Physical mechanism of ultrafast flame acceleration.
Physical mechanism of ultrafast flame acceleration.
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DOI：
10.1103/physrevlett.101.164501
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发表时间：
2008-10
影响因子：
8.6
通讯作者：
V. Bychkov;D. Valiev;L. Eriksson
中科院分区：
文献类型：
--
作者：
V. Bychkov;D. Valiev;L. Eriksson
我们解释了现代爆炸触发实验中使用的受阻通道中超快火焰加速的物理机制。事实证明，障碍物之间的延迟燃烧会产生强大的射流，从而驱动加速度。这种机制比由于通道壁处的防滑而导致火焰加速的经典谢尔金场景要强得多。所研究的机制与雷诺数无关，湍流仅起补充作用。火焰前锋呈指数加速；得到增长率的解析公式。该理论通过广泛的直接数值模拟以及与之前的实验的比较得到了验证。
We explain the physical mechanism of ultrafast flame acceleration in obstructed channels used in modern experiments on detonation triggering. It is demonstrated that delayed burning between the obstacles creates a powerful jetflow, driving the acceleration. This mechanism is much stronger than the classical Shelkin scenario of flame acceleration due to nonslip at the channel walls. The mechanism under study is independent of the Reynolds number, with turbulence playing only a supplementary role. The flame front accelerates exponentially; the analytical formula for the growth rate is obtained. The theory is validated by extensive direct numerical simulations and comparison to previous experiments.