直接喷射火花塞引燃（DISI）引擎进气道产生的流动不稳定性

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 理化分析>加热流动性
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）系统对直接喷射火花塞引燃（DISI）引擎进气道产生的流动不稳定性进行了测试和研究。

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The numerical simulation of the turbulent flow induced by the intake port of a modern
direct injection gasoline engine requires the application of advanced turbulence models
taking into account the unsteady nature of the flow. The validation of such models
necessitates the availability of high-quality, unsteady experimental data. The present
paper describes a comparative analysis between such numerical simulations relying
either on Detached Eddy Simulation (DES) or Scale-Adaptive Simulation (SAS), and
experimental data obtained by High-Speed Particle Image Velocimetry (HS-PIV). The
flow field generated by the cylinder-head of a production four-valve gasoline engine
in a configuration with fixed valve positions has been considered. With an acquisition
frequency of 20 kHz and a mesh size of about 30 million cells, a particularly good
resolution of the turbulent structures was achieved both in the experiment and the
simulation. Post-processing issues become very important for such conditions and
will be also briefly considered.

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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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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