基于CO-DAC反应机理简化的非预混射流火焰的大涡模拟

摘要

为了研究自相关自适应化学(CO-DAC)在湍流燃烧中的特性,计算了湍流非预混射流火焰Sandia Flame-D 的大涡模拟,使用了 GRI-Mech 3.0详细化学反应机理以及 CO-DAC 简化方法.计算结果与实验值的对比表明,使用详细化学反应机理和 CO-DAC 机理简化,可以有效捕捉湍流火焰瞬时结构;可以根据燃烧场的特性,自适应地减少化学反应计算量,有效提高计算速度;可以准确模拟火焰的速度、温度分布特性;可以准确模拟火焰中重要中间组分和自由基的组分分布.%In order to investigate the characteristics of correlated dynamic adaptive chemistry(CO-DAC)in turbulent combustion,a LES for nonpremixed jet flame Sandia Flame-D was conducted using GRI-Mech 3.0 detailed chemical mechanism with CO-DAC reduction method.The comparison between simulated results and experimental data dem-onstrates that using detailed chemical mechanism and CO-DAC reduction can efficiently capture the instantaneous structure of turbulent flame,adaptively reduce the number of computations for chemical reaction and speed up the simulation,accurately simulate velocity and temperature profiles,and accurately simulate important immediate spe-cies and radicals profiles based on the characteristics of the combustion field.