进气相位对天然气转子发动机流场和燃烧过程的影响  

Influence of Port Timing on Flow Field and Combustion Process of Natural Gas-fueled Rotary Engines

作　　者：范宝伟[1] 潘剑锋[1] 唐爱坤[1] 潘振华[1] 薛宏 

机构地区：[1]江苏大学能源与动力工程学院,镇江212013 [2]加州州立工业大学机械工程系,洛杉矶ca91768

出　　处：《农业机械学报》2015年第7期286-293,共8页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(51376082);江苏省六大人才高峰第八批资助项目(201127);江苏省高校优势学科建设工程资助项目;江苏省普通高校研究生科研创新计划资助项目(CXZZ13-0671)

摘　　要：转子发动机进气相位的改变不仅改变了进气效率,而且对缸内流场以及燃烧过程都产生很大的影响。基于FLUENT软件,通过编程实现了相应的三维动网格模型,添加了合适的湍流模型、燃烧模型、CHEMKIN化学反应机理,建立了基于化学反应动力学的三维动态数值模拟模型,并通过已有实验数据对比验证了模型的可靠性。在此基础上,对不同进气相位的周边进气天然气转子发动机的工作过程进行了数值模拟。计算结果表明:在进气持续期不变的情况下,随着进气开启角的提前,缸内涡团和旋流的强度、充量系数都不断增加,点火位置处的流场湍流度不断增加。火花塞点火后其附近的流场湍流度增加可以大幅度提高燃烧速率,但燃烧行程的整体燃烧速率不是一直随着进气开启角的提前而增大。相同进气持续期下,进气开启角为407°时,火焰传播速度最大,缸内示功图最好,同时NO生成量也最大。For rotary engine,the changes in port timing can bring change,not just to admission efficiency,but to the the flow field and turbulence energy in cylinder. On the basis of the Fluent simulation software,a three-dimensional dynamic simulation model was established through the secondary development to write dynamic mesh programs and choose the reasonable turbulent model,combustion model and CHEMKIN mechanism. The three-dimensional dynamic simulation model based on the chemical reaction kinetics was also validated by using the experimental data. On this basis,the working process of peripherally ported natural gas-fueled rotary engines under different port timings was simulated.The results show that with the intake duration angle unchanged,as the intake opening angle was brought forward,the intensity of the swirls and the vortex blobs,the volumetric coefficient all increased,and the turbulence intensity near the ignition position also increased. The increase of the turbulence intensity near the ignition position can significantly increase combustion rate, but the whole combustion rate in combustion stage did not always increase with advanced intake opening angle. With the intake duration angle unchanged,when the intake opening angle was 407°,the flame propagation speed reached the maximum value,the indicator diagram was the best and the emission of NO was the biggest.

关 键 词：进气相位 天然气 周边进气转子发动机 流场 燃烧过程 三维动态模拟 

分 类 号：TK45[动力工程及工程热物理—动力机械及工程]