A Study of an Energy-Enhanced Multi-Spark Ignition System in a Constant-Volume Combustion Chamber 2019-01-0728
Multi-spark ignition is widely used in high-speed internal combustion engines such as racing cars, motorcycles and outboard motors in attempts to overcome the long charging duration. But under lean fuel or strong turbulence conditions, due to the limited spark duration, some applications are too short to provide reliable ignition events. In order to extend the ignitability limit and reduce the combustion variation, an energy enhanced high-frequency multi-spark ignition system is developed in this study. The principle of this ignition system is based on the capacitor discharge, it can generate 5-20kHz high-frequency high-energy ignitions. Firstly, the circuit structure design and control strategy of the proposed ignition system is presented. Secondly, the discharge curve and ignition energy are measured and analyzed. Finally, by means of high-speed photography technology, detailed experiments are investigated by using the direct image and shadowgraph methods simultaneously comparing with traditional multi-spark ignition system in the constant-volume combustion chamber. Results show that the energy-enhanced multi-spark ignition system can increase ignition success probability and extend lean burn limit effectively.
Chang ye, Zhenyi Yang, Shui Yu, Min Xu, Ming Zheng
Shanghai Jiao Tong University, Univ of Windsor