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首页> 外文期刊>Energy Conversion & Management >CFD-based method with an improved ignition model for estimating cyclic variability in a spark-ignition engine fueled with methane
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CFD-based method with an improved ignition model for estimating cyclic variability in a spark-ignition engine fueled with methane

机译：基于CFD的具有改进点火模型的方法，用于估算以甲烷为燃料的火花点火发动机的循环变异性

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摘要

In this work cyclic variability is examined in a methane-fueled spark-ignition (SI) engine. A new numerical approach is developed and integrated into the ignition model of an in-house computational fluid dynamics (CFD) code, with the aim to estimate the effect of this highly-complex phenomenon in engines. This sub-model focuses on small-scale turbulence, with its main feature concerning the prediction of the flame propagation once the relative position of the initial flamelet and the local turbulent eddy is defined. This is accomplished by using a blending of the laminar and turbulent flame speeds at the spark cell, according to the flame surface that lies outside the local eddy, smoothing the transition from the laminar to turbulent combustion regimes. A methodology for estimating the coefficient of variation (COV) of indicated mean effective pressure (IMEP) is then proposed based on the simulation of a large number of closed engine cycles. A validated CFD code including this sub-model is applied for the cyclic variability estimation of a SI engine fueled with methane, for which a complete set of measured data is available. The numerical results are then compared with the measured data, focusing on the minimum and maximum peak pressure and IMEP. The final result is the calculation of the COV of IMEP, once the COV value of the multi-cycle simulations converges according to the criteria selected. Overall, the numerical results are close to the measured data with a relative difference of COV of IMEP about 25%, showing that the developed code can be used to estimate, at least qualitatively, the main parameters of cyclic variability in engines, with the intention to introduce in a next version more mechanisms that contribute to this phenomenon. The ultimate goal is then to direct attention to the effects of different fuels on the cyclic variations and the associated pollutant emissions.
机译：在这项工作中，研究了以甲烷为燃料的火花点火（SI）发动机的循环可变性。开发了一种新的数值方法，并将其集成到内部计算流体动力学（CFD）代码的点火模型中，目的是估计这种高度复杂的现象在发动机中的作用。该子模型专注于小规模湍流，一旦定义了初始小火焰和局部湍流涡流的相对位置，其主要特征便是预测火焰传播。这是通过根据位于局部涡流之外的火焰表面，在火花电池处使用层流和湍流火焰速度的混合来实现的，从而平滑了从层流到湍流燃烧状态的过渡。然后，基于大量封闭发动机循环的仿真，提出了一种估算指示平均有效压力（IMEP）的变异系数（COV）的方法。包含该子模型的经过验证的CFD代码适用于以甲烷为燃料的SI发动机的循环可变性估算，为此可获得完整的测量数据集。然后将数值结果与测量数据进行比较，重点是最小和最大峰值压力以及IMEP。一旦多周期模拟的COV值根据选定的标准收敛，最终结果就是IMEP的COV的计算。总体而言，数值结果接近于实测数据，IMEP的COV相对差异约为25％，这表明所开发的代码至少可以用于定性估算发动机循环可变性的主要参数，目的是在下一版本中引入更多有助于这种现象的机制。最终目的是直接关注不同燃料对周期性变化和相关污染物排放的影响。

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  • 来源
    《Energy Conversion & Management》 |2018年第10期|769-778|共10页
  • 作者

    Kosmadakis G. M.; Rakopoulos D. C.; Arroyo J.; Moreno F.; Munoz M.; Rakopoulos C. D.;

  • 作者单位

    Natl Tech Univ Athens, Sch Mech Engn, Dept Thermal Engn, Internal Combust Engines Lab, 9 Heroon Polytech St,Zografou Campus, Athens 15780, Greece;

    Natl Tech Univ Athens, Sch Mech Engn, Dept Thermal Engn, Internal Combust Engines Lab, 9 Heroon Polytech St,Zografou Campus, Athens 15780, Greece;

    Univ Zaragoza, Dept Mech Engn, Lab Engines, C Maria de Luna S-N, Zaragoza 50018, Spain;

    Univ Zaragoza, Dept Mech Engn, Lab Engines, C Maria de Luna S-N, Zaragoza 50018, Spain;

    Univ Zaragoza, Dept Mech Engn, Lab Engines, C Maria de Luna S-N, Zaragoza 50018, Spain;

    Natl Tech Univ Athens, Sch Mech Engn, Dept Thermal Engn, Internal Combust Engines Lab, 9 Heroon Polytech St,Zografou Campus, Athens 15780, 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

    Cyclic variability; COV of IMEP; Ignition; Methane spark-ignition engine; Combustion; CFD research code;

    机译：循环变化;IMEP的COV;点火;甲烷火花点火发动机;燃烧;CFD研究代码;

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