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FOUR STROKE ENGINES
strokes(movements of piston from tdc to bdcor either
way)corresponding rotation of crank how
many during 4 strokes?
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EVENTS & SEQUENCE OF OPERATION
DIESEL ENGINE INTAKE OF AIR COMPRESSION OF AIR
IGNITION OF FUEL IGNITION AND
COMBUSTION OF CHARGE EXPANSION OF GASES REMOVAL OF WASTE
GASOLINE ENGINE INTAKE OF FUEL AND AIR COMPRESSION OF FUEL
AIR
MIXTURE
IGNITION ANDCOMBUSTION OF CHARGE
EXPANSION OF GASES REMOVAL OF WASTE
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ASSUMPTIONS
IDEAL FIXED AMOUNT OF MASS COMBUSTION PROCESS IS
REPLACED BY HT FROM ANEXTERNAL SOURCE
NO INTAKE OR EXHAUSTSTROKES
ALL PROCESSES AREINTERNALLY REVERSIBLE-NO
FRICTION OR HEAT LOSS SPECIFIC HEAT ARE ASSUMEDCONSTANT AT THEIR
AMBIENTTEMPERATURE VALUES
REAL/ACTUAL CHANGE IN COMPOSITION OF
THE GASEOUS CONTENTS INSIDETHE CYLINDER DURING
COMBUSTION CALCULATION OF WORK
REQUIRED TO CHARGE THECYCLINDER & PURGE THE GASES
HEAT TRANSFER CALCULATIONB/W GASES AND CYLINDERWALLS
FRICTION LOSSES,PRESSURE ANDTEMPERATURE GRADIENTS
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FOUR STROKE ENGINES
. BLOW DOWN OPENING OF EXHAUST VALVE
DURING EXPANSION. OVERLAP
OPENING AND CLOSING OF VALVE. RAM EFFECT
ADDITIONAL MASS OF FRESHCHARGE.
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FOUR STROKE ENGINES
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FOUR STROKE ENGINES
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FOUR STROKE ENGINES
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STROKES DEFINED
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SI ENGINES
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8/2/2019 Four Stroke 3
10/23
THEORETICAL OTTO CYCLE
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Otto cycle
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PV OTTO CYCLE-COMPARISION
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8/2/2019 Four Stroke 3
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DIESEL ENGINES
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8/2/2019 Four Stroke 3
14/23
THEORETICAL DIESEL CYCLE
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8/2/2019 Four Stroke 3
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IDEAL DIESEL CYCLE
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IDEAL DIESEL CYCLE
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PV DIESEL CYCLE-COMPARISION
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8/2/2019 Four Stroke 3
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PRESSURE /TEMPERATURERELATIONSHIP
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4 STROKE SI ENGINE
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8/2/2019 Four Stroke 3
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4 STROKE CI ENGINE
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CONCLUSIVE COMPARISION
SI ENGINES LIGHT WEIGHT LOW COST
SUITABLE FOR SMALL &MEDIUM SIZEDAUTOMOBILES
DOMESTIC ELECTRICGENERATORS
SAME COMPRESSION RATIOTHERMAL EFFICIENCYMORE
CI ENGINES MEDIUM & LARGE SIZED
MOBILES-
LOCOMOTIVE/TRUCKS NOISY CAN USE LESS REFINED
FUELS-DUE HIGHER
COMPRESSION RATIO
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SI &CI ENGINES -COMPARISION
