Large-Eddy Simulation and experiments on non-premixed highly turbulent opposed jet flows
Large-Eddy Simulation and experiments on non-premixed highly turbulent opposed jet flows
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非预混高湍流对向射流的大涡模拟与实验
DOI：
10.1016/j.proci.2010.06.140
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发表时间：
2011
影响因子：
1.9
通讯作者：
A. Kempf
中科院分区：
文献类型：
--
作者：
M.W.A. Pettit;B. Coriton;A. Gomez;A. Kempf
对等温和反应条件下的高湍流非预混逆流进行了实验和计算研究。实验方面，采用热线风速仪（HWA）、二维粒子图像测速仪（PIV）和OH平面激光诱导荧光（PLIF）等技术。在计算上，大涡模拟（LES）与稳定的火焰模型被用来模拟喷嘴内的流动，并在相反的流动区域，使用三种不同的网格分辨率在1.0和0.2毫米（0.5-70万元）。实验和计算相结合的方法，使模拟的交叉验证，并提供了额外的洞察流场。在湍流雷诺数达到900的情况下，对等温和燃烧条件进行了检查，证明了系统达到与实际系统相关的条件的能力。重要的是，保留了紧凑的台式实验的简单性。将计算域扩展到喷嘴内没有光学通道的区域，揭示了专门设计的湍流发生板（TGP）和燃烧器壳体产生超过20%的湍流强度的机制。模拟和测量的数据被认为是在良好的协议的第一和第二速度时刻，轴向速度自相关函数和归一化平均OH荧光。OH为基础的火焰形态的实验和计算之间的相似性也证实了LES成功地捕捉到的关键功能的流量。
An experimental and computational study is presented on highly turbulent non-premixed counterflows under both isothermal and reactive conditions. Experimentally, Hot Wire Anemometry (HWA), two-dimensional Particle Image Velocimetry (PIV) and OH Planar Laser Induced Fluorescence (PLIF) were applied. Computationally, Large-Eddy Simulations (LES) with a steady flamelet model were used to simulate the flow inside the nozzles and in the opposed flow region, using three different grid resolutions between 1.0 and 0.2mm (0.5–70 million cells). The combined experimental and computational approach enabled the cross-validation of the simulation, and provided additional insight into the flow field. Both isothermal and burning conditions were examined with turbulent Reynolds numbers reaching a value of 900, demonstrating the system capability of reaching conditions of relevance to practical systems. Importantly, the simplicity of a compact, bench-top experiment is retained. The extension of the computational domain to a region within the nozzles with no optical access reveals the mechanism by which a specially designed turbulence generating plate (TGP) and burner housing yield turbulence intensities well exceeding 20%. The simulated and measured data were found to be in good agreement for first and second velocity moments, for the axial velocity autocorrelation function and for the normalised mean OH fluorescence. Similarity of OH-based flame morphology between experiments and computations also confirms that the LES successfully captures key features of the flow.