Chapter 6 Internal Combustion Engines

1. Chapter 6Internal Combustion Engines

2. I. C. Engines • “The heat engine in which the combustion takes place inside the cylinder or the product of combustion (flue gas) directly goes to the cylinder and the heat energy of the flue gas is converted into mechanical energy is known as Internal Combustion Engine (IC Engine).” • The combustion may take place either inside or outside the cylinder but heat energy of the combustion is directly utilized by the engine to produce into mechanical power. • In external combustion engines, heat of the combustion is transferred to the intermediate medium like water or air and then the heat energy of that intermediate medium (steam produced from the water or the hot air) is converted into the mechanical energy.

3. Basis for Classification of I.C. Engines • Number of strokes per cycle. • Nature of thermodynamic cycle. • Ignition systems. • Fuel used. • Arrangement of cylinders. • Cooling systems. • Fuel supply systems. • Number of strokes per cycle. • Nature of thermodynamic cycle. • Ignition systems. • Fuel used. • Arrangement of cylinders. • Cooling systems. • Fuel supply systems.

4. Basic Structure of I.C. Engines The components of I.C. Engine

5. Stroke Length and Stroke Volume in an IC Engine Stroke length and stroke volume in I.C. engine

6. Four-stroke Spark Ignition Engine All the four thermodynamic processes in four strokes SI engine

7. Four Stroke Compression Ignition Engine All the thermodynamics processes in four strokes of engines

8. Two-stroke Spark Ignition Engine Working of two stroke S.I. engine

9. Two Stroke C.I. Engine Cut-section of two strokes C.I. engine

10. Working of two strokes C.I. engine

11. Comparison Between Four Strokes and Two Strokes Engines

12. Comparison Between S.I. and C.I. Engines

13. Otto Cycle

14. Diesel Cycle

15. Comparison Between Otto Cycle and Diesel Cycle

16. Dual Cycle

17. Valve Timing Diagram for Four Strokes S.I. Engines

18. Port Timing Diagram for Two Strokes S.I. Engines

19. Valve Timing Diagram for Four Strokes C.I. Engine

20. Engine Performance Parameters • Indicated Thermal Efficiency • Brake Thermal Efficiency • Mechanical Efficiency

21. Volumetric Efficiency • Relative Efficiency or Efficiency Ratio • Mean Effective Pressure

22. Mean Piston Speed • Specific Power Output

23. Thank You.