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首页> 外文期刊>International journal of engine research >Three-dimensional computational fluid dynamics engine knock prediction and evaluation based on detailed chemistry and detonation theory
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Three-dimensional computational fluid dynamics engine knock prediction and evaluation based on detailed chemistry and detonation theory

机译:基于详细化学和爆轰理论的三维计算流体动力学发动机爆震预测与评价

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>Engine knock is an important phenomenon that needs consideration in the development of gasoline-fueled engines. In our days, this development is supported using numerical simulation tools to further understand and predict in-cylinder processes. In this work, a model tool chain which uses a detailed chemical reaction scheme is proposed to predict the auto-ignition behavior of fuels with different octane ratings and to evaluate the transition from harmless auto-ignitive deflagration to knocking combustion. In our method, the auto-ignition characteristics and the emissions are calculated using a gasoline surrogate reaction scheme containing pathways for oxidation of ethanol, toluene,n-heptane,iso-octane and their mixtures. The combustion is predicted using a combination of the G-equation based flame propagation model utilizing tabulated laminar flame speeds and well-stirred reactors in the burned and unburned zone in three-dimensional Reynolds-averaged Navier–Stokes. Based on the detonation theory by Bradley et al., the character and the severity of the auto-ignition event are evaluated. Using the suggested tool chain, the impact of fuel properties can be efficiently studied, the transition from harmless deflagration to knocking combustion can be illustrated and the severity of the auto-ignition event can be quantified.]]>
机译:<![cdata [ >发动机敲击是在汽油燃料发动机开发中需要考虑的重要现象。在我们的日子里,使用数值模拟工具支持这种发展,以进一步了解和预测缸内过程。在这项工作中,提出了一种使用详细化学反应方案的模型工具链以预测具有不同辛烷值的燃料的自燃行为,并评估从无害的自燃剥离到敲击燃烧的过渡。在我们的方法中,使用含汽油替代反应方案的含汽油替代反应方案来计算含有乙醇,甲苯,<斜体> N - 庚烷,<斜体> ISO -octane的汽油替代反应方案和排放。及其混合物。使用基于G型基于的火焰传播模型的组合来预测燃烧,利用制表层状火焰速度和在三维雷诺平均的Navier-Stokes中的燃烧和未燃烧区域中的漂亮反应器的搅拌反应器。基于Bradley等人的爆轰理论。,评估自动点火事件的性格和严重程度。使用建议的刀具链,可以有效地研究燃料特性的影响,可以说明从无害燃烧到爆震燃烧的过渡,并且可以量化自动点火事件的严重程度。 ]] >

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