Abstract
The knocking phenomenon at the time of auto-ignition can be examined in detail using the pressure transport equation. In particular, it has been clarified that the expansion effect suppresses the pressure increasing. In this study, effective applications of the expansion effect based on the acoustic energy equation derived from transport equations is discussed. And the knock suppression theory is verified using numerical simulations and the results show that knock intensity can be reduced. Finally, it is shown that the knock intensity has a similarity rule to acoustic Damkohler Number.
