Class 2 (2nd Engineer) MEKM 📅 Aug 2023

Exam Question

How is fuel oil injected into the cylinder of a heavy-oil two-stroke cycle internal combustion engine and how is it ignited? Show by a timing diagram at what point of the stroke injection of the fuel begins and ends. Name the engine to which your answer refers. Explain the effect of advancing the timing of injection on (16)

(a) Fuel per brake horsepower hour

(b) Exhaust temperature

Reference Answer

Fuel injection and ignition in the cylinder:
The fuel is delivered by the fuel pump to the fuel injectors or fuel valves.
For the fuel to burn completely, at injection time, it is broken up into tiny droplets in a process called atomisation.
These tiny droplets penetrate far enough into the combustion space so that they mix with the compressed air inside the cylinder.

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