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LES study of deflagration to detonation mechanisms in a downsized spark ignition engine

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Figure

Fig. 1. Fresh gases temperature field (a) and estimated temperature fluctuations [22] (b) at an instant close to the autoignition start.
Fig. 3. Maximum intensity of knocking cycles on the spark timing sweep [13].
Figure 5b confirms that the ST at TDC is a transitional point. A higher number of points are close to autoignite, and some of them are in the transition zone between deflagration and detonation
Fig. 6. Burned mass fraction, local in-cylinder pressure and reaction rate evolutions for the LES cycles 6 and 7 at the ST = 8 CAD aTDC.
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