Advanced Rapid Combustion Concept Using Autoignition Assisted Flame for High Compression Ratio SI Engines

• Published in: SAE International journal of advances and current practices in mobility Vol. 6; no. 3; p. 1557
• Main Authors: Maruta, Kaoru, Nakamura, Hisashi, Morii, Youhi, Fujikawa, Tatsuya, Seto, Masatoshi, Hori, Junki, Sasaki, Yuta
• Format: Journal Article
• Language: English; Japanese
• Published: Warrendale SAE International, a Pennsylvania Not-for Profit 29.09.2023
• Subjects: Combustion; Compression ratio; Efficiency; Engine tests; Engines; Flames; Gasoline; Geometry; High temperature; Numerical analysis; Propagation; Ratios; Spontaneous combustion; Temperature; Thermodynamic efficiency
• ISSN: 2641-9637; 2641-9645
• DOI: 10.4271/2023-32-0119

To achieve higher thermal efficiency for spark- ignition (SI) engines, advanced rapid combustion technology under high compression ratio is needed. The results of single-cylinder preliminary engine tests using E.U. commercial fuel at 96 RON show that the higher the compression ratio, the faster the combustion speed. Additional engine test and computations using S5R five-component surrogate gasoline with reliable chemistry under various temperature and pressure conditions implied that the autoignition assisted flame played significant role under higher compression ratio conditions, i.e., high temperature and pressure conditions, where apparent increases in laminar flame speeds compared to conventional combustion.