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| Experimental Study on Achieving Rapid Combustion with Multi Spark Ignition |
| DOI： |
| Key Words:hydraulic free piston engine multi point ignition rapid compression and expansion machine rapid and controllable combustion |
| Author Name | Affiliation | | LI Guotian,WANG Yang,XU Shuaiqing,XIAO Huan,TIAN Xianglong,LI Jihui | 1.State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China；
2.Research Institute of Engine Technology, Weichai Power Industy Co., Ltd., Weifang 261000,China |
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| Abstract:On a multi spark ignition experimental platform retrofitted from a rapid compression and expansion machine, the influence of the number of spark plugs on indicated work, maximum combustion pressure, maximum pressure rise rate, heat release rate and knock characteristics was studied. The conclusions are as follows: when hydraulic pressure and mixed gas concentration are kept constant, the indicated work increases at first and then decreases with the advancement of the ignition phase from 5 to 35 mm before TDC. There is an optimum ignition time, and it is delayed accordingly as the number of spark plugs increases. The heat release rate, maximum combustion pressure, pressure rise rate and indicated work with multi spark ignition are significantly higher than those with single spark ignition, and their increase rates are not linear with the number of spark plugs; increased burning rate and indicated work are more obvious in thin mixed gas with more than one spark plug. Multi spark ignition is more inclined to cause knock at the same ignition phase with higher hydraulic pressure. |
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