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首页> 外文期刊>Combustion Science and Technology >Physical mechanisms that cause intermittency that presages combustion instability and blowout in a turbulent lifted jet flame combustor
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Physical mechanisms that cause intermittency that presages combustion instability and blowout in a turbulent lifted jet flame combustor

机译：导致间歇性的物理机制，预示着湍流举升式火焰燃烧器中的燃烧不稳定性和爆燃

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摘要

The physics of intermittent dynamics that presages the onset of impending combustion instability and blowout in a turbulent lifted jet flame combustor is investigated. It is observed that the transition from combustion noise to combustion instability happens via intermittency while varying the relative location of the burner inside a confinement as a bifurcation parameter. For further change in burner location past the condition of combustion instability, the intermittency before the flame blows out is once again observed. The authors show that the coupled interaction of flow, flame dynamics, and combustion chamber acoustics is the physical reason for the occurrence of intermittency prior to combustion instability. In contrast, intermittent dynamics that presages blowout occurs due to the interplay between flame blowout precursor events and the driving of high-amplitude oscillations as the flame propagates towards the burner.
机译：研究了间歇动力学的物理原理，这种动力学预示了湍流举升式火焰燃烧器中即将发生的燃烧不稳定性和爆燃。可以看出，从燃烧噪声到燃烧不稳定性的转变是通过间歇性发生的，同时改变燃烧器在限制区内的相对位置作为分叉参数。为了进一步改变燃烧器的位置，使其超过燃烧不稳定的条件，再次观察到火焰熄灭之前的间歇性。作者表明，流动，火焰动力学和燃烧室声学的耦合相互作用是燃烧不稳定之前发生间歇性现象的物理原因。相反，由于火焰朝前燃烧事件和火焰朝着燃烧器传播时高振幅振荡的驱动之间的相互作用，会发生预示爆炸的间歇动力学。

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