CAJ | 학술논문

采用直接关系图(DRG)法和敏感性分析(SA)法对包含261种组分、1,338个反应的柴油/甲醇高温氧化机理进行了简化.开发了适用于层流火焰模型的DRG简化程序,取阈值0.01得到包含65种组分、409个反应的初步简化机理,将该机理与详细机理的模拟结果进行了对比分析;在初步简化结果的基础上,采用 SA 方法进一步得到包含61种组分、151个反应的简化机理.简化机理对参比燃料中甲苯和产物中苯的模拟结果与层流火焰的试验值吻合较好,能反映碳烟前驱体的演化过程;氧化剂、主要产物以及其他参比燃料的预测值与试验值接近,可以描绘层流预混火焰结构;简化机理与预测双燃料着火的 23 步反应机理结合后,应用到缸内燃烧的三维模拟中,可以较为准确地预测缸内压力和放热率的变化.
채용직접관계도(DRG)법화민감성분석(SA)법대포함261충조분、1,338개반응적시유/갑순고온양화궤리진행료간화.개발료괄용우층류화염모형적DRG간화정서,취역치0.01득도포함65충조분、409개반응적초보간화궤리,장해궤리여상세궤리적모의결과진행료대비분석;재초보간화결과적기출상,채용 SA 방법진일보득도포함61충조분、151개반응적간화궤리.간화궤리대삼비연료중갑분화산물중분적모의결과여층류화염적시험치문합교호,능반영탄연전구체적연화과정;양화제、주요산물이급기타삼비연료적예측치여시험치접근,가이묘회층류예혼화염결구;간화궤리여예측쌍연료착화적 23 보반응궤리결합후,응용도항내연소적삼유모의중,가이교위준학지예측항내압력화방열솔적변화.
The direct relation graph(DRG)method and the sensitivity analysis(SA)method were used to reduce the diesel/methanol high-temperature oxidation mechanism,which contains 261 species and 1,338 reactions. A mecha-nism reduction program for laminar premixed flame was developed based on the DRG theory. By setting the threshold to 0. 01 in the program,a primary reduction mechanism was obtained,which contains 65 species and 409 reactions. Comparison and analysis were done between the detailed and reduced mechanisms. Based on the primary result,a reduced mechanism with 61 species and 151 reactions was generated by SA method. The simulation results for toluene and benzene in the reduced mechanism,which can reflect the evolutionary process of soot precursor,agreed well with the experimental values in the laminar premixed flame. The reduced mechanism can also describe the structure of the laminar premixed flame by giving approximate results of oxidant,major products and other reference fuels com-pared with the experimental values. When combined with the 23 steps mechanism,which is used to predict the igni-tion time of the diesel/methanol combined combustion,and applied to the three-dimensional simulation of in-cylinder combustion process,the reduced mechanism can reflect the changing process of the pressure and heat release rate in the cylinder more accurately.