车用发动机
車用髮動機
차용발동궤
2015年
3期
60-64
,共5页
徐丹%杨青%孟凡腾%孙柏刚%郭巨寿
徐丹%楊青%孟凡騰%孫柏剛%郭巨壽
서단%양청%맹범등%손백강%곽거수
混合动力%Atkinson循环发动机%燃烧室%湍动能
混閤動力%Atkinson循環髮動機%燃燒室%湍動能
혼합동력%Atkinson순배발동궤%연소실%단동능
hybrid%Atkinson cycle engine%combustion chamber%turbulent kinetic energy
基于Atkinson理论循环建立混合动力汽油机的性能仿真模型,确定出合适的压缩比与配气正时。分别采用增加活塞顶面凸起高度(上凸型燃烧室)和减小缸盖上燃烧室高度的方式来满足Atkinson循环汽油机对压缩比的要求。同时为适应紧凑结构减小气门升程、直径(紧凑型燃烧室)。通过三维C FD计算分析,比较了两种燃烧室缸内燃烧及流动特性,发现紧凑型燃烧室能够在火核形成及扩散时期在缸内产生更高的湍动能,有利于加快火焰传播,使燃烧持续期缩短9.8%~24.4%,可显著提高燃油经济性。在混合动力用 Atkinson循环发动机开发中使用紧凑型燃烧室,具有重要的应用价值。
基于Atkinson理論循環建立混閤動力汽油機的性能倣真模型,確定齣閤適的壓縮比與配氣正時。分彆採用增加活塞頂麵凸起高度(上凸型燃燒室)和減小缸蓋上燃燒室高度的方式來滿足Atkinson循環汽油機對壓縮比的要求。同時為適應緊湊結構減小氣門升程、直徑(緊湊型燃燒室)。通過三維C FD計算分析,比較瞭兩種燃燒室缸內燃燒及流動特性,髮現緊湊型燃燒室能夠在火覈形成及擴散時期在缸內產生更高的湍動能,有利于加快火燄傳播,使燃燒持續期縮短9.8%~24.4%,可顯著提高燃油經濟性。在混閤動力用 Atkinson循環髮動機開髮中使用緊湊型燃燒室,具有重要的應用價值。
기우Atkinson이론순배건립혼합동력기유궤적성능방진모형,학정출합괄적압축비여배기정시。분별채용증가활새정면철기고도(상철형연소실)화감소항개상연소실고도적방식래만족Atkinson순배기유궤대압축비적요구。동시위괄응긴주결구감소기문승정、직경(긴주형연소실)。통과삼유C FD계산분석,비교료량충연소실항내연소급류동특성,발현긴주형연소실능구재화핵형성급확산시기재항내산생경고적단동능,유리우가쾌화염전파,사연소지속기축단9.8%~24.4%,가현저제고연유경제성。재혼합동력용 Atkinson순배발동궤개발중사용긴주형연소실,구유중요적응용개치。
Based on Atkinson theoretical cycle ,the performance simulation model of hybrid gasoline engine was built and the compression ratio and valve timing were determined .The requirements of compression ratio for Atkinson gasoline engine has been met with increasing the bumped height of piston top surface (convex combustion chamber) and decreasing the height of cylinder head combustion chamber (compact combustion chamber) .With three‐dimensional CFD analysis ,the combustion and flow characteristics of the two types of combustion chambers were compared .The results show that the compact combustion chamber can produce the higher turbulent kinetic energy in the period of flame kernel formation and diffusion ,accelerate the flame propagation and shorten the combustion duration by 9 .8% ~24 .4% with improved fuel economy .The application of compact combustion chamber in the development of hybrid Atkinson cycle engine is of great value .