the incident shock at the end wall produces a wedge shaped oblique shock foot at the wall. The wedge-shaped structure results in strong interactions between reflected shock and boundary layer, which induces the shock bifurcation. It is demonstrated that the local high-temperature spots at the foot of the bifurcated shock is caused by viscous dissipation and pressure work. As the post-reflected shock temperature increases, the transition from weak ignition to strong ignition in a stoichiometric hydrogen/oxygen mixture is observed. The relative sensitivity of ignition delay time to the post-reflected shock temperature is introduced to characterize the appearance of weak ignition behind the reflected shock. Unlike in the hydrogen/oxygen mixture, weak ignition is not observed in the stoichiometric dimethylether/oxygen mixture since it has a relatively longer ignition delay time and smaller relative sensitivity.
Shock tube, Shock-boundary layer interaction, Weak ignition
0567-7718
Huang, Chengyang
bf4425e8-c7a9-4b8f-ae7f-956a81fe2a17
Wang, Yuan
55cbf3f2-22b6-4c0f-a9dc-351a288d9469
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Yu, Dehai
f3943c7f-bb58-49e1-a839-dff2939c5bef
Chen, Zheng
d07c1910-ab71-4efe-8c09-cd6adea14404
Huang, Chengyang
bf4425e8-c7a9-4b8f-ae7f-956a81fe2a17
Wang, Yuan
55cbf3f2-22b6-4c0f-a9dc-351a288d9469
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Yu, Dehai
f3943c7f-bb58-49e1-a839-dff2939c5bef
Chen, Zheng
d07c1910-ab71-4efe-8c09-cd6adea14404

Huang, Chengyang, Wang, Yuan, Deiterding, Ralf, Yu, Dehai and Chen, Zheng (2022) 反射激波与边界层相互作用引起弱点火和强点火的数值研究. Acta Mechanica Sinica, 38 (2), [121466]. (doi:10.1007/s10409-021-09011-x).

Record type: Article

Abstract

In shock tube experiments, the interaction between the reflected shock and boundary layer can induce shock bifurcation and weak ignition. The weak ignition can greatly affect the ignition delay time measurement in a shock tube experiment. In this work, two-dimensional simulations considering detailed chemistry and transport are conducted to investigate the shock bifurcation and non-uniform ignition behind a reflected shock. The objectives are to interpret the formation of shock bifurcation induced by the reflected shock and boundary layer interaction and to investigate the weak ignition and its transition to strong ignition for both hydrogen and dimethyl ether. It is found that the non-uniform reflection of the incident shock at the end wall produces a wedge shaped oblique shock foot at the wall. The wedge-shaped structure results in strong interactions between reflected shock and boundary layer, which induces the shock bifurcation. It is demonstrated that the local high-temperature spots at the foot of the bifurcated shock is caused by viscous dissipation and pressure work. As the post-reflected shock temperature increases, the transition from weak ignition to strong ignition in a stoichiometric hydrogen/oxygen mixture is observed. The relative sensitivity of ignition delay time to the post-reflected shock temperature is introduced to characterize the appearance of weak ignition behind the reflected shock. Unlike in the hydrogen/oxygen mixture, weak ignition is not observed in the stoichiometric dimethylether/oxygen mixture since it has a relatively longer ignition delay time and smaller relative sensitivity.

Text
Weak Ignition_HCY_V7 - Accepted Manuscript
Download (2MB)
Text
Huang2022_Article_NumericalStudiesOnWeakAndStron - Version of Record
Restricted to Repository staff only
Request a copy

More information

Accepted/In Press date: 8 October 2021
e-pub ahead of print date: 7 January 2022
Published date: 7 January 2022
Additional Information: Funding Information: This work was supported by the National Natural Science Foundation of China (Grant Nos. 52006001, and 52176096). We thank Prof. Shengkai Wang at Peking University, Dr. Song Chen at Technische Universität München and Dr. Wang Han at University of Edinburgh for helpful discussion. Publisher Copyright: © 2022, The Chinese Society of Theoretical and Applied Mechanics and Springer-Verlag GmbH Germany, part of Springer Nature.
Alternative titles: Numerical studies on weak and strong ignition induced by reflected shock and boundary layer interaction
Keywords: Shock tube, Shock-boundary layer interaction, Weak ignition

Identifiers

Local EPrints ID: 458051
URI: http://eprints.soton.ac.uk/id/eprint/458051
ISSN: 0567-7718
PURE UUID: 575a554d-6dd3-4699-b6a7-e0db4163d2e7
ORCID for Ralf Deiterding: ORCID iD orcid.org/0000-0003-4776-8183

Catalogue record

Date deposited: 27 Jun 2022 17:09
Last modified: 29 Jun 2022 01:49

Export record

Altmetrics

Contributors

Author: Chengyang Huang
Author: Yuan Wang
Author: Ralf Deiterding ORCID iD
Author: Dehai Yu
Author: Zheng Chen

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×