LES-pdf simulation of a spark ignited turbulent methane jet
LES-pdf simulation of a spark ignited turbulent methane jet
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DOI：
10.1016/j.proci.2010.06.076
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
W. Jones;V. N. Prasad
中科院分区：
文献类型：
--
作者：
W. Jones;V. N. Prasad
采用大涡模拟(LES)和过滤概率密度函数(PDF)方程相结合的方法对火花点火的湍流射流火焰进行了数值模拟，并用欧拉随机场方法进行了求解。火花源的能量沉积在热能方程中用高斯分布源项来模拟。对子网格应力采用动态模型，对标量通量采用简单的梯度扩散近似。这种化学由涉及七个物种的全球四步化学表示。着火顺序的不同阶段，即火焰核生长、逆流三重火焰传播和稳定化，与实验数据吻合较好。
A spark ignited turbulent jet flame is simulated using Large Eddy Simulation (LES) in conjunction with the filtered probability density function (pdf) equation approach, which is solved using the Eulerian stochastic field method. The spark energy deposition is mimicked by a gaussian distributed source term in the enthalpy equation. A dynamic model for the sub-grid stresses together with a simple gradient diffusion approximation for the scalar fluxes is adopted. The chemistry is represented by a global 4-step chemistry involving seven species. The different stages of the ignition sequence, namely the flame kernel growth, the triple flame propagation against the flow and the stabilisation were in good agreement with the experimental data.