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Effects of Dilution and Pressure on Detonation Propagation Across an Inert Layer

Peking University, 100871 Beijing, People’s Republic of China

*Graduate Student, College of Engineering, Center for Applied Physics and Technology, State Key Laboratory for Turbulence and Complex Systems.

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Jingyi Su

Peking University, 100871 Beijing, People’s Republic of China

*Graduate Student, College of Engineering, Center for Applied Physics and Technology, State Key Laboratory for Turbulence and Complex Systems.

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Ralf Deiterding

https://orcid.org/0000-0003-4776-8183

University of Southampton, Southampton, England SO16 7QF, United Kingdom

†Professor, Aerodynamics and Flight Mechanics Research Group.

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and

Zheng Chen

https://orcid.org/0000-0001-7341-6099

Peking University, 100871 Beijing, People’s Republic of China

‡Professor, College of Engineering, Center for Applied Physics and Technology, State Key Laboratory for Turbulence and Complex Systems; (Corresponding Author).

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Published Online:3 Jan 2023https://doi.org/10.2514/1.J062397

Abstract

In explosion accidents, inert layer(s) can be used to dampen or suppress detonation propagation. In detonation engines, the detonation may propagate in an inhomogeneous mixture with inert layer(s). Here, the detonation propagation in hydrogen/oxygen/nitrogen mixtures with a single inert layer normal to the detonation propagation direction was investigated. Six hydrogen/oxygen/nitrogen mixtures with different amounts of nitrogen dilution and at different initial pressures were considered. The emphasis was placed on assessing the effects of nitrogen dilution and pressure on detonation across an inert layer. It was found that successful detonation reinitiation occurs only when the inert layer thickness is below some critical value. The detonation reinitiation process was analyzed. The interactions of transverse waves, the reactive–inert layer interface, and instabilities jointly induced local autoignition/explosions and detonation reinitiation. Counterintuitively, it was found that a thicker inert layer is required to quench a weaker detonation (with more nitrogen dilution or with lower-energy density at lower pressure). With the increase of nitrogen dilution or the decrease of initial pressure, the induction length and cell size of the detonation became larger, which unexpectedly resulted in the larger critical inert layer thickness.

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Acknowledgment

This work was supported by the National Natural Science Foundation of China (no. 52176096).

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Received31 August 2022
Accepted8 December 2022
Published online3 January 2023

Effects of Dilution and Pressure on Detonation Propagation Across an Inert Layer

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