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Which process reduces thermal efficiency in a gasoline engine during rapid acceleration?

A)Increased exhaust gas recirculation fraction
B)Wall quenching of the flame front
C)Enhanced in-cylinder turbulence
D)Premature detonation from fuel auto-ignition

💡 Explanation

During rapid acceleration, the increased fuel injection causes incomplete combustion and the flame front cools near cylinder walls due to heat transfer according to wall quenching effect, thus reducing power stroke work and lowering thermal efficiency. Therefore wall quenching dominates, rather than recirculation, turbulence, or detonation, whose impact depends on combustion optimization.

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