直喷火花塞引燃（DISI）发动机工作在分层燃烧模式下燃料充量运动和混合物形成的周期性起伏

2017/09/14   下载量： 3 次

方案摘要

方案下载
应用领域 汽车及零部件
检测样本 汽车电子电器
检测项目 热性能>其他
参考标准 暂无

采用LaVision公司的平面激光诱导荧光（PLIF）测试系统和以DaVis软件平台为基础构成的粒子成像测速（PIV）系统对直喷火花塞引燃（DISI）发动机工作在分层燃烧模式下燃料充量运动和混合物形成的周期性起伏现象进行了观测和研究。

方案下载
配置单
方案详情

The processes of an internal combustion engine are subject to cyclic fluctuations, which have direct consequence on the
operational and emission behavior of the engine. Direct injection gasoline engines have fluctuations that are induced and
superimposed by the flow and the injection. In stratified operation they can cause serious operating problems, such as
misfiring. Currently, the state of knowledge on the formation and causes of cyclic fluctuations is rather limited, which can
be attributed to the complex nature of flow instabilities.
Recent analyzes of a direct injection gasoline engine’s cyclic fluctuations of the in-cylinder charge motion and the mixture
formation utilizes laser-optical diagnostics and numerical 3D-calculations. Individual cycles are measured using optical
measurement techniques and pressure indicators for determining flow, mixture formation, and the combustion processes.
Large-scale turbulence and cyclic fluctuations are modeled using 3D-calculations that are performed with a Large Eddy
Simulation (LES). The results of the calculations are used to analyze the formation of cyclic fluctuations and their effect on
injection and mixture formation.
The intensity of the cyclic fluctuations rises dramatically during the injection phase, because of the relationship between
the cyclic fluctuating in-cylinder flow and the injection. These results are confirmed by calculations, which when combined
with reproducible injection predict strongly differing mixture states at the ignition point with significant asymmetries. These
asymmetries with their broad scatter range of mixture formation can explain the stochastic misfires that occur in the
engine.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 采用透明单冲程压缩机用于均质混合进气压缩燃烧（HCCI）的实验研究

文献贡献者

北京欧兰科技发展有限公司
金牌会员 丨 第17年
查看全部资料
相关仪器 更多
相关方案
更多

相关产品

当前位置： 欧兰科技 方案 直喷火花塞引燃（DISI）发动机工作在分层燃烧模式下燃料充量运动和混合物形成的周期性起伏

关注

拨打电话

留言咨询