Question

Which of the following factors affecting combustion in the CI engine?

(a) ignition quantity of fuel

(b) injection pressure of droplet size

(c) injection advance angle

(d) all of the mentioned

I got this question in semester exam.

This interesting question is from Combustion in C.I. Engine in section Combustion and Combustion Chambers of IC Engine

Answer 1

The correct answer is:

(d) all of the mentioned

Explanation: All the listed factors significantly affect combustion in a Compression Ignition (C.I.) engine:

• Ignition quantity of fuel: The amount of fuel injected affects the air-fuel mixture's overall energy, which influences the combustion efficiency and the emission characteristics.
• Injection pressure and droplet size: Higher injection pressure leads to finer fuel atomization, improving air-fuel mixing and promoting more efficient combustion. Droplet size is crucial for how well the fuel mixes with the air, affecting combustion quality.
• Injection advance angle: The timing of fuel injection (advance angle) affects when the fuel begins to combust in relation to piston position. Proper timing ensures optimal combustion and reduces engine knock, enhancing performance and efficiency.

All of these factors interact to control the combustion process, making them all crucial to engine performance and emissions.