Fig. 15

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Upper/middle figure: evolution of the local tumble ratio TR, at −55 CAD and −30 CAD for cycles 17 and 20, along the TCL identified with its Y coordinate. Lower figure: comparison between the local mean TR around the spark plug (SP) with the global tumble ratio for cycle 17 and 20 along the compression stroke between −95 and −20 CAD. The mean operation is made considering an enclosing volume of ±3 mm in Y direction.

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