Class 4 (4th Engineer) MEKM 📅 Oct 2022

Exam Question

What pressure-charging system is used on modern slow-speed two-stroke uniflow-scavenged engines, fitted with exhaust valves? Give the crank angles at which the exhaust valves open and close, and the angles at which the scavenge ports open. (16)

Reference Answer

### Pressure Charging System: Constant Pressure Turbocharging
Modern slow-speed, two-stroke, uniflow-scavenged marine diesel engines predominantly utilize the **Constant Pressure Turbocharging** system. This system is designed to maximize the energy extracted from the exhaust gas to drive the turbocharger, thereby improving overall engine efficiency.
**1. Principle of Operation:**
* The fundamental principle is to supply the turbocharger's gas turbine with exhaust gas at a steady and constant pressure.

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