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Effects of large-scale turbulence on cyclic variability in spark-ignition engine

Cyclic variability in engines is well-known, however, its previous studies were undertaken in engines where several conflicting factors act together and their relative influence is still hotly debated. This work systematically isolates individual effects using a new generation of Ported Optical Engines. The work shows the strong correlation between the turbulence field at the moment of spark discharge and later flame propagation. It signifies that turbulence in engines has much longer memory than is currently believed; there is currently a project underway with Mahle Powertrain UK (paul.freeland@gb.mahle.com) as to how to exploit this finding in the applied engine design software.