对置活塞发动机侧置燃烧室性能仿真研究  

Performance Simulation of Opposed-Piston Engine with Double-Sided Combustion Chamber

作　　者：康与宁 李向荣[1] 易光明 杨伟 刘福水[1] KANG Yuning;LI Xiangrong;YI Guangming;YANG Wei;LIU Fushui(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Hebei Huabei Diesel Engine Co.,Ltd.,Shijiazhuang 050081,China;School of Energy and Power Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]河北华北柴油机有限责任公司,石家庄050081 [3]中北大学能源动力工程学院,太原030051

出　　处：《内燃机工程》2021年第1期85-93,共9页Chinese Internal Combustion Engine Engineering

摘　　要：为解决使用中心浅坑燃烧室的对置活塞发动机燃油湿壁、挤流强度低、燃烧室中心混合气过浓等问题,提出对置活塞发动机侧置燃烧室方案,对侧置ω燃烧室和侧置侧卷流燃烧室性能进行研究。使用侧置燃烧室时气口开闭相位的改变会导致发动机指示功率降低,采用GT-Power建立发动机性能仿真模型,通过改变气口参数解决了由于换气过程差异导致的侧置燃烧室性能下降问题。采用AVL FIRE进行三维仿真分析研究不同燃烧室燃烧性能,优化油束夹角后的仿真结果表明侧置侧卷流燃烧室内燃油在分流造型作用下形成卷流运动和干涉壁射流,向油束之间和缸壁附近的空气未利用区域扩散,缓解了燃油在壁面附近的堆积问题,油气混合更加均匀。侧置侧卷流燃烧室方案相比中心浅坑燃烧室方案和侧置ω燃烧室方案燃烧速率更快,指示功率更高,在对置活塞发动机上应用侧置侧卷流燃烧室对提升发动机性能具有重要意义。In order to solve several problems,such as spray wall wetting,low squeeze flow intensity and local over-rich mixture in the central shallow basin type combustion chamber of an opposed-piston engine,a solution using a double-sided combustion chamber was proposed,and accordingly the combustion performance of double-sidedωtype combustion chamber and double-sided lateral swirl combustion chamber was studied.In order to prevent the change of port phase from reducing indicated power when using double-sided combustion chamber,an engine performance simulation model established by GT-Power software was used to solve the performance degradation due to the difference in scavenging process by changing the port parameters.Then,AVL FIRE software was used to perform three-dimensional simulation analysis on the combustion performance of these different combustion chambers.The simulation results after optimizing the spray angle show that the fuel spray in the double-sided lateral swirl combustion chamber forms wall-flow-guided and interferential interaction,and diffuses to the area where the air is not fully utilized,thus preventing the fuel from accumulating on the wall,and making the mixing of fuel and air more uniform.Therefore,compared with central shallow basin type combustion chamber and double-sidedωtype combustion chamber,the double-sided scroll combustion chamber has a faster combustion rate and a higher indicated power.This indicates that the use of double-sided scroll combustion chamber in opposed piston engines is of great significance for improving engine performance.

关 键 词：对置活塞发动机 燃烧室 换气过程 燃烧性能 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]