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Numerical investigation of turbulent hydrogen combustion in a SCRAMJET using flamelet modeling

机译:基于小火焰模型的SCRAMJET湍流氢燃烧数值研究

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摘要

A numerical method is presented for the simulation of turbulent diffusion flames in complex compressible flow fields. The method uses a two equation k-εturbulence model combined with a stretched laminar flamelet model for turbulence diffusion flames as a mathematical description of the flame. Coupling between turbulence and non-equilibrium chemistry is achieved via a statistical description of the mixture fraction with a presumed β-probability density function (PDF) and a mean turbulent strain rate acting on the flame. The governing equations are solved by means of a fully implicit finite volume scheme on unstructured triangulated grids using an approximate Riemann solver for the covective fluxes and a central scheme for the viscous flues.
机译:提出了一种数值方法,用于模拟复杂可压缩流场中湍流扩散火焰。该方法使用两个方程式k-ε湍流模型与拉伸层流小火焰模型相结合来求解湍流扩散火焰,作为火焰的数学描述。湍流和非平衡化学之间的耦合通过对混合物组分的统计描述来实现,该混合物组分具有假定的β概率密度函数(PDF)和作用在火焰上的平均湍流应变率。通过对流通量的近似Riemann求解器和粘性烟道的中心方案,通过对非结构化三角网格的完全隐式有限体积方案求解控制方程。

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