双稳态湍动旋流火焰中进动涡核（PVC）形成和火焰形状变化之间瞬态耦合的实验研究

2017/07/18   下载量： 4 次

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利用LaVisin公司提供的高速CMOS相机和高速图像增强器HS-IRO构成一套时间分辨PIV和PLIF联合测试系统，用于分析双稳态湍动旋流火焰中进动涡核（PVC）形成和火焰形状变化之间瞬态耦合过程。

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The dynamics of a bi-stable swirl flame in a gas turbine model combustor is studied using simultaneous PIV and
OH-PLIF at 10 kHz. For most operating conditions, the flames in the combustor either feature a steady V-shape or a
steady M-shape. A hydrodynamic instability in the form of the so-called precessing vortex core (PVC) occurs only
for the M-shaped flames. For the V-flames, the PVC is suppressed due to radial density gradients at the burner nozzle
as shown in an accompanying study (Oberleithner et al., Proc 7th Euro Comb Meeting 2015). At some intermediate
operating conditions, bi-stable flames occur where the flame alternates randomly between V- and M-shape. This work
investigates a transition from V- to M-shape, focusing on the implied transient formation of a PVC and its role in the
transition of flame type. The measurements reveal a sequence of events where the PVC forms before the transition of
the flame shape. The sequence starts with a slight lift of the flame root due to a random turbulent event, which induces
a density profile that is favorable for formation of the PVC. The subsequently forming PVC creates an unsteady lower
stagnation point that causes a lift-off of the flame root, which finally results in the formation of a detached M-shaped
flame.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 门宽尺度对基于寿命的福斯特共振能量转移(FRET)参数的估计

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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