二甲醚发动机湍流燃烧模型的研究  

Research on the Combustion Characteristics of Dimethyl Ether Engine Using a Coherent Flamelet Model

作　　者：王锡斌[1] 蒋德明[1] 周龙保[1] 潘克煜[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2003年第11期1128-1131,1136,共5页Journal of Xi'an Jiaotong University

基　　金：国家重点基础研究发展规划资助项目 (2 0 0 1CB2 0 92 0 8);教育部博士点基金资助项目 (2 0 0 2 0 6980 44)

摘　　要：根据二甲醚发动机燃烧过程的特点,提出了一个湍流燃烧模型.该湍流燃烧模型在传统的化学动力学模型的基础上,增加了拟序火焰片湍流燃烧模型,以考虑湍流对燃烧的促进作用.数值模拟表明:在发动机中二甲醚油束的贯穿度比柴油短,基本没有碰壁现象;油孔附近的油束上边缘处具有合适的燃料浓度和较高的温度,最先发生自燃;在扩散燃烧时燃料与空气混合速度慢,燃烧速度慢,持续时间长.计算所揭示的现象与试验观察基本相符.A turbulent combustion model was developed according to the combustion characteristics of the dimethyl (DME) engine. The model took into account the influence of turbulence on combustion by adding a coherent flamelet model (CFM) in the original chemical kinetic model to reflect the turbulence on combustion promotion. Numerical simulation indicates that at an engine condition DME spray has shorter tip penetration than diesel fuel and no wall impingement is observed. The upper edge of spray near the nozzle would ignite first for its appropriate fuel concentration and higher temperature. In diffusive combustion the combustion rate is slow and the combustion lasts long due to the slow rate of air-fuel mixture formation. The results of numerical simulation are in good agreement with experiments.

关 键 词：二甲醚 湍流 拟序火焰片模型 

分 类 号：TK421.02[动力工程及工程热物理—动力机械及工程]