非同步气门正时对高速汽油机进气及燃烧过程的影响

发布时间：2018-01-25 00:00

本文关键词： 内燃机五气门汽油机非同步气门燃烧湍动能性能排放　出处：《内燃机工程》2016年02期 　论文类型：期刊论文

【摘要】：结合某高速进气道喷射五气门汽油机,采用CFD技术和台架试验手段研究了同步与非同步气门正时对高速汽油机进气和燃烧过程的影响。CFD分析结果表明:非同步气门正时能够加强缸内气体流动,提高点火时刻的缸内湍动能,有利于火焰的快速传播,提高燃烧速率。试验结果表明:进气门2提前20°开启,比其他进气门开启时刻的扭矩提高了约3.1%,燃油消耗率降低了约4.2%;进气门2推迟20°开启燃油消耗率降低了约2.6%,发动机扭矩略微降低。非同步气门正时下,发动机HC和CO排放量均降低,进气门2提前20°开启由于缸内温度较高,NO_x排放量增加了约11.3%。进气门2推迟20°开启由于缸内进气量较低,NO_x排放量降低了约6.7%。
[Abstract]:A five-valve gasoline engine is injected with a high speed inlet. The effects of synchronous and asynchronous valve timing on the intake and combustion process of high speed gasoline engine were studied by means of CFD technology and bench test. Asynchronous valve timing can enhance the flow of gas in the cylinder. The increase of the turbulent kinetic energy in cylinder at the ignition time is beneficial to the rapid flame propagation and the increase of the combustion rate. The experimental results show that the inlet valve 2 opens 20 掳ahead of time. Compared with other intake valve opening moment torque increased about 3.1 percent, fuel consumption reduced by about 4.2 percent; The fuel consumption rate of intake valve 2 is reduced by 20 掳opening and the engine torque is slightly reduced. The HC and CO emissions of the engine are both reduced when the non-synchronous valve is on time. The intake valve 2 opens 20 掳ahead of time because of the high temperature in the cylinder and the emission of NOX increases by about 11.3%. The inlet valve 2 delays opening by 20 掳because of the lower air intake in the cylinder. NO_x emissions have been reduced by about 6. 7%.
【作者单位】：湖南大学汽车车身先进设计制造国家重点实验室;湖南大学先进动力总成技术研究中心;
【基金】：国家“八六三”高技术研究发展计划项目(2012AA111703) 湖南省研究生科研创新项目(CX2015B088)
【分类号】：TK411
【正文快照】： 0概述高速点燃式汽油机被广泛应用于船舶及游艇上,但汽油机转速的提高使缸内燃烧过程所用的时间比车用汽油机短,很容易造成缸内燃烧不充分,进而导致发动机油耗和排放的增加[1]。由于能源危机和日益严重的环境问题,特别是石油短缺和大气污染[2-3],迫切需要研究新的方法来改善发

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