点火方式对汽油机燃烧过程的影响

通过基本结构的微小变动,将单火花塞点火(single spark ignition,SSI)改造成双火花塞点火(dual spark ignition,DSI),运用三维仿真软件AVL FIRE模拟仿真,并通过试验验证。再对单火花塞点火、双火花塞同步点火(dual synchronous spark ignition,DSSI)、异步点火(dual asynchronous spark ignition,DASI)3种不同的点火方式进行对比。结果表明:在6500 r/min转速全负荷状态下,空气过量系数为1.00而其他参数调整为最佳时,单火花塞的最佳点火提前角为29°,在空气过量系数为1.15的最佳参数下,双火花塞同步点火的最佳点火提前角为22°,双火花塞异步点火的最佳点火提前角为22°和24°。其中,发动机综合性能在双火花塞异步点火条件下表现最好:相对于单火花塞点火指示功提升8.49%;相对于同步点火,可将最高燃烧压力和压缩负功减小,指示功提升3.60%;同时改善了排放性。上述研究中发动机均控制在未发生爆震情况下。

Influence of Ignition Mode on Combustion Process of a Gasoline Engine

Abstract On the basis of the slight change of its chamber structure, the original single spark ignition(SSI) were transformed into dual spark ignition(DSI), and the three-dimensional simulation software AVL-FIRE were used for simulation, which is verified by experiments. The single spark ignition, dual spark synchronous ignition(DSSI) and dual spark asynchronous ignition (DASI) are compared.Results show that the 6500r/min and full load condition, excess air coefficient is 1,and other parameters are adjusted to the best, the best ignition advance Angle of the single ignition spark plug is 29°, under the optimal parameter of air excess coefficient of 1.15, the best ignition advance Angle of the dual synchronous ignition spark plug is 22°, the best ignition advance Angle of the dual asynchronous ignition spark plug is 22°·24° . among them, the comprehensive performance under the condition of dual asynchronous spark ignition engine performance is best, relative to the single spark ignition, useful power increases by 8.49% ; compared with the dual spark synchronous ignition, maximum explosion pressure and the compression negative work is reduced,useful power was increased by 3.6% . while emissions were improved.In the above study, the engine was controlled without detonation.