摘要
为了研究进气道结构对于转子发动机性能的影响,基于CONVERGE,构建了适合汽油转子发动机工作过程的数值模拟计算模型,并与试验结果进行验证.通过对比端面进气、周边进气和复合进气结构下转子发动机的缸内流场、火焰传播及排放物形成过程,研究了进气道结构对转子发动机燃烧过程的影响.结果表明:不同进气道结构导致缸内流场差异明显;在上止点附近,周边进气的混合气流速比端面和复合进气分别快16.41%和6.57%;3种进气道结构下,周边进气火焰传播最快,燃烧速率最高;与端面进气相比,复合进气的峰值缸压提升6.05%,所对应的曲轴转角提前4.95°;在排气门开启时刻,端面进气方式下NO_x排放最低,复合进气的CO排放比端面进气降低1.03%.
Based on CONVERGE software,a numerical simulation model for gasoline Wankel rotary engine was established and validated by the experimental data.The investigation was conducted under the side-ported,peripheral-ported,and combination-ported structure,respectively.Then,the influence of different inlet-ported structures on the combustion process of the engine was studied comparatively,such as the flow field,flame propagation,and emissions formation.Results show that different inlet-ported structures lead to the pronounced difference in the flow field.Compared with the side-ported and combination-ported engines,the mixture velocity of the peripheral-ported engine near the top dead center increases by 16.41%and 6.57%,respectively.The peripheral-ported engine exhibits the fastest flame speed and the highest combustion velocity in all cases.The peak in-cylinder pressure of the combinationported engine is 6.05%higher than that of the side-ported engine,and its corresponding crank angle is advanced by 4.95°.When the combustion chamber connected to the exhaust port,the nitric oxide formations of the side-ported engine is the lowest,and the carbon monoxide of the combination-ported decreases by 1.03%,in contrast to the side-ported engine.
作者
纪常伟
马泽东
史程
汪硕峰
杨金鑫
孟昊
JI Changwei;MA Zedong;SHI Cheng;WANG Shuofeng;YANG Jinxin;MENG Hao(College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China;School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2020年第4期393-401,共9页
Journal of Beijing University of Technology
基金
国家自然科学基金资助项目(51976003)
北京市教育委员会科技计划资助项目(KM201510005011)
北京市教育委员会科技计划重点资助项目(KZ201610005005)。
关键词
进气道结构
汽油
转子发动机
缸内流场
燃烧过程
排放
inlet-ported structure
gasoline
rotary engine
flow field
combustion process
emission
