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本文叙述了计算流体力学(或多维计算模型)在计算内燃机流动过程方面的应用,特别是AVL如何应用此方法在设计和研制高速直喷柴油机过程中所做的工作,讨论了理论基础和应用多维流体计算所遇到的问题;介绍了已广泛用于汽车工业的计算程序算出的典型计算结果,包括缸内进气诱导和压缩涡流的二维和三维计算结果和进气歧管内的流动计算结果。所有这些计算的最重要特征是它们能够给出对复杂物理现象的深入理解,此外这一方法还能够提供通过试验很难或不能得到的重要信息。多维模型即可用于设计阶段评估和各种不同设计方案的分析,又可用于发展研制过程中,通过计算不同边界和运转条件下发动机的性能来揭示共同特征和变化趋势。
This paper describes the application of Computational Fluid Dynamics (or multidimensional calculation model) in calculating the internal combustion engine flow, especially how AVL applied this method in the design and development of high-speed direct injection diesel engine. The theoretical foundation and application of multidimensional Fluid Computation Problems encountered; typical results calculated using computational procedures widely used in the automotive industry are presented, including 2D and 3D calculations of in-cylinder induction and compression vortices and flow calculations in the intake manifold . The most important feature of all these calculations is that they give insight into complex physical phenomena and, in addition, provide important information that is hard or impossible to experiment with. Multidimensional models can be used in the design phase assessment and analysis of various design alternatives as well as in the development and development process to reveal common features and trends by calculating engine performance under different boundary and operating conditions.