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首页> 外文期刊>Combustion Science and Technology >REDUCTION OF 3D MODELS FOR FAST AND RELIABLE SIMULATIONS OF COMBUSTION IN GDI ENGINES AT FULL LOAD
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REDUCTION OF 3D MODELS FOR FAST AND RELIABLE SIMULATIONS OF COMBUSTION IN GDI ENGINES AT FULL LOAD

机译：GDI发动机满负荷燃烧时快速可靠的3D模型还原

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摘要

The GDI process leads to combustion with lean mixtures which may lead to improved fuel economy and emissions relative to homogeneous spark ignition (SI) engines. To satisfy the different steps of operation, the tuning of GDI engines requires a model with a very short computation times to simulate the engines in the whole operating range and to reduce the number of engine tests which are time consuming and very expensive. Therefore the objective of this paper is to present a reduced model to analyze the combustion process in GDI engines, applied to a homogeneous stoichiometric mode. The objective of the model is to reproduce the same tendencies as those obtained by 3D models, but with a reduced computational time. The 1D model is obtained thanks to a reduction methodology based on the geometry of the combustion front computed with 3D models of the KIVA-II type. The results of the 1D model are compared to those obtained by the KIVA IIGSM under different engine conditions and to the measured pressure. The comparison shows that the 1D model overestimates the maximum cylinder pressure, which has an insignificant effect on the net indicated work per cycle. The results obtained by the 1D model are close to those given by the 3D model, with a much reduced computation time. GDI engine, propagating fronts theory, reduced dimen
机译：GDI过程导致使用稀薄混合气进行燃烧，相对于均质火花点火（SI）发动机，这可能会改善燃油经济性和排放。为了满足不同的操作步骤，GDI引擎的调整需要一个具有非常短计算时间的模型，以在整个工作范围内模拟引擎，并减少耗时且非常昂贵的引擎测试次数。因此，本文的目的是提出一种简化的模型，以分析均质化学计量模式下的GDI发动机的燃烧过程。该模型的目的是重现与3D模型获得的趋势相同的趋势，但要减少计算时间。一维模型的获得归功于基于KIVA-II型3D模型计算出的燃烧锋面几何形状的简化方法。将一维模型的结果与KIVA IIGSM在不同发动机条件下获得的结果以及测得的压力进行比较。比较表明，一维模型高估了最大气缸压力，这对每个周期的净指示功没有显着影响。 1D模型获得的结果与3D模型给出的结果接近，计算时间大大减少。 GDI引擎，传播前沿理论，减小尺寸

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