How does CI engine works?

The compression ignition engine operating on liquid fuels, or in the dual-fuel mode, works on the principle of fuel being injected into a charge of compressed air and spontaneously ignited by the high temperature of the induced air by the heat of compression.

How does a CI engine start?

The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to the mechanical compression; thus, the diesel engine is a so-called compression-ignition engine (CI engine).

How does a 4 stroke CI engine work?

On the other hand, a four-stroke compression ignition engine works by inducting air from the intake manifold into the cylinder during the intake stroke, TDC to BDC (see Figure 2), then the intake valves close and the piston then moves back toward TDC while compressing the air to elevated temperature and pressure.

What is delay period in CI engine?

Explanation: Delay period is defined as the time immediately following injection of the fuel during which the ignition process is being initiated and the pressure does not rise beyond the value it would have due to compression of air.

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How ignition takes place in CI?

At this first stage of combustion in the CI engine, the fuel from the injection system sprayed in the combustion chamber in the form of a jet. … This preflame reaction starts slowly and then speeds up until the ignition of the fuel takes place. You can see this process at point C on the diagram.

Is fuel pump used in CI engine?

The injection pump sends fuel under pressure to the nozzle pipes which carry fuel to the injector nozzles located in each cylinder head. Excess fuel goes back to the fuel tank. CI engines are operated unthrottled, with engine speed and power controlled by the amount of fuel injected during each cycle.

What is scavenging air?

Scavenging air in a diesel engine means air used for forcing burnt gases out of the engine’s cylinder during the exhaust period.

How does a 2 cycle diesel work?

A two-stroke diesel engine is an internal combustion engine that uses compression ignition, with a two-stroke combustion cycle. … In compression ignition, air is first compressed and heated; fuel is then injected into the cylinder, causing it to self-ignite.

Why is Morse test conducted?

The purpose of Morse Test is to obtain the approximate Indicated Power of a Multi-cylinder Engine. … When one cylinder is cut off, power developed is reduced and speed of engine falls. Accordingly, the load on the dynamometer is adjusted so as to restore the engine speed.

When knocking in CI engines occur the delay period will be?

From the above explanation, we can conclude that the knocking in CI engines occurs if the delay period of injection is longer than the usual condition.

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What is knocking in IC engine?

knocking, in an internal-combustion engine, sharp sounds caused by premature combustion of part of the compressed air-fuel mixture in the cylinder. In a properly functioning engine, the charge burns with the flame front progressing smoothly from the point of ignition across the combustion chamber.

What is the efficiency of CI engine?

CI engines achieve higher efficiencies than SI engines, peaking around 45% (US DOE, 2010). Load is controlled in a CI engine by the amount of fuel injected limited by the amount of charge gas oxygen.

Which part is not used in CI engine?

In compression ignition (CI) engines, spark plug is not required because the combustion takes places by high compression of air resulting in very high temperature.

What are the 4 phases of combustion?

An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust.