掺氢汽油转子机燃烧机理与排放特性的研究

项目名称： 掺氢汽油转子机燃烧机理与排放特性的研究

项目编号： No.51476002

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 能源与动力工程

项目作者： 纪常伟

作者单位： 北京工业大学

项目金额： 83万元

中文摘要： 汽油转子机体积小、重量轻、结构简单，但其油耗和排放高，氢气独特的物化特性能够改善汽油在转子机内的燃烧。研究掺氢汽油燃料在转子机内的雾化、蒸发、扩散及混合特性，探索掺氢改善汽油转子机缸内混合气质量及燃烧和排放的机理。建立掺氢汽油转子机缸内流动模型，研究掺氢对汽油转子机缸内混合气流动及分布规律的影响。耦合掺氢汽油湍流和化学反应动力学模型，进行掺氢汽油转子机工作过程的数值模拟，定量分析和预测掺氢对汽油转子机混合气着火、燃烧和排放物生成的影响规律，揭示氢气的作用机理。开发掺氢汽油转子机燃料供给、燃烧和排放测试系统，在稳态和瞬态工况下，通过台架实验研究掺氢对汽油转子机稀燃界限、热效率、循环变动、滞燃期、燃烧持续期、排放等的影响，确定全工况下实现掺氢汽油转子机高效、稳定、清洁运行的燃料及燃烧控制策略，明确掺氢对汽油转子机性能的改善程度，获得掺氢汽油转子机的燃烧机理和排放特性，为其应用提供基础数据。

中文关键词： 转子内燃机；氢气；汽油；燃烧机理；排放特性

英文摘要： The gasoline rotary enignes, with the advantages of small size, light weight and simple structure, always encounter problems including the increased fuel consumption and elevated exhaust emissions. Hydrogen prosesses many desirable phycochemical properties which avail improving the gasoline combustion in rotary enignes. This subject is carred out to investigatethe atomization, evaporation, diffusion, and fuel-air mixing characteristics in hydrogen-enriched gasoline rotary enignes, and to explore the influencing mechanism of hydrogen enrichment on promoting the mixing quality, improving the combustion, and restraining the emissions formation for gasoline rotary engines. Through establishing the computational model for in-cylinder flow in hydrogen-enriched gasoline rotary engines, the effects of hydrogen enrichment on in-cylinder flow and its spacial distribution in the gasoline rotary enignes are studied. By coupling the turbulence and chemical dynamics models of hydrogen-gasoline blends, the numerical simulations on the operating processes in hydrogen-enriched gasoline rotary enignes are performed to quantatively analyze and predict the effects of hydrogen enrichment on the ignition, combustion, and emissions formation in gasoline rotary enignes, and to reveal the influencing routine of hydrogen enrichment in these processes. Through developing the fuel supplement, combustion and emissions test systems for hydrogen-enriched gasoline rotary engines, the experimental tests are conducted under both steady and transiet operating conditions, to study the influences of hydrogen enrichment on the lean burn limit, thermal efficiency, cyclic variation, ignition delay time, combustion duration, and emissions level for the gasoline rotary engines. The system development and experimental test could provide fuel supplement and combustion controling strategies for realizing the high-efficiency, stable, and clean operation for hydrogen-enriched gasoline rotary engines, specify the degree of improvement in gasoline rotary engine performance with hydrogen enrichment, and obtain the combustion mechanism and emissions characteristics for hydrogen-enriched gasoline rotary engines. These observations and findings could benifit the commercialization of hydrogen-enriched gasoline rotary engines with fundamental data and theoretical models.

英文关键词： Rotary engine;Hydrogen;Gasoline;Combustion mechanism;Emissions characteristic