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← TechnologyIn gasoline direct injection, which mechanism causes soot formation associated with wall-wetting?
A)Incomplete combustion proximity to cooler surfaces✓
B)Reduced cylinder pressure due incomplete compression
C)Lean mixture misfire from too little fuel
D)Fuel oxidation before total evaporation
💡 Explanation
Soot forms from incomplete combustion nearest cylinder walls due to quenching. The quenching layer reduces heat, enacting **thermal dissociation**, because fuel molecules don't fully oxidize on cold surfaces, this is soot agglomeration, rather than complete combustion in the center.
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