Experimental study on the propagation mechanism of acetylene-air detonation waves in a unilaterally intermittently constrained channel

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-08-31 DOI:10.1016/j.expthermflusci.2024.111305
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Abstract

This study experimentally explores the propagation mechanisms of acetylene/air detonation waves within a channel intermittently constrained on one side, utilizing soot foil and high-speed schlieren photography to capture the cellular structure and shock-flame evolution. The experiments revealed that the detonation waves traverse the semi-enclosed channel with various discrete wall configurations on the side in three distinct propagation modes: (I) periodic detonation failure and re-initiation; (II) single extinction and re-initiation; (III) non-extinction. Mode I occurs exclusively when the open area ratio exceeds 0.85, while detonation tends to favour Mode II when the gaps between discrete walls exceed three times the cell size; otherwise, it tends towards Modes III. The re-initiation mechanism of detonation involves curvature shocks inducing local explosions of reactive mixtures through multiple Mach reflections off the discrete walls. The self-sustained propagation mechanism of the detonation wave is maintained by the interaction of strong transverse shocks reflected from discrete walls with the inherent transverse waves within the detonation structure, sustaining the instability of the cellular detonation.

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单侧间歇约束通道中乙炔-空气爆轰波传播机理的实验研究
本研究通过实验探索了乙炔/空气爆轰波在一侧间歇受限的通道内的传播机理,利用烟尘箔和高速schlieren摄影捕捉了细胞结构和冲击火焰的演化过程。实验发现,爆轰波以三种不同的传播模式穿越一侧具有不同离散壁面结构的半封闭通道:(I)周期性爆轰失败和再启动;(II)单次熄灭和再启动;(III)非熄灭。当开阔面积比超过 0.85 时,只发生模式 I,而当离散壁之间的间隙超过电池尺寸的三倍时,起爆倾向于模式 II,否则倾向于模式 III。引爆的再触发机制包括曲率冲击通过离散壁的多次马赫反射诱发反应混合物的局部爆炸。离散壁反射的强横向冲击波与起爆结构内固有的横向波相互作用,维持了起爆波的自持传播机制,从而维持了蜂窝起爆的不稳定性。
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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