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Large eddy simulations and rotational CARS/PIV/PLIF measurements of a lean premixed low swirl stabilized flame

机译:稀薄的预混合低涡流稳定火焰的大型涡流模拟和旋转CARS / PIV / PLIF测量

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This paper reports on numerical and experimental studies of a lean premixed low swirl stabilized methane/air flame. The burner is made up of a central perforated plate and an annular swirler. A premixed methane/air mixture at an equivalence ratio of 0.62 is injected to an ambient co-flow of air through the burner under atmospheric pressure and room temperature condition with a Reynolds number of 30,000. Stereoscopic Particle Image Velocimetry (PIV) and simultaneous OH/acetone Planar Laser Induced Fluorescence (PLIF) are used to characterize the flame front and the turbulence field downstream of the burner. The flame is stabilized in the low speed central region and in the inner shear-layer vortices, where ambient air dilution to the flame is found to eventually quench the reactions downstream. Rotational Coherent Anti-Stokes Raman Spectroscopy (RCARS) measurements are carried out to characterize the temperature field and the relative oxygen mole fraction field, which enables quantification of the air dilution to the flame. The experimental data provides a challenging test case for numerical simulation models owing to the stratification of the mixture and quenching of the flame. Large eddy simulations are carried out using a three-scalar level-set G-equation flamelet model, which is shown to capture the basic flame characteristics and quenching at the trailing edge of the flame.
机译:本文报道了一种稀薄的预混合低涡流稳定甲烷/空气火焰的数值和实验研究。燃烧器由中央穿孔板和环形旋流器组成。当量比为0.62的预混合甲烷/空气混合物在大气压和室温条件下以雷诺数为30,000通过燃烧器注入到周围空气中。立体粒子图像测速(PIV)和同时OH /丙酮平面激光诱导荧光(PLIF)用于表征燃烧器下游的火焰前沿和湍流场。火焰在低速中心区域和内部剪切层涡流中稳定,在那里发现周围空气对火焰的稀释最终终止了下游的反应。进行了旋转相干反斯托克斯拉曼光谱(RCARS)测量,以表征温度场和相对氧摩尔分数场,从而能够量化空气对火焰的稀释度。由于混合物的分层和火焰的淬灭,实验数据为数值模拟模型提供了具有挑战性的测试案例。使用三标量水平集G方程小火焰模型进行了大涡模拟,该模型显示出基本的火焰特性并在火焰的后沿淬火。

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