结合某4气门汽油机进气系统CFD算例及国外相关研究进展,分析了应用涡流比和滚流比作为发动机工质运动强度的度量的不足之处.提出对于稳态CFD分析,可应用流经气门最小流通截面的单位质量工质动能流量与单位质量湍动能流量来评价宏观和微观的工质运动强度,对于进气及压缩过程的瞬态CFD分析,可应用缸内单位质量工质的动能与湍动能来评价宏观和微观的工质运动强度,并探讨了两者在进气及压缩过程的变化规律.%Based on the CFD example of a four-valve gasoline engine intake system and foreign related research progress, the deficiency of measuring engine gas movement intensity with the tumble ratio and swirl ratio was analyzed. For the CFD analysis of steady state, the unit mass kinetic energy and turbulent kinetic energy flow of minimum flow section through valve were pro posed to evaluate the macroscopic and microscopic gas movement intensity. For the transient CFD analysis of intake and com pression process, the in-cylinder unit mass kinetic energy and turbulent kinetic energy were proposed to evaluate the macroscop ic and microcosmic gas movement intensity and their changes in the intake and compression process were further studied.
展开▼
