A Study on Accomplishing Lean Combustion by Multistage Pulse Discharge Ignition Using an Optically Accessible Engine
Published October 30, 2018 by SAE International in United States
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Lean burn technology has a problem of greater combustion fluctuation due to unstable initial flame formation and slow combustion. It is generally known that generating a flow field in the cylinder is effective for reducing combustion fluctuation and shortening the combustion period. In this study, we investigated the influence of the discharge condition and in-cylinder swirl flow on initial flame formation and ignition performance between conventional spark ignition (SI) and multistage pulse discharge (MSPD) ignition. Visualized photographs were obtained near the spark plug with a high-speed camera in an optically accessible engine. In-cylinder pressure analysis was also performed in order to explicate the combustion phenomena. The results revealed that ignition performance of both SI and MSPD was improved under a swirl flow condition in the cylinder and that combustion fluctuation was effectively reduced. Under the generation of in-cylinder swirl flow, the effect on reducing combustion fluctuation was greater with MSPD than with SI, and more stable combustion was obtained.
CitationAbe, Y., Iimura, M., Furusho, T., Takeda, K. et al., "A Study on Accomplishing Lean Combustion by Multistage Pulse Discharge Ignition Using an Optically Accessible Engine," SAE Technical Paper 2018-32-0007, 2018, https://doi.org/10.4271/2018-32-0007.
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