System identification of a large-scale swirled partially premixed combustor using LES and measurements
System identification of a large-scale swirled partially premixed combustor using LES and measurements
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DOI：
10.1080/14685240512331391985
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发表时间：
2005-01-01
影响因子：
1.9
通讯作者：
Krebs, W
中科院分区：
文献类型：
--
作者：
Giauque, A;Selle, L;Krebs, W
用大涡模拟计算了旋流部分预混燃烧器对声激励的强迫响应，并与卡尔斯鲁厄大学的测量结果进行了比较。配置为1：图1是由西门子公司提供的原型工业燃烧器的示意图，其中气体通过两个复杂几何形状的旋流器喷射。由于采用了混合网格和并行计算，模拟集成了这种复杂几何体的很大一部分。最大的旋流器的入口数值被迫为三个声学频率（80，120和250 Hz）和LES数据进行比较，实验结果的燃烧阶段。LES也给访问的强制流拓扑结构，揭示了激励创建大的环形涡流扭曲火焰表面和不稳定的火焰下游。除了这些环形涡，LES还表明，旋进涡核出现时，激励开始。最后，从LES中提取燃烧相位和响应幅度的图，并突出了激励下控制火焰行为的机制。LES获得的阶段也比较通常的“对流相”的估计中使用的雷诺平均代码。这一比较表明，LES提供了一个更好的估计之间的阶段放热和进口速度波动。
The forced response of a swirled partially premixed burner to acoustic excitations is computed with Large Eddy Simulations and compared to measurements performed at University of Karlsruhe. The configuration is a 1: 1 representation of a prototype industrial burner provided by Siemens in which gases are injected through two complex-geometry swirlers. Thanks to hybrid meshes and parallel computations, the simulation integrates a large part of this complex geometry. The inlet of the largest swirler is numerically forced for three acoustic frequencies ( 80, 120 and 250 Hz) and the LES data is compared to experimental results in terms of combustion phase. LES also give access to the forced flow topology, revealing that the excitation creates large toroidal vortices which distort the flame surface and destabilise downstream of the flame. In addition to these toroidal vortices, LES also show that a precessing vortex core appears when excitation is started. Finally maps of combustion phase and response amplitude are extracted from LES and highlight the mechanisms controlling the flame behaviour under excitation. The phases obtained by LES are also compared to usual "convective phase" estimates used in Reynolds Averaged codes. This comparison shows that LES provide a better estimation of the phase between heat release and inlet velocity fluctuations.