FOUR STROKE ENGINES
strokes(movements of piston from tdc to bdc
or either way)
corresponding rotation of crank how
many du...
EVENTS & SEQUENCE OF OPERATION
DIESEL ENGINE
• INTAKE OF AIR
• COMPRESSION OF AIR
• IGNITION OF FUEL
• IGNITION AND
COMBUS...
ASSUMPTIONS
IDEAL
• FIXED AMOUNT OF MASS
• COMBUSTION PROCESS IS
REPLACED BY HT FROM AN
EXTERNAL SOURCE
• NO INTAKE OR EXH...
FOUR STROKE ENGINES
. BLOW DOWN
OPENING OF EXHAUST VALVE
DURING EXPANSION
. OVERLAP
OPENING AND CLOSING OF VALVE
. RAM EFF...
FOUR STROKE ENGINES
FOUR STROKE ENGINES
FOUR STROKE ENGINES
STROKES DEFINED
SI ENGINES
THEORETICAL OTTO CYCLE
Otto cycle
PV OTTO CYCLE-COMPARISION
DIESEL ENGINES
THEORETICAL DIESEL CYCLE
IDEAL DIESEL CYCLE
IDEAL DIESEL CYCLE
PV DIESEL CYCLE-COMPARISION
PRESSURE /TEMPERATURE
RELATIONSHIP
4 STROKE SI ENGINE
4 STROKE CI ENGINE
CONCLUSIVE COMPARISION
SI ENGINES
• LIGHT WEIGHT
• LOW COST
• SUITABLE FOR SMALL &
MEDIUM SIZED
AUTOMOBILES
• DOMESTIC ELE...
SI &CI ENGINES -COMPARISION
SI &CI ENGINES -COMPARISION
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Four stroke 3 by RANA SAIFULLAH KHAN

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Four stroke 3 by RANA SAIFULLAH KHAN

  1. 1. FOUR STROKE ENGINES strokes(movements of piston from tdc to bdc or either way) corresponding rotation of crank how many during 4 strokes?
  2. 2. 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 AND COMBUSTION OF CHARGE • EXPANSION OF GASES • REMOVAL OF WASTE
  3. 3. ASSUMPTIONS IDEAL • FIXED AMOUNT OF MASS • COMBUSTION PROCESS IS REPLACED BY HT FROM AN EXTERNAL SOURCE • NO INTAKE OR EXHAUST STROKES • ALL PROCESSES ARE INTERNALLY REVERSIBLE-NO FRICTION OR HEAT LOSS • SPECIFIC HEAT ARE ASSUMED CONSTANT AT THEIR AMBIENT TEMPERATURE VALUES REAL/ACTUAL • CHANGE IN COMPOSITION OF THE GASEOUS CONTENTS INSIDE THE CYLINDER DURING COMBUSTION • CALCULATION OF WORK REQUIRED TO CHARGE THE CYCLINDER & PURGE THE GASES • HEAT TRANSFER CALCULATION B/W GASES AND CYLINDER WALLS • FRICTION LOSSES,PRESSURE AND TEMPERATURE GRADIENTS
  4. 4. FOUR STROKE ENGINES . BLOW DOWN OPENING OF EXHAUST VALVE DURING EXPANSION . OVERLAP OPENING AND CLOSING OF VALVE . RAM EFFECT ADDITIONAL MASS OF FRESH CHARGE.
  5. 5. FOUR STROKE ENGINES
  6. 6. FOUR STROKE ENGINES
  7. 7. FOUR STROKE ENGINES
  8. 8. STROKES DEFINED
  9. 9. SI ENGINES
  10. 10. THEORETICAL OTTO CYCLE
  11. 11. Otto cycle
  12. 12. PV OTTO CYCLE-COMPARISION
  13. 13. DIESEL ENGINES
  14. 14. THEORETICAL DIESEL CYCLE
  15. 15. IDEAL DIESEL CYCLE
  16. 16. IDEAL DIESEL CYCLE
  17. 17. PV DIESEL CYCLE-COMPARISION
  18. 18. PRESSURE /TEMPERATURE RELATIONSHIP
  19. 19. 4 STROKE SI ENGINE
  20. 20. 4 STROKE CI ENGINE
  21. 21. CONCLUSIVE COMPARISION SI ENGINES • LIGHT WEIGHT • LOW COST • SUITABLE FOR SMALL & MEDIUM SIZED AUTOMOBILES • DOMESTIC ELECTRIC GENERATORS • SAME COMPRESSION RATIO THERMAL EFFICIENCY MORE CI ENGINES • MEDIUM & LARGE SIZED MOBILES- LOCOMOTIVE/TRUCKS • NOISY • CAN USE LESS REFINED FUELS-DUE HIGHER COMPRESSION RATIO
  22. 22. SI &CI ENGINES -COMPARISION
  23. 23. SI &CI ENGINES -COMPARISION

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