项目名称： 非热平衡态等离子体增强甲烷稀燃特性及作用机理研究

项目编号： No.51477135

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 电工技术

项目作者： 穆海宝

作者单位： 西安交通大学

项目金额： 90万元

中文摘要： 近年来非热平衡态等离子体助燃技术在提高燃烧效率和拓展燃烧极限方面表现出良好的应用前景，但是非热平衡态等离子体助燃的内在机制和主导因素仍然不明确。本课题采用光谱诊断、流场测量、燃烧产物分析等手段，对介质阻挡放电等离子体作用下甲烷气体的稀燃特性开展系统研究。分别研究甲烷、合成空气以及甲烷/空气预混气体中的等离子体放电特性，获得放电条件、气流速度等因素对放电特性的影响规律；研究放电等离子体和燃烧区域在空间分离和耦合状态下燃烧特性的变化规律，深入分析温度效应、动力增强效应的影响机制；研究放电等离子体对层流预混火焰结构的影响，明确等离子体放电对流场的作用及对燃烧的影响；在此基础上通过建立等离子体辅助燃烧动力学模型，仿真分析非热平衡态离子体辅助燃烧的作用机理。本课题旨在明确非热平衡态等离子体助燃的内在机制，得到温度、动力学、流场等因素在等离子体助燃中的影响规律，为改善等离子体助燃效果提供技术支撑

中文关键词： 气体放电；等离子体；介质阻挡放电；稀薄燃烧

英文摘要： Non-thermal equilibrium plasma has been reported to be potentially applicable in many combustion scenarios due to its advantage on improving the combustion ef?ciency and reduction of the lean blowoff limit. However, the exact mechanisms for combustion enhancement by plasma are still not sufficiently studied. In this project,the lean combustion characteristics of methane with dielectric barrier discharge are investigated by spectroscopic diagnostics,flow field measurement and combustion products analysis. The discharge characteristics in methane,air,premixed methane/air are investigated respectively with different discharge parameters and flow velocity firstly. Then the discharge is spatially and temporally separated from the combustion reaction zone to study the effect of thermal enhancement and kinetic enhancement respectively. The coupling effect between the plasma and the flame is also investigated.The effect of plasma on flame structure is explored due to ?ow turbulization. After that, numerical model is developed to investigate plasma-assisted combustion kinetic mechanisms.The objectives of this project are to elucidate the fundamental mechanisms of thermal enhancement, kinetic enhancement and turbulization effect and provide technical support for improving the efficiency of plasma-assisted combustion.

英文关键词： gas discharge;plasma;dielectric barrier discharge;lean combustion