Upload
palmer-mcfarland
View
48
Download
0
Embed Size (px)
DESCRIPTION
Chapter 6 Internal Combustion Engines. I. C. Engines. - PowerPoint PPT Presentation
Citation preview
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Chapter 6
Internal Combustion Engines
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
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.
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
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.
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Basic Structure of I.C. Engines
The components of I.C. Engine
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Stroke Length and Stroke Volume in an IC Engine
Stroke length and stroke volume in I.C. engine
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Four-stroke Spark Ignition Engine
All the four thermodynamic processes in four strokes SI engine
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Four Stroke Compression Ignition Engine
All the thermodynamics processes in four strokes of engines
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Two-stroke Spark Ignition Engine
Working of two stroke S.I. engine
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Two Stroke C.I. Engine
Cut-section of two strokes C.I. engine
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Working of two strokes C.I. engine
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Comparison Between Four Strokes and Two Strokes Engines
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Comparison Between S.I. and C.I. Engines
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Otto Cycle
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Diesel Cycle
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Comparison Between Otto Cycle and Diesel Cycle
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Dual Cycle
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Valve Timing Diagram for Four Strokes S.I. Engines
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Port Timing Diagram for Two Strokes S.I. Engines
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Valve Timing Diagram for Four Strokes C.I. Engine
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
Engine Performance Parameters
• Indicated Thermal Efficiency
• Brake Thermal Efficiency
• Mechanical Efficiency
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
• Volumetric Efficiency
• Relative Efficiency or Efficiency Ratio
• Mean Effective Pressure
Basic Mechanical Engineering, First Editionby Dr Pravin Kumar
Cop
yrig
ht ©
201
3 D
orli
ng K
inde
rsle
y (I
ndia
) P
vt. L
td.
• Mean Piston Speed
• Specific Power Output