基于混合物分数和反应进度变量的二维火焰面模型

Two-Dimensional Flamelet Model Based on Mixture Fraction and Progress Variable

基于混合物分数Z和反应进度变量Yc的二维层流火焰面模型,数值研究了混合物分数标量耗散率、反应进度标量耗散率等对Z-Yc区域边界以及部分预混火焰结构的影响.结果表明,混合物分数标量耗散率对火焰结构有较大的影响,在混合物分数标量耗散率较小时产生了双火焰的结构;而反应进度标量耗散率对当量混合附近的结果有明显的影响,尤其是当混合物分数标量耗散率较小时;在稳定燃烧情况下,稳态一维火焰面模型只是二维火焰面模型的一个边界,表明二维火焰面模型方程的解给出的化学热力学参数表包含更多的信息,可用于多机制共存的火焰数值模拟.

Partially premixed laminar flame structure was numerically studied using two-dimensional（2D）steady laminar flamelet model based on mixture fraction Z and progress variable Y~. The effects of mixture fraction scalar dissipation rates and progress variable scalar dissipation rates of the range of the Z - Y~ boundary and the structure of partially premixed flames were studied. Results showed that the variation of mixture fraction dissipation rates has an important effect on the range of Z - Y~ and a double-flame structure is captured at low mixture fraction scalar dissipa- tion rate; reaction progress scalar dissipation rate also plays an important role in the vicinity of the stoichiometric region, especially at low mixture fraction scalar dissipation rate; 1D steady laminar flamelet model is only one boundary of 2D flamelet model, which demonstrates that 2D flamelet model can give more information and is appli- cable to the numerical simulation of hybrid regime combustion.