聚甲氧基二甲醚-2燃烧动力学模型及试验研究  

Combustion Kinetic Modeling and Experimental Study of Polyoxymethylene Dimethyl Ethers-2(PODE_(2))

作　　者：李宁[1] 赵玉伟 魏衍举[1] 孔祥东 余涛 武颖韬 汤成龙[1] 刘圣华[1] LI Ning;ZHAO Yuwei;WEI Yanju;KONG Xiangdong;YU Tao;WU Yingtao;TANG Chenglong;LIU Shenghua(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Air and Missile Defense College,Air Force Engineering University,Xi’an 710051,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]空军工程大学防空反导学院,西安710051

出　　处：《内燃机工程》2024年第1期98-108,共11页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(52106191,52176128)。

摘　　要：采用试验研究与动力学建模相结合方法,对聚甲氧基二甲醚-2(polyoxymethylene dimethyl ethers-2,PODE_(2))的中低温燃烧特性进行了研究。基于二甲氧基甲烷(dimethoxymethane,DMM)详细反应机理,遵循基于反应类的速率准则构建了PODE_(2)详细化学反应动力学机理,并与文献试验数据进行了验证;在快速压缩机试验平台测量了PODE_(2)在温度范围为550~900 K,当量比为0.5、1.0、2.0时着火延迟时间,结合所构建的详细反应机理,对PODE_(2)中低温条件下自着火过程控制因素进行了分析。结果表明,所构建的PODE_(2)反应机理可以很好地再现试验测量的着火延迟时间,对文献中现有的试验数据均能给出合理的预测。PODE_(2)自着火过程呈现明显的两阶段着火现象,没有表现出负温度系数(negative temperature coefficient,NTC)行为;PODE_(2)第一阶段着火延迟时间在低温段随温度呈线性变化,在720~820 K的中温范围内呈“平台”状,几乎不随温度变化。PODE_(2)低温反应活性来自于3个替代性通道,由氧加成反应开启的典型低温链分支反应序列作用被抑制。The combustion characteristics of polyoxymethylene dimethyl ethers-2(PODE_(2))at medium and low temperatures were investigated by kinetic modeling and experimental study.Following the rection class-based rate rules,a detailed reaction mechanism for PODE_(2)was constructed according to the detailed mechanism of dimethoxymethane(DMM).The PODE_(2)kinetic mechanism was validated against available literature experimental data.Ignition delay time of PODE_(2)was measured in a rapid compression machine(RCM)platform in the temperature range of 650~900 K and at the equivalence ratios of 0.5、1.0、2.0.The controlling factors of PODE_(2)auto-ignition process at medium and low temperatures were analyzed in conjunction with the constructed detailed mechanism.The results show that the constructed PODE_(2)reaction mechanism can well reproduce the experimentally measured ignition delay time.The PODE_(2)auto-ignition shows a clear two-stage ignition phenomenon and does not exhibit any negative temperature coefficient(NTC)behaviors.The first-stage ignition delay time of PODE_(2)varies linearly with temperature in the low temperature range,and shows a plateaus in the mid-temperature range of 720~820 K.The low temperature reactivity of PODE_(2)is derived from three alternative channels,and the typical low temperature chain branching reaction sequence initiated by the oxygen addition reaction is inhibited.

关 键 词：聚甲氧基二甲醚 化学反应动力学 快速压缩机 燃烧动力学模型 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]