Engineering · Diesel — Air Systems
The primary purpose of scavenging in a two-stroke diesel engine is to:
- AIncrease the compression ratio
- BSweep exhaust gas out of the cylinder and replace it with fresh air✓ Correct
- CCool the fuel injectors
- DLubricate the piston rings
Explanation
Scavenging forces fresh air through the cylinder to expel combustion gases and supply oxygen for the next charge, since a two-stroke has no separate exhaust stroke.
Authority: Diesel Engines (USCG engineering topic)
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