Modeling of the spark discharge ignition process in the spark-ignition engine

Research Project

Project/Area Number	15K05832
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Thermal engineering
Research Institution	Okayama University
Principal Investigator	Kawahara Nobuyuki 岡山大学, 自然科学研究科, 准教授 (30314652)
Project Period (FY)	2015-04-01 – 2018-03-31
Project Status	Completed (Fiscal Year 2017)
Budget Amount *help	¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000) Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000) Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000) Fiscal Year 2015: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords	燃焼 / プラズマ / 熱機関 / 分光計測 / 燃焼CFD
Outline of Final Research Achievements	The purpose of this study is to model the spark discharge ignition process in the spark-ignition engine under lean-burn conditions. Spark discharge and initial flame kernel development were visualized. The larger displacement of spark discharge under lean conditions affects the cyclic fluctuation of initial flame kernel. We were able to measure a time series of emission spectra from the spark discharge and initial flame kernel. The plasma temperature of the spark discharge was nearly 6,000 K and that thermal energy was transferred from the spark plasma channel to the combustible mixture. The gas temperature of the initial flame kernel approached that of the adiabatic flame temperature. The modeling of the spark ignition process is examined from a spark discharge to a flame kernel growth. The spark channel behavior is modeled by particles movement. It is possible to estimate the thermal energy transfer from the spark channel behavior to the gaseous mixture.