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利用直接关系图DRG和准稳态假设法QSSA发展了一套详细燃烧机理的简化程序。采用DRG对209组分1 673个反应的煤油详细燃烧动力学机理进行简化,取阈值0.6得到了包含84组分的骨架机理,并对骨架机理和详细机理的结果进行了对比和分析;在骨架机理的基础上采用QSSA方法,进一步得到了包含24组分20方程的简化反应模型。计算表明:84组分的骨架机理在较宽的参数范围内得到的良搅拌反应器(PSR)结果和点火延迟数据都与详细机理一致;采用24组分20方程的总包反应模型得到的点火延迟、组分等数据都与详细机理结果非常接近。总包反应的组分数量满足CFD计算的要求,具有较好的工程应用前景。
Using the direct relation diagram DRG and quasi-steady-state assumptions QSSA developed a simplified procedure for a detailed combustion mechanism. DRG was used to simplify the detailed combustion kinetics of kerosene with 1 673 reactions of component 209, the framework mechanism of 84 components was obtained with a threshold value of 0.6, and the results of the skeleton mechanism and detailed mechanism were compared and analyzed. Based on the QSSA method, a simplified reaction model containing 24 components and 20 equations is obtained. The calculated results show that the results of the good mixing reactor (PSR) and the ignition delay data obtained by the skeleton mechanism of 84 components within a wide range of parameters are in accordance with the detailed mechanism. Ignition by the 24-pack 20-equation generalized reaction model Delay, composition and other data are very close to the detailed mechanism results. The total number of components of the reaction package to meet the CFD calculation requirements, with good prospects for engineering applications.