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A SEMINAR REPORT ON DIESEL ENGINE MODERATOR:
PROF. P. SHRIVASTAVA
ER. V. S. CHANDEL
MECHANICAL DEPARTMENT PRESENTED BY:
RENUKA RANI PATEL
BRANCH-MECH. VI SEM.
0301ME081026 |
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CONTENTS:- Introduction
Diagram of diesel engine
Working diagram
Working of diesel engine
Indicator diagram
Valve timing diagram
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INTRODUCTION A diesel engine (also known as a compression-ignition engine and sometimes capitalized as Diesel engine) is an internal combustion engine that uses the heat of compression to initiate ignition to burn the fuel, which is injected into the combustion chamber during the final stage of compression.
This is in contrast to spark-ignition engines such as a petrol engine (gasoline engine) or gas engine (using a gaseous fuel as opposed to gasoline), which uses a spark plug to ignite an air-fuel mixture. The diesel engine is modeled on the Diesel cycle.
The engine and thermodynamic cycle were both developed by Rudolf Diesel in 1897. The diesel engine has the highest thermal efficiency of any regular internal or external combustion engine due to its very high compression ratio. Low-speed diesel engines (as used in ships and other applications where overall engine weight is relatively unimportant) often have a thermal efficiency which exceeds 50 percent. |
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DIAGRAM OF DIESEL ENGINE Rocker arm Valve spring Valve guide Pushrod fuel injector Combustion chamber Cam Camshaft Water jacket Connecting rod bearing |
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WORKING OF DIESEL ENGINE |
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Working diagram |
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WORKING(showing process) . |
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WORKING OF DIESEL ENGINE DIESEL ENGINE COMPRISES FOUR STROKES AS:-
Intake stroke
Compression stroke
Power stroke
Exhaust stroke
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INTAKE STOKE The piston is at top dead center
at the beginning of the intake stroke,
and, as the piston
moves downward,
the intake
valve opens.
The
downward movement
of the piston draws air
into the cylinder,
and, as the piston reaches
bottom dead
center, the intake valve closes. . |
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COMPRESSION STROKE The piston is at bottom
dead center at the beginning
of the compression stroke,
and, as the piston moves
upward, the air compresses.
As the piston reaches top
dead center, the
compression stroke ends |
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POWER STROKE The piston begins the power
stroke at top dead center.
At this point, fuel is injected
into the combustion chamber and is
ignited by the heat of the compression.
This begins the power stroke.
The expanding force of the
burning gases pushes the piston downward, providing power to the crankshaft.
The diesel fuel
will continue to bum through the entire power stroke (a more complete burning of the fuel). |
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EXHAUST STROKE As the piston reaches bottom dead center on the power stroke, the power stroke ends and the exhaust stroke begins.
The exhaust valve opens, and, as the piston rises towards top dead center,
the burnt gases are pushed out through the exhaust port.
As the piston reaches top dead center, the exhaust valve closes and the intake valve opens. The engine is now ready to begin another operating cycle.
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INDICATOR DIAGRAM OF DIESEL ENGINE |
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Valve timing diagram |
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