In the context of vapour cloud explosion, the flame acceleration process can lead to conditions promoting deflagration to detonation transition (DDT), potentially leading to increased damages in accidental scenarios. This study focuses on this phenomenon by performing simulations of detonation reinitiation for fast flames in the Chapman–Jouguet deflagration regime. It is obtained experimentally by the attenuation of an incident detonation by an array of obstacles. A primary objective of the paper is to demonstrate the ability of the numerical model to reproduce the major experimental trends, namely the variation of the reinitiation propensity for different initial pressures and blockage ratios (BRs). Chemical explosive mode analysis (CEMA) is also adapted to the context of this study, in order to identify locally the propagation regime and to provide insights on the reinitiation mechanism. An a priori validation of the CEMA methodology is first performed on relevant canonical one-dimensional configurations. Subsequently, ensembles of five realizations are computed at different initial pressures and BRs and compared to experimental data. They are shown to reproduce the major observed trends in terms of detonation reinitiation length with respect to the operating conditions, with significant variability from one realization to another. In addition, the reinitiation mechanism is also found to be consistent with experimental observations and a previous numerical study of the same configuration. The CEMA methodology adapted to this context is able to identify locally the different propagation regimes, and to track the highly reactive zones that coherently couple with transverse pressure perturbations, leading to the formation of a strongly reacting kernel which eventually triggers the detonation reinitiation.

在蒸气云爆炸的情况下，火焰加速过程可能导致促进爆燃向爆轰过渡（DDT）的条件，从而可能在意外情况下增加损害。这项研究通过在Chapman–Jouguet爆燃状态下对快速火焰进行起爆重新初始化的模拟，将重点放在了这一现象上。它是通过一系列障碍物减弱入射爆轰而获得的。本文的主要目的是证明数值模型再现主要实验趋势的能力，即针对不同的初始压力和阻塞率（BRs）的重新初始化倾向的变化。化学爆炸模式分析（CEMA）也适用于本研究的背景，为了在本地识别传播机制并提供有关重新初始化机制的见解。一个先验首先对相关的规范一维配置执行CEMA方法论的验证。随后，在不同的初始压力和BRs下计算了五个实现的集合，并将其与实验数据进行了比较。结果表明，它们再现了在爆炸起爆长度方面相对于工况的主要观察趋势，并且从一种实现到另一种实现都具有显着差异。此外，还发现重新初始化机制与实验观察结果和相同配置的先前数值研究一致。适应这种情况的CEMA方法论能够在本地识别不同的传播方式，并跟踪与横向压力扰动连贯耦合的高反应区，