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Large-Eddy Simulation and experimental study of cycle-to-cycle variations of stable and unstable operating points in a spark ignition engine

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Figure

Fig. 2. Evolution of the cylinder pressure of the mean experimental cycle for the two fired operating points
Figure 3 compares the flame speed variations for an isentropic compression of the fresh gases obtained with the reduced  mecha-nisms to references found in the literature [42,43]
Fig. 4 shows the evolution of the phase-averaged mean pressure at probes 1, 2 and 4 of Fig
Figure 6 shows the evolution of the cylinder pressure for experiments and LES for each operating point (only the first 100 experimental cycles are shown for unst_dil for the sake of clarity).
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