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出 处:《汽车工程学报》2012年第3期195-201,共7页Chinese Journal of Automotive Engineering
基 金:重庆市科技攻关计划重点项目(CSTC;2008AC6024)
摘 要:发动机缸内的气流运动对发动机的燃烧、排放物生成关系极大,是影响发动机性能的重要因素之一。为指导结构设计,研究缸内气流运动规律,利用计算流体力学(CFD)软件Fire对某4气门汽油机进气道及缸内流场进行了稳态及瞬态的三维数值模拟计算,着重阐述了滚流在缸内的形成及演变过程,及其湍动能的变化规律。稳态模拟结果和气道试验台试验结果吻合较好。采用动网格技术快速生成计算网格,瞬态模拟给出了缸内速度场和湍动能场,获得了较详细的流场信息。研究结果显示气道结构设计合理,缸内流场中出现明显的滚流,进气引起的明显滚流维持到了压缩终点,且高湍动能区位于火花塞附近,有利于火焰传播。Air movement in the engine is greatly related to combustion and emissions and is one of the most important factors that affect the engine performance. Fire, a computational-fluid-dynamic (CFD) software, was used in steady and instantaneous simulation of flow fields in ports and cylinder to collect data for structural design and to investigate the rule of airflow movement in the cylinder. Especially, the result shows how the tumble is generated and its evolution process, the development of turbulent kinetic energy in the whole cylinder is also obtained. The simulation results and experimental results are in good agreement. Techniques for generating moving meshes were employed to build computational meshes rapidly before velocity and turbulent kinetic energy fields were computed by instantaneous simulation and also more detailed information of flow field is obtained. The results show that the structure of the ports was appropriate, tumbles occurred evidently in the flow field of the cylinder, the tumble caused by the intake stroke exists to the end of the compression stroke, and bigh turbulence kinetic energy field locates near the spark plug, which were conducive to flame diffusion.
分 类 号:TK412[动力工程及工程热物理—动力机械及工程]
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