The Role of Flame-Generated Turbulence in the Deflagration-to-Detonation Transition
The Role of Flame-Generated Turbulence in the Deflagration-to-Detonation Transition
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火焰产生的湍流在爆燃到爆炸转变中的作用
DOI：
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发表时间：
2017
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通讯作者：
A. Poludnenko
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作者：
A. Poludnenko
尽管进行了几十年的研究，但对控制燃烧-爆震（DDT）转变的基本物理机制的理解仍然很难理解。从根本上说，通过DDT引爆点火需要两个基本成分。首先，火焰必须从层流燃烧状态的典型的高亚音速速度显著加速，并且必须在系统中形成足够大的超压。第二，一旦形成强烈的冲击波，就必须发生实际的爆炸点火。关于滴滴涕的这两个方面，仍有无数根本性的未决问题。事实上，这一过程的极端多尺度、多物理性质可以说使DDT成为经典物理学的“大挑战”问题之一，任何有意义的进展都需要在实验、理论和数值模拟方面取得革命性的突破。
Despite decades of research, understanding of the basic physical mechanisms governing the deflagration-todetonation (DDT) transition still remains largely elusive. Fundamentally, detonation ignition through DDT requires two basic ingredients. First, the flame must be significantly accelerated from the typical highly subsonic speeds characteristic of laminar combustion regimes, and sufficiently large overpressures must be formed in the system. Second, once strong shocks are formed, actual detonation ignition must take place. Countless open questions of fundamental nature remain concerning both of these aspects of DDT. In fact, an extreme multi-scale, multiphysics nature of this process arguably make DDT one of the ”Grand Challenge” problems of classical physics, and any meaningful advances toward its conclusive resolution would require revolutionary breakthroughs in experiments, theory, and numerical modeling.