基于DRGEP和CSP方法的正癸烷骨架机理简化

采用基于误差的直接关系图法(DRGEP)和基于计算奇异摄动法(CSP)的重要性指标方法对由119个组分、373个反应构成的正癸烷详细动力学机理进行简化,得到了一个由32个物种、73个反应组成的骨架机理.通过将骨架机理点火延迟时间、主要物种浓度及熄火等的模拟结果与详细机理进行对比发现,骨架机理能较好地再现详细机理的特点和燃烧特性.为进一步提高流动方程组与化学反应动力学模型耦合求解的计算效率,提供了一个较好的机理模型;也为先进发动机燃烧室的性能评估和设计定型提供了坚实的理论基础.

Reduction of n-decane detailed combustion reaction mechanism based on DRGEP and CSP

Based on the directed relation graph with error propagation (DRGEP) reduction method and the computational singular perturbation(CSP) importance index method, a detailed mechanism of n-decane with 119 species and 373 reactions was simplified. A skeletal mechanism with 32 species and 73 reactions was thus obtained. By comparing the ignition delay time, the concentration profile of important species and extinction simulation results with the detailed mechanism, we find the skeletal mechanisms could reproduce the characteristics of the detailed mechanism and give the combustion characteristics of n-decane. The development of these models represents a significant step toward coupling of chemical reaction kinetics with computational fluid dynamics, and is a good basis for improving computational efficiency.