确定火花辅助压缩点火过程中燃烧可变性原因所需要的实验度量指标

2017/09/14   下载量： 6 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 电学性能>点火脉冲测试
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汽车发动机时间分辨多参两成像测试系统，研究了确定火花辅助压缩点火过程中燃烧可变性原因所需要的实验度量指标。

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方案详情

Spark-assisted compression ignition, SACI, can be used to control the combustion
phasing of compression-ignition gasoline engines. However, implementation of this technique
can be confounded by cyclic variability. The purpose of this paper is to define experimental
metrics that describe the SACI process and to demonstrate the use of these metrics for
identifying the source(s) of cyclic variability during the SACI process.
This study focused on a light load condition (7 mg/cycle, 200 kPa i.m.e.p.), where spray-guided
direct fuel injection with spark ignition and an exhaust-rebreathing strategy was employed to
achieve flame propagation, which led to compression ignition. This study employed a
combination of measurements including pressure-based heat-release analysis, spark-discharge
voltage/current measurements, and cycle-resolved combustion imaging. Based on these
measurements, four distinct combustion periods were identified; namely, the spark discharge,
the early kernel growth (EKG), flame propagation, and the compression ignition periods. Metrics
were defined to characterize each period and used to identify the contribution of each period to
the cyclic variability of the main heat release. For the light load condition studied here, the EKG
period had the largest effect on the crank angle (CA) position of 50 per cent mass burned, CA50.
The spark-discharge event may affect CA50 indirectly through its influence on EKG. However,
this could not be definitively assessed here since the camera was incapable of recording both the
spark-discharge event and the flame images during cycles of the same tests.

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 由湍流边界层瞬态层析PIV测量推导出压力信息

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北京欧兰科技发展有限公司
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