论文部分内容阅读
每缸采用四气门的发动机能进一步降低排放，提高发动机的动力性和经济性本文介绍了直喷式柴油机的四气门进气系统，分析了该系统在充气效率和燃烧方面的特点文中作者进行了螺旋气道与不同流通面积的切向气道的组合试验讨论了四气门进气系统进气道的流通特性及进气道不同进口流通面积对进气流量和涡流动量的影响研究结果表明采用四气门进气系统，进气流通面积增加３９％；另外，切向气道和螺旋气道的进气流量直接影响着缸内涡流的形成，最佳的涡流效果和切向气道与螺旋气道的流量之比密切相关本文为四气门高速直喷式柴油机的进气系统设计提供了依据
The four-valve engine per cylinder can further reduce emissions and improve the engine’s power and economy This paper introduces the four-valve intake system of direct injection diesel engine, and analyzes the characteristics of the system in charge efficiency and combustion. The combination experiment of spiral airway and tangential airway with different circulation area was carried out. The paper discussed the flow characteristics of the inlet of the four-valve intake system and the influence of different inlet flow areas of the inlet on the intake flow and the vortex momentum The results show that with four-valve intake system, the area of intake air flow increases by 39%. In addition, the inlet flow of tangential airway and spiral airway directly affects the formation of vortex in cylinder, the best vortex effect and tangential airway And the spiral airway flow rate is closely related This paper provides a basis for the design of the intake system of four-valve high-speed direct injection diesel engine