Influence Of Ignition Model On Combustion Process Of A Gasoline Engine

At present,with the increasingly prominent energy and environmental problems,people are in the pursuit of good engine performance,the demand for engine economy and emission performance is also increasing.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 for the accuracy of the simulation model.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°CA,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°CA,the best ignition advance Angle of the dual asynchronous ignition spark plug is 22 ° CA · 24 ° CA.among them,the comprehensive performance under the condition of dual asynchronous spark ignition engine performance is best,relative to the single spark ignition,indicated work increases by 8.49%;compared with the dual spark synchronous ignition,maximum explosion pressure and the compression negative work is reduced,indicated work was increased by 3.60%.while emissions were improved.In the above study,the engine was controlled without detonation.