Exam Question
Sketch and describe a cylinder liner used for a 2 stroke main engine with cross flow scavenging. Show the provision made for sealing cooling water and exhaust gases. (16)
Class 4 (4th Engineer)
MEKM
📅 Jan 2023
Reference Answer
### 1. Introduction and Function
A cylinder liner in a large, slow-speed 2-stroke marine diesel engine serves as the primary component forming the cylindrical space in which the piston reciprocates. Its principal functions are:
* **Running Surface:** To provide a hard-wearing, compatible, and well-lubricated surface for the piston rings to slide against.
* **Combustion Chamber:** To form the side walls of the combustion chamber, containing extremely high pressures (up to 200 bar) and temperatures (up to 2000°C).
A cylinder liner in a large, slow-speed 2-stroke marine diesel engine serves as the primary component forming the cylindrical space in which the piston reciprocates. Its principal functions are:
* **Running Surface:** To provide a hard-wearing, compatible, and well-lubricated surface for the piston rings to slide against.
* **Combustion Chamber:** To form the side walls of the combustion chamber, containing extremely high pressures (up to 200 bar) and temperatures (up to 2000°C).
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