进气流态对天然气发动机性能影响的试验研究  

Investigation on the Influence of Intake Port Flow Pattern on the Performance of a NG Engine

作　　者：唐志刚 潘永传 李卫 李哲 李亮 刘洪哲 Tang Zhigang;Pan Yongchuan;Li Wei;Li Zhe;Li Liang;Liu Hongzhe(Weichai Power Company Limited,Weifang 261061,China;Weichai Westport Power Company Limited,Weifang 261041,China)

机构地区：[1]潍柴动力股份有限公司,山东潍坊261061 [2]潍柴西港新能源动力股份有限公司,山东潍坊261041

出　　处：《内燃机学报》2023年第5期435-441,共7页Transactions of Csice

基　　金：国家重点研发计划资助项目(2017YFC0211301).

摘　　要：对原涡流进气道进行了改制,设计了具有滚流特征的进气道,在试验台架上分别对匹配这两种进气道的天然气发动机进行了性能测试.结果显示:相同工况和控制参数下,与涡流进气道相比,匹配滚流进气道涡前压力和涡前温度更低,燃气消耗率降低1~2 g/(kW·h),并且缸内压力更高、循环变动更低,燃烧始点(AI 05)和燃烧中心(AI 50)提前2°~3°CA,但燃烧持续期整体长5°~7°CA.进一步分析发现,滚流进气道的性能优势在于可以实现更好的火花塞扫气,但滚流进气道加速燃烧的效果不明显,并且爆震倾向增加明显,这与其点火滞燃期短和设计滚流强度较弱有关.此外,滚流进气道循环变动低、燃烧稳定性好,这种特性使得滚流进气道对废气再循环(EGR)率的耐受度更高,对降低排气温度有利.The intake port was re-designed for a natural gas(NG)engine in order to change the swirl flow into the tumble flow.A performance test was then implemented on the NG engine bench which matched the original and the new intake port respectively.The result shows that,compared with the original intake port under the same operating conditions and control parameters,the new port has lower pre-turbine pressure and temperature,and the brake specific fuel consumption is decreased by 1—2 g/(kW·h).It also has higher cylinder pressure and lower cyclic variation.Both the start of combustion phase angle(AI 05)and the combustion center phase angle(AI 50)are advanced by 2°—3°CA,but the combustion duration is prolonged by 5°—7°CA.Further investigation founds that the reason for the advantage of the new intake port is that the spark plug can be better scavenging.However,the new intake port cannot accelerate combustion and therefore induces a more seriously knocking event,which is ascribed to its shorter ignition delay and weaker designed tumble strength.In addition,the characteristic of better combustion stability makes the new intake port to have higher exhaust gas recirculation(EGR)tolerance,which is beneficial for lower exhaust temperature.

关 键 词：天然气发动机 涡流 滚流 进气道 性能测试 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]