用CFD方法研究内燃机配气正时

A CFD Approach for Studying Valve Timing of IC Engines

以1台柴油机为例介绍了1种利用计算流体力学(CFD)数值分析来研究配气正时的方法,并计算了4种工况下不同进气提前角时缸内的充气量和扫气量,分析了进气倒流和缸内工质质量随进气提前角的变化规律。结果表明,内燃机工作过程的CFD分析方法可以成为可变气门正时系统、可变凸轮式系统或非凸轮驱动系统配气正时参数确定的有效手段。

A CFD method of studying valve timing was introduced, and it was used for studying the valve timing of a diesel engine. Different valve-timing schemes under four running conditions were evaluated; inducted air and scavenged air were quantified and the amount of inlet backflow and trapped air in cylinder was analyzed at different inlet advanced angle. The results show that the CFD method can be used as an effective way for determining valve timing of variable valve timing system, variable camshaft system and even non-cam driven valve system.