PPT: I.C Engine Mechanical Engineering Notes | EduRev

Thermodynamics

Mechanical Engineering : PPT: I.C Engine Mechanical Engineering Notes | EduRev

 Page 1


?
Introduction 
?
Classification of I.C. engines ,
?
Engine details,
?
I.C.Engine terminology ,
?
Otto four stroke petrol Engine ,
?
Four stroke diesel Engine ,
?
Difference between petrol engine and diesel engine ,
?
Two stroke cycle engines ,
?
Difference between two stroke and four stroke cycle engines ,
?
Indicated Power (I.P.)  , 
?
Efficiencies
   
Page 2


?
Introduction 
?
Classification of I.C. engines ,
?
Engine details,
?
I.C.Engine terminology ,
?
Otto four stroke petrol Engine ,
?
Four stroke diesel Engine ,
?
Difference between petrol engine and diesel engine ,
?
Two stroke cycle engines ,
?
Difference between two stroke and four stroke cycle engines ,
?
Indicated Power (I.P.)  , 
?
Efficiencies
   
?
In 1876 four stroke engine based on Otto cycle was developed by a  German   engineer   
Nikolous  Otto. Diesel Engine was developed by another German engineer Rudolf Diesel in the 
year 1892.
?
Engine refers as “Heat engine is a device which converts chemical energy of fuel into Heat  
energy and this Heat energy further convert into mechanical work”.
?
Based on where the combustion of fuel take place. Whether outside the working cylinder or 
inside the working cylinder
?
(a) External combustion engines (E.C.ENGINES),  (b)  Internal combustion engines 
(I.C.ENGINES)
I.C.ENGINES E.C.ENGINES
Fuel combustion take place inside the cylinder. 
Fuel combustion take place outside the cylinder.
Compact in size and more efficient. Larger in size and less efficient.
Low initial cost. More initial cost.
Working fluid is mixture of air and fuel. Working fluid is steam.
Easier and quick starting of these engines. Starting is difficult and more time is required.
Costly fuels are required like petrol and diesel. Cheaper fuel may be used like coal.
More suitable for mobile applications. Less suitable for mobile applications.
Page 3


?
Introduction 
?
Classification of I.C. engines ,
?
Engine details,
?
I.C.Engine terminology ,
?
Otto four stroke petrol Engine ,
?
Four stroke diesel Engine ,
?
Difference between petrol engine and diesel engine ,
?
Two stroke cycle engines ,
?
Difference between two stroke and four stroke cycle engines ,
?
Indicated Power (I.P.)  , 
?
Efficiencies
   
?
In 1876 four stroke engine based on Otto cycle was developed by a  German   engineer   
Nikolous  Otto. Diesel Engine was developed by another German engineer Rudolf Diesel in the 
year 1892.
?
Engine refers as “Heat engine is a device which converts chemical energy of fuel into Heat  
energy and this Heat energy further convert into mechanical work”.
?
Based on where the combustion of fuel take place. Whether outside the working cylinder or 
inside the working cylinder
?
(a) External combustion engines (E.C.ENGINES),  (b)  Internal combustion engines 
(I.C.ENGINES)
I.C.ENGINES E.C.ENGINES
Fuel combustion take place inside the cylinder. 
Fuel combustion take place outside the cylinder.
Compact in size and more efficient. Larger in size and less efficient.
Low initial cost. More initial cost.
Working fluid is mixture of air and fuel. Working fluid is steam.
Easier and quick starting of these engines. Starting is difficult and more time is required.
Costly fuels are required like petrol and diesel. Cheaper fuel may be used like coal.
More suitable for mobile applications. Less suitable for mobile applications.
?
I.C.ENGINES are may be classified according to
•   Type of fuel used as   (1)Petrol engine  (2)Diesel  engine   (3)Gas engines  (4)Bi-fuel engine (two fuel engine)
•   Nature of thermodynamic cycle as:  (1)Otto cycle engine (2)Diesel engine cycle (3) Duel or mixed cycle engine
•   Number of stroke per cycle as :       (1) Four stroke engine      (2) Two stroke engine
•   Method of ignition as  : (1)  Spark Ignition engines             (Mixture of air and fuel is ignited by electric spark)
                                          (2) Compression Ignition engines (The fuel is ignited as it comes  in contact with hot Compressed air)  
•   Method of Cooling as         :       (1) Air cooled engines     (2) Water cooled engines
•   Speed of  the engines  as   :        (1) Low speed engines  (2) Medium speed engines  (3)  High speed engines 
•   Number of cylinder as        :       (1)  Single cylinder engines    (2)  Multi  cylinder  engines 
•   Position of the cylinder as  :       (1) Inline engines (2) V-engines (3) Radial engines (4) Opposed cylinder engines 
                                                       (4) Opposed piston engines
Inline Engine V- Engine Opposed Piston Engine
Page 4


?
Introduction 
?
Classification of I.C. engines ,
?
Engine details,
?
I.C.Engine terminology ,
?
Otto four stroke petrol Engine ,
?
Four stroke diesel Engine ,
?
Difference between petrol engine and diesel engine ,
?
Two stroke cycle engines ,
?
Difference between two stroke and four stroke cycle engines ,
?
Indicated Power (I.P.)  , 
?
Efficiencies
   
?
In 1876 four stroke engine based on Otto cycle was developed by a  German   engineer   
Nikolous  Otto. Diesel Engine was developed by another German engineer Rudolf Diesel in the 
year 1892.
?
Engine refers as “Heat engine is a device which converts chemical energy of fuel into Heat  
energy and this Heat energy further convert into mechanical work”.
?
Based on where the combustion of fuel take place. Whether outside the working cylinder or 
inside the working cylinder
?
(a) External combustion engines (E.C.ENGINES),  (b)  Internal combustion engines 
(I.C.ENGINES)
I.C.ENGINES E.C.ENGINES
Fuel combustion take place inside the cylinder. 
Fuel combustion take place outside the cylinder.
Compact in size and more efficient. Larger in size and less efficient.
Low initial cost. More initial cost.
Working fluid is mixture of air and fuel. Working fluid is steam.
Easier and quick starting of these engines. Starting is difficult and more time is required.
Costly fuels are required like petrol and diesel. Cheaper fuel may be used like coal.
More suitable for mobile applications. Less suitable for mobile applications.
?
I.C.ENGINES are may be classified according to
•   Type of fuel used as   (1)Petrol engine  (2)Diesel  engine   (3)Gas engines  (4)Bi-fuel engine (two fuel engine)
•   Nature of thermodynamic cycle as:  (1)Otto cycle engine (2)Diesel engine cycle (3) Duel or mixed cycle engine
•   Number of stroke per cycle as :       (1) Four stroke engine      (2) Two stroke engine
•   Method of ignition as  : (1)  Spark Ignition engines             (Mixture of air and fuel is ignited by electric spark)
                                          (2) Compression Ignition engines (The fuel is ignited as it comes  in contact with hot Compressed air)  
•   Method of Cooling as         :       (1) Air cooled engines     (2) Water cooled engines
•   Speed of  the engines  as   :        (1) Low speed engines  (2) Medium speed engines  (3)  High speed engines 
•   Number of cylinder as        :       (1)  Single cylinder engines    (2)  Multi  cylinder  engines 
•   Position of the cylinder as  :       (1) Inline engines (2) V-engines (3) Radial engines (4) Opposed cylinder engines 
                                                       (4) Opposed piston engines
Inline Engine V- Engine Opposed Piston Engine
Page 5


?
Introduction 
?
Classification of I.C. engines ,
?
Engine details,
?
I.C.Engine terminology ,
?
Otto four stroke petrol Engine ,
?
Four stroke diesel Engine ,
?
Difference between petrol engine and diesel engine ,
?
Two stroke cycle engines ,
?
Difference between two stroke and four stroke cycle engines ,
?
Indicated Power (I.P.)  , 
?
Efficiencies
   
?
In 1876 four stroke engine based on Otto cycle was developed by a  German   engineer   
Nikolous  Otto. Diesel Engine was developed by another German engineer Rudolf Diesel in the 
year 1892.
?
Engine refers as “Heat engine is a device which converts chemical energy of fuel into Heat  
energy and this Heat energy further convert into mechanical work”.
?
Based on where the combustion of fuel take place. Whether outside the working cylinder or 
inside the working cylinder
?
(a) External combustion engines (E.C.ENGINES),  (b)  Internal combustion engines 
(I.C.ENGINES)
I.C.ENGINES E.C.ENGINES
Fuel combustion take place inside the cylinder. 
Fuel combustion take place outside the cylinder.
Compact in size and more efficient. Larger in size and less efficient.
Low initial cost. More initial cost.
Working fluid is mixture of air and fuel. Working fluid is steam.
Easier and quick starting of these engines. Starting is difficult and more time is required.
Costly fuels are required like petrol and diesel. Cheaper fuel may be used like coal.
More suitable for mobile applications. Less suitable for mobile applications.
?
I.C.ENGINES are may be classified according to
•   Type of fuel used as   (1)Petrol engine  (2)Diesel  engine   (3)Gas engines  (4)Bi-fuel engine (two fuel engine)
•   Nature of thermodynamic cycle as:  (1)Otto cycle engine (2)Diesel engine cycle (3) Duel or mixed cycle engine
•   Number of stroke per cycle as :       (1) Four stroke engine      (2) Two stroke engine
•   Method of ignition as  : (1)  Spark Ignition engines             (Mixture of air and fuel is ignited by electric spark)
                                          (2) Compression Ignition engines (The fuel is ignited as it comes  in contact with hot Compressed air)  
•   Method of Cooling as         :       (1) Air cooled engines     (2) Water cooled engines
•   Speed of  the engines  as   :        (1) Low speed engines  (2) Medium speed engines  (3)  High speed engines 
•   Number of cylinder as        :       (1)  Single cylinder engines    (2)  Multi  cylinder  engines 
•   Position of the cylinder as  :       (1) Inline engines (2) V-engines (3) Radial engines (4) Opposed cylinder engines 
                                                       (4) Opposed piston engines
Inline Engine V- Engine Opposed Piston Engine
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