大涡模拟在内燃机中应用的研究进展

大涡模拟 能够以比较合理的计算成本, 提供更多详细的湍流信息, 故近年来已经广泛地应用于科学和工程领域, 并也成为内燃机缸内湍流流动与燃烧过程模拟计算的最有潜力的数值方法.综合现有研究成果, 对内燃机中大涡模拟的研究进展和模拟方法进行了比较全面的评述.介绍了大涡模拟的基本概念、方法、亚网格模型,着重讨论了内燃机缸内冷态流场、燃油喷雾过程以及两相液雾湍流燃烧大涡模拟的国内外研究进展.最后论述了大涡模拟在内燃机应用中当前需要解决的问题及其发展趋势.

LARGE EDDY SIMULATION FOR INTERNAL COMBUSTION ENGINES: PROGRESS AND PROSPECTS

As one of the most successful methodologies for turbulence modeling in science and engineering application, large eddy simulation (LES) has become one of the most promising models for the study of turbulent flow and combustion in internal combustion engine (ICE) over the past decade, since it can provide detailed information about the three-dimensional transient turbulent in-cylinder processes with reasonable computing cost. In this paper a review of the current status and new developments of researches on LES applications in ICE is given and most significant results are presented. The basic concept, method and subgrid models of LES are outlined, and the development and achievements of LES, both domestic and international, are described with emphasis on the in-cylinder flow field, fuel injection and atomization as well as the two-phase spray turbulent combustion. Finally, existing problems in the current application of LES in ICE and possible solutions are discussed.