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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >EXAMINATION OF INITIALIZATION AND GEOMETRIC DETAILS ON THE RESULTS OF CFD SIMULATIONS OF DIESEL ENGINES
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EXAMINATION OF INITIALIZATION AND GEOMETRIC DETAILS ON THE RESULTS OF CFD SIMULATIONS OF DIESEL ENGINES

机译：柴油机CFD模拟结果对初始化和几何细节的检验

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摘要

Computational Fluid Dynamic (CFD) simulations using the AVL Fire and Kiva 3v codes were performed to examine commonly accepted techniques and assumptions used when simulating direct injection diesel engines. Simulations of a steady state impulse swirl meter validated the commonly used practice of evaluating the swirl ratio of diesel engines by integrating the valve flow and torque history over discrete valve lift values [1]. The results indicate the simulations capture the complex interactions occurring in the ports, cylinder and honeycomb cell impulse swirl meter. The commonly adopted axisymmetric assumption for an engine with a centrally located injector was tested by comparing the swirl and emissions history for a motored case and a double injection low temperature combustion case. Consideration of the detailed engine geometry including valve recesses in the piston and the head lowered the peak swirl ratio at TDC by approximately 10% compared to the simplified no-recess case. The corresponding combusting cases also had different heat release and emissions predictions but could be partially compensated for by lowering the initial swirl ratio for the axisymmetric case.
机译：进行了使用AVL Fire和Kiva 3v代码的计算流体动力学（CFD）模拟，以检查模拟直喷柴油机时常用的技术和假设。稳态脉冲旋流仪的仿真通过在离散的气门升程值上集成气门流量和扭矩历史记录来验证评估柴油机涡流比的常用方法[1]。结果表明，仿真捕获了端口，圆柱体和蜂窝单元脉冲旋流仪中发生的复杂相互作用。通过比较机动壳和双喷射低温燃烧壳的涡旋和排放历史，测试了具有居中位置的喷油器的发动机通常采用的轴对称假设。与简化的无间隙情况相比，考虑到详细的发动机几何形状（包括活塞和缸盖中的气门凹槽），TDC处的峰值涡流比降低了约10％。相应的燃烧情况也具有不同的热量释放和排放预测，但可以通过降低轴对称情况的初始涡流比来部分补偿。

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