Exam Question
With respect to a turbo-charging a 2-stroke main propulsion diesel engine:
(a) What is the purpose of auxiliary blower?
(b) What are the safeties provided for the scavenge air receiver?
(c) Why do we require scavenge air cooler?
Class 2 (2nd Engineer)
MEKM
📅 Dec 2025
Reference Answer
(a) Purpose of Auxiliary Blower
In a 2-stroke turbocharged marine diesel engine, the auxiliary blower is essential for supplying scavenge air when the turbocharger cannot produce sufficient air pressure. Its functions include:
Low-Load Operation: At low engine speeds (e.g., maneuvering), exhaust gas energy is insufficient to drive the turbocharger efficiently. The auxiliary blower provides the required scavenge air pressure for proper scavenging and combustion.
Engine Starting: Before starting, it supplies fresh air to purge exhaust gases from the cylinders, ensuring clean and smooth ignition when fuel is introduced.
In a 2-stroke turbocharged marine diesel engine, the auxiliary blower is essential for supplying scavenge air when the turbocharger cannot produce sufficient air pressure. Its functions include:
Low-Load Operation: At low engine speeds (e.g., maneuvering), exhaust gas energy is insufficient to drive the turbocharger efficiently. The auxiliary blower provides the required scavenge air pressure for proper scavenging and combustion.
Engine Starting: Before starting, it supplies fresh air to purge exhaust gases from the cylinders, ensuring clean and smooth ignition when fuel is introduced.
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