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← ScienceWhich effect reduces combustion completeness in internal combustion engines?
A)Boundary layer quenching✓
B)Excessive compression ratios
C)High engine oil viscosity
D)Inadequate spark plug voltage
💡 Explanation
Boundary layer quenching diminishes combustion as the cold cylinder wall absorbs heat, reducing the flame temperature and slowing radical chain branching locally; consequently, fuel at wall edges is not completely oxidized because kinetic energy is reduced there rather than throughout the bulk.
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