Sensitivity analysis of transfer functions of laminar flames
Sensitivity analysis of transfer functions of laminar flames
复制标题
层流火焰传递函数的敏感性分析
DOI：
10.1016/j.combustflame.2011.05.013
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发表时间：
2011
影响因子：
4.4
通讯作者：
T. Poinsot
中科院分区：
文献类型：
--
作者：
F. Duchaine;F. Boudy;D. Durox;T. Poinsot
采用直接数值模拟方法研究了甲烷/空气层流预混火焰对声强迫的敏感性，以确定哪些参数控制火焰传递函数。五个参数是不同的：（1）火焰速度sL，（2）已燃烧气体的膨胀角α，（3）进气温度Ta，（4）进气道温度Td和（5）燃烧室壁温Tw。对于Boudy等人[1]的轴对称火焰和Kornilov等人[2]的狭缝火焰，计算了火焰传递函数的延迟。首先计算稳态火焰，并与火焰形状和速度场的实验数据进行比较。然后，火焰以不同的频率被强制。直接数值模拟再现火焰传递函数正确。火焰传递函数的灵敏度分析是通过逐个改变参数并测量它们对延迟的影响来完成的。分析表明，火焰速度s和进气道温度T是控制火焰延迟的两个参数，而火焰传递函数延迟的任何精确计算都必须首先对这两个量有适当的模型。
The sensitivity of laminar premixed methane/air flames responses to acoustic forcing is investigated using direct numerical simulation to determine which parameters control their flame transfer function. Five parameters are varied: (1) the flame speed sL, (2) the expansion angle of the burnt gases α, (3) the inlet air temperature Ta, (4) the inlet duct temperature Tdand (5) the combustor wall temperature Tw. The delay of the flame transfer function is computed for the axisymetric flames of Boudy et al. [1] and the slot flames of Kornilov et al. [2]. Stationary flames are first computed and compared to experimental data in terms of flame shape and velocity fields. The flames are then forced at different frequencies. Direct numerical simulations reproduce the flame transfer functions correctly. The sensitivity analysis of the flame transfer function is done by changing parameters one by one and measuring their effect on the delay. This analysis reveals that the flame speed sLand the inlet duct temperature Tdare the two parameters controlling the flame delay and that any precise computation of the flame transfer function delay must first have proper models for these two quantities.