Additional Aspects for a Proper Fuel Injection System

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Additional Aspects for a Proper Fuel Injection
System
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The performance of diesel engines is heavily
influenced by their injection system design.
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The main purpose of the system is to deliver fuel
to the cylinders of a diesel engine and it is how
that fuel is delivered that makes the difference
in engine performance.
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Unlike its spark-ignited engine counterpart, the
diesel fuel injection system delivers fuel under
extremely high injection pressures.
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This implies that the system component designs
and materials should be selected to withstand
higher stresses in order to perform for extended
durations that match the engines durability
targets.
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Here are some of the additional aspects are
critical to ensure proper fuel injection system
performance including
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Fuel atomization
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It ensures that fuel atomizes into very small
fuel particles is a primary design objective for
diesel fuel injection systems.
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Small droplets ensure that all the fuel has a
chance to vaporize and participate in the
combustion process.
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Any remaining liquid droplets burn very poorly or
are exhausted out of the engine.
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Bulk mixing
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Ensuring that the evaporated fuel has sufficient
oxygen during the combustion process is also as
important to ensure high combustion efficiency
and optimum engine performance.
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The oxygen is provided by the intake air trapped
in the cylinder.
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A sufficient amount of oxygen must be entrained
into the fuel jet to completely mix with the
available fuel during the injection process to
ensure complete combustion.
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Air utilization
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Effective utilization of the air in the
combustion chamber is closely tied to bulk mixing.
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This can be accomplished through a combination of
fuel penetration into the dense air that is
compressed in the cylinder and dividing the total
injected fuel into a number of jets.
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A sufficient number of jets should be provided to
entrain as much of available air as possible
while avoiding jet overlap and the production of
fuel rich zones that are oxygen deficient.
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Last words
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The main purpose of the fuel injection system is
to deliver fuel into the cylinders of an engine.
In order for the engine to effectively make use
of this fuel
Fuel must be injected at the proper time, that
is, the injection timing must be controlled
The correct amount of fuel must be delivered to
meet power requirement, that is, injection
metering must be controlled.
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However, it is still not enough to deliver an
accurately metered amount of fuel at the proper
time to achieve good combustion.
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