氢燃料直接注入内燃机的计算流体力学（CFD）分析

2017/09/14   下载量： 6 次

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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公司特色的以图像增强器为核心部件构成的平面激光诱导荧光（PLIF）测试系统对发动机内的氢燃料直接注入过程进行了测量并和计算流体力学（CFD）分析结果进行了对比分析。

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Hydrogen direct-injection (DI) engines offer a wide range of possibilities for
combustion design, such as fuel stratification and multiple injections. Combustion
may involve premixed, partially premixed and non-premixed modes. Key issue of a
non-homogeneous engine operation is an accurate preparation of the fuel/air
mixture. Optical investigations and three-dimensional numerical analysis are applied
with regard to an improvement of the injection parameters and combustion process.
The present work outlines results of Computational Fluid Dynamics (CFD) with
respect to mixture formation and combustion in comparison to experimental data.
Special emphasis is given to the influence of turbulence models on mixture formation
calculations.
As to CFD simulation of stratified operation, the hydrogen mixture formation is of
crucial importance for the subsequent fuel conversion. Consequently, numerical
analysis of the combustion process can only be as accurate as the computation of
the mixture distribution it is based upon. Main influence on mixture formation
calculations of hydrogen-jet propagation was recognised to be the numerical grid as
well as the turbulence modelling approach. The influence of molecular diffusion on
the hydrogen mixture formation process was found to be negligible. The performed
CFD analysis discusses different two-equation turbulence models as well as a
Reynolds Stress Model approach. The influence of the models on results of mixture
formation and turbulent kinetic energy (velocity fluctuations) is demonstrated. CFD
results are validated against optical experimental data from a research engine, using
planar laser induced fluorescence (PLIF) measurements.
Results of combustion analysis are depicted in terms of pressure traces and burn
rates. CFD-results of both port fuel injection and direct injection operation are
compared to experimental data for stoichiometric mixtures at 2000 rpm. A turbulent
flame speed closure approach is applied as combustion model, where the mean
reaction progress is depicted in terms of a transport equation of a progress
variable c˜ . Regarding description of the turbulent flame speed, a model based on
laminar flame speed data as proposed by Zimont (1999) is applied.

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