论文部分内容阅读
针对采用概率密度函数(PDF)方法的湍流燃烧数值模拟,基于已有的颗粒层面局部敏感性分析,提出一种改进方法,以高效地估计对反应动力学参数的局部敏感性系数.该方法的两个关键思路为:评估化学反应对组分演化的重要程度;以“当前效应”估计“总体效应”.以部分搅拌反应器(PaSR)为研究对象,通过与直接计算的结果比较,证明了新方法的计算结果可作为直接计算的有效估计,能够有效预测各个化学反应对于系统的相对重要性.“,”For transported probability density function (TPDF) simulations of turbulent combustion,a highly efficient particle-level sensitivity analysis approach is proposed to compute the sensitivity of simulation results with respect to the chemical kinetic parameters.The two key steps in the approach are:1) quantify the importance of chemistry in the species evolution;2) approximate the solutions to particle sensitivity equation by neglecting its historic contribution.The newly proposed approach is applied to simulations of a partially stirred reactor (PaSR),and it is found that this approach is capable of predicting the relative importance of different reactions to the system.