燃料喷雾的形成和汽油燃料直接喷射（GDI）

2017/09/14   下载量： 5 次

方案摘要

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

采用LaVision公司特色的以DaVis软件平台为基础构成的粒子成像测速（PIV）和喷雾几何形态参数成像测试系统对燃料喷雾的形成和汽油燃料直接喷射（GDI）进行了测试和分析。

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Rather than discuss a single research topic, this paper reviews
the combination of different research facilities and optical diagnostics
used in a project to optimize a homogeneously charged
GDI combustion system for part load conditions to deliver fuel
economy benefits without detrimental emissions by reducing the
gas exchange losses through variable inlet valve actuation.
Fundamental studies of the fuel sprays are described with an
atmospheric and high pressure-temperature spray cell using the
phase Doppler technique and single shot CCD imaging respectively.
These data have been used to initiate and validate CFD
spray modelling of the liquid break-up using a VOF method and as
an input for an empirical spray targeting model. Two single cylinder
GDI engines have been constructed, one optical and one
thermodynamic, with matched performances under part load
conditions. Both engines were operated at standard test points
of 2000 rpm and 2.7 bar IMEP and 3500 rpm and 5.7 bar IMEP
where the IMEP was calculated over a 720° cycle to include
pumping losses. These test points were achieved using four inlet
valve strategies; throttled with standard valve lift profiles, unthrottled
with EIVC for both valves and EIVC with the inlet valves
operating independently to introduce swirl into the in-cylinder
flow. The thermodynamic engine indicated that significant ISFC
gains could be achieved, by up to 17% under part load conditions,
by combining EIVC and only one inlet valve with an early injection
timing. However, the optimum results were dependent on which
of the two valves was opened. The optical engine with the use of
spray imaging and particle image velocimetry highlighted the
reasons being due to superior air-fuel mixing during the open
valve period.

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 确定喷射导引燃烧系统中另外一种点火系统的热动力学潜能

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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