用于非预混燃烧模拟的、对化学源项进行褶皱修正的滤波湍流火焰模型
Filtered turbulent flame model with wrinkling correction on chemical source for nonpremixed combustion simulation
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中文总结 AI 辅助
针对非预混燃烧模拟的滤波湍流火焰模型（FTFM），引入对化学源项的褶皱修正，经两种火焰案例测试验证了其精度与鲁棒性。
中文摘要 AI 辅助
湍流燃烧建模中最关键的挑战之一是化学源项的封闭问题。在最新提出的滤波湍流火焰模型（FTFM）中，可通过逆求解滤波火焰方程，建立滤波标量量与滤波化学源项间的一一对应关系，无需使用传统的假定概率密度函数（PDF）。然而，湍流诱导的火焰褶皱及其带来的化学源项增强，在解析尺度上未被明确考虑。本研究在对撞流火焰构型中解析量化褶皱效应，随后通过将该基于物理的拉伸修正引入化学源项，进一步更新FTFM。通过对非预混悉尼旋流火焰和代尔夫特III火焰的案例测试，验证了本模型具有令人满意的精度与鲁棒性。
英文摘要
One of the most critical challenges in turbulent combustion modeling is the chemical source closure. In the recently developed filtered turbulent flame model (FTFM), a oneto-one correspondence between filtered scalar quantities and filtered chemical sources can be constructed by inversely solving the filtered flame equations, without the use of conventional presumed probability density functions (PDFs). However, the turbulence induced flame wrinkling, and thus the enhancement of the chemical source, has not been explicitly considered at the resolved scale. In the present study, the wrinkling effect is analytically quantified in a counterfow flame setup, from which FTFM is then further updated by incorporating such a physics grounded stretching correction on the chemical source. The satisfactory accuracy and robustness of the present model are justified from case tests of the non-premixed Sydney swirl flame and the Delft III flame.
