Effect of H2/O2 concentration gradient on detonation re-initiation behind the pre-detonator tube

IF 3.1 2区物理与天体物理 Q1 ENGINEERING, AEROSPACE

Acta Astronautica Pub Date : 2025-04-06 DOI:10.1016/j.actaastro.2025.04.013

Jianglong Guo , Jianfeng Pan , Chao Jiang , Yi Zhang , Chenlong Li , Genglin Ge , Muhammad Nauman , Wenming Yang

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引用次数: 0

Abstract

A numerical study on the effect of H₂/O₂ concentration gradient on detonation re-initiation behind the pre-detonator tube was carried out using an OpenFOAM based solver DCRFoam. Simulations of the processes rely on solving the Navier-Stokes equations. The results indicate that the cellular size increases with the increase of hydrogen volume fraction. And the decoupled degree of detonation is higher in the rich fuel region. The decoupled shock propagates faster but exhibit lower intensity in the rich fuel region. When the concentration gradient increases to 2.22 m^-1 and 4.44 m^-1, the unburned mixture is ignited to form a transverse detonation. When the concentration gradient increases to 5.55 m^-1 and 6.66 m^-1, the triple point in the rich fuel region is decoupled. The decoupled triple point collides with the rich fuel wall to generate a hot spot. The energy of the hot spot is too small to ignite the unburned mixture to form a transverse detonation. The diffraction, re-initiation, and self-sustained detonation processes behind the pre-detonator tube are similar under different concentration gradients. The key to the detonation re-initiation is to form a hot spot. And the formation of a transverse wave is essential to the development of self-sustained detonation. Transverse waves originate from the poor fuel region and exhibit higher intensity in the rich fuel region.

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来源期刊

Acta Astronautica 工程技术-工程：宇航

CiteScore

7.20

自引率

22.90%

发文量

599

审稿时长

53 days

期刊介绍： Acta Astronautica is sponsored by the International Academy of Astronautics. Content is based on original contributions in all fields of basic, engineering, life and social space sciences and of space technology related to: The peaceful scientific exploration of space, Its exploitation for human welfare and progress, Conception, design, development and operation of space-borne and Earth-based systems, In addition to regular issues, the journal publishes selected proceedings of the annual International Astronautical Congress (IAC), transactions of the IAA and special issues on topics of current interest, such as microgravity, space station technology, geostationary orbits, and space economics. Other subject areas include satellite technology, space transportation and communications, space energy, power and propulsion, astrodynamics, extraterrestrial intelligence and Earth observations.