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Investigation of piston bowl geometry and speed effects in a motored HSDI diesel engine using a CFD against a quasi-dimensional model

机译：使用CFD对准尺寸模型研究电动HSDI柴油发动机中活塞碗的几何形状和速度影响

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摘要

The present work investigates the effect of varying the combustion chamber geometry and engine rotational speed on the gas flow and temperature field, using a new quasi-dimensional engine simulation model in conjunction with an in-house developed computational fluid dynamics (CFD) code served to validate the predicted in-cylinder flow field and gas temperature distribution calculated by the quasi-dimensional model, for three alternative piston bowl geometries and three rotational speeds. This CFD code can simulate three-dimensional curvilinear domains using the finite volume method in a collocated grid; it solves the generalized transport equation for the conservation of mass, momentum and energy, and incorporates the standard κ-ε turbulence model with some slight modifications to introduce the compressibility of a fluid in generalized coordinates. On the other hand, the quasi-dimensional model solves the general transport equation for the conservation of mass and energy by a finite volume method throughout the entire in-cylinder volume, while for the estimation of the flow field a new simplified three dimensional air motion model is used. To compare these two models the in-cylinder spatial and temporal temperature distribution, the mean cylinder pressure diagram, as well as the mean in-cylinder radial and axial velocity are examined, for the three piston bowl geometries and the three speeds, for a high speed direct injection (HSDI) diesel engine operating under motoring conditions. From the comparison of calculated results, it becomes apparent that the two models predict similar in-cylinder temperature distributions and mean air velocity fields at each crank angle, for all cases examined. Thus, it is shown that the quasi-dimensional model with the proposed simplified air motion model is capable of capturing the physical effect of combustion chamber geometry and speed on the in-cylinder velocity and temperature field, while needing significantly lower computing time compared to the more detailed and accurate CFD model. On the other hand, the CFD model is more suitable when detailed simulation of the in-cylinder geometry is required and the way the corresponding transport phenomena are affected.
机译：本工作使用新的准尺寸发动机模拟模型以及内部开发的计算流体动力学（CFD）代码，研究了改变燃烧室几何形状和发动机转速对气流和温度场的影响。对于三种可选的活塞碗几何形状和三种转速，验证由准尺寸模型计算的预测缸内流场和气体温度分布。此CFD代码可以在并置网格中使用有限体积方法模拟三维曲线域。它解决了用于守恒质量，动量和能量的广义输运方程，并合并了标准的κ-ε湍流模型，并做了一些细微修改以将流体的可压缩性引入广义坐标系中。另一方面，准三维模型通过有限体积方法在整个缸内体积中求解了用于守恒质量和能量的一般运输方程，而为了估算流场，采用了一种新的简化的三维空气运动使用模型。为了比较这两个模型，检查了三个活塞碗几何形状和三个速度的缸内空间和时间温度分布，平均缸内压力图以及缸内平均径向和轴向速度，高速直喷（HSDI）柴油发动机在机动条件下运行。从计算结果的比较可以看出，对于所有检查的情况，两个模型都可以预测相似的缸内温度分布和每个曲柄角处的平均风速场。因此，表明具有拟议的简化空气运动模型的准维模型能够捕获燃烧室几何形状和速度对缸内速度和温度场的物理影响，而与更详细，准确的CFD模型。另一方面，当需要详细模拟缸内几何形状以及影响相应的运输现象的方式时，CFD模型更适合。

著录项

  • 来源
    《Energy Conversion & Management》 |2010年第3期|470-484|共15页
  • 作者

    C.D. Rakopoulos; rnG.M. Kosmadakis; rnE.G. Pariotis;

  • 作者单位

    Internal Combustion Engines Laboratory, Thermal Engineering Department, School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou St., Zografou Campus, 15780 Athens, Greece;

    rnInternal Combustion Engines Laboratory, Thermal Engineering Department, School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou St., Zografou Campus, 15780 Athens, Greece;

    rnInternal Combustion Engines Laboratory, Thermal Engineering Department, School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou St., Zografou Campus, 15780 Athens, Greece;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CFD model; quasi-dimensional model; piston bowl geometry; rotational speed; HSDI diesel engine; motoring;

    机译：差价合约模型准维度模型;活塞碗的几何形状;转速;HSDI柴油机;驾驶;

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