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Four stroke 3 RANA SAIFULLAH KHAN
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Four stroke 3 RANA SAIFULLAH KHAN

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Transcript

  • 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. 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. 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. 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. FOUR STROKE ENGINES
  • 6. FOUR STROKE ENGINES
  • 7. FOUR STROKE ENGINES
  • 8. STROKES DEFINED
  • 9. SI ENGINES
  • 10. THEORETICAL OTTO CYCLE
  • 11. Otto cycle
  • 12. PV OTTO CYCLE-COMPARISION
  • 13. DIESEL ENGINES
  • 14. THEORETICAL DIESEL CYCLE
  • 15. IDEAL DIESEL CYCLE
  • 16. IDEAL DIESEL CYCLE
  • 17. PV DIESEL CYCLE-COMPARISION
  • 18. PRESSURE /TEMPERATURE RELATIONSHIP
  • 19. 4 STROKE SI ENGINE
  • 20. 4 STROKE CI ENGINE
  • 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. SI &CI ENGINES -COMPARISION
  • 23. SI &CI ENGINES -COMPARISION