Abstract

A time filtering method was constructed as a means of decomposing the turbulent component that contributes to promoting engine combustion. This time filtering method used the frequency at which the frequency characteristic of the in-cylinder flow changes as the cut-off frequency, and this frequency was confirmed to correspond to the time scale of the relatively large in-cylinder flow induced by the combustion chamber, intake port, and piston shapes. It was also clarified that the cut-off frequency can be uniquely determined by using the inverse of the integral time scale of in-cylinder flow as the cut-off frequency. The time filtering method was applied to a flow field equipped with a tumble control valve, which is an intake switching device. The obtained turbulence was highly correlated with the combustion duration of a metal engine, which confirmed the reliability of the decomposition method. The time filtering method was implemented in commercial analysis software and applied to hybrid engine development. Turbulence was enhanced by the in-cylinder flow enhancement specification that changed the intake port and piston shape from the early development specification and verified the in-cylinder flow enhancement concept for achieving rapid combustion.

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Author (organization or company)

• Yasuhiro OKURA（Honda Motor Co., Ltd.）
• Makoto SEGAWA（Honda Motor Co., Ltd.）
• Hiromi ONIMARU（Innovative Research Excellence, Power unit & Energy）
• Seisuke SATO（Honda Racing Corporation）
• Yasuhiro URATA（Honda Motor Co., Ltd.）

Publication Information

Article of Honda R&D Technical Review Vol.38 (72 - 84)

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