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Chapter: Mechanical Engineering : Internal Combustion Engines

Classification of Heat Engines

Heat Engine is a machine which converts heat energy supplied to it into mechanical work. Heat energy is supplied to the engine by burning the fuel.

 

INTRODUCTION:

Heat Engine:

 

         Heat Engine is a machine which converts heat energy supplied to it into mechanical work.

         Heat energy is supplied to the engine by burning the fuel.

 

CLASSIFICATION OF HEAT ENGINES:

         Internal Combustion Engines (IC Engines)

 

In IC engines, combustion of fuel takes place inside the engine cylinder.Examples: Diesel Engines, Petrol Engines, Gas engines.

 

         External Combustion Engines (EC Engines)

 

In EC engines, combustion of fuel takes place outside the working cylinder.Examples: Steam Engines and Steam turbines

IC Engines are classified into,

 

(1) Cycle of operation (No of Strokes per cycle)

 

         Two Stroke cycle Engines

 

         Four Stroke Cycle Engines

2) Thermodynamic Cycle or Method of Heat addition:

 

         Otto Cycle Engines (Combustion at constant volume)

 

         Diesel Cycle Engines (Combustion at constant Pressure)

 

         Semi Diesel Engines (Dual Combustion Engines)

(3) Types of Fuel Used :

 

         Petrol Engines

 

         Diesel Engines

 

         Gas Engines

 

(4) Ignition Method :

 

• Spark Ignition (SI)

 

Compression Ignition (CI)

(5) Cooling System:

 

         Air cooled Engines

 

         Water Cooled Engines

(6) Valves Location :

 

         L head (Side valve) engine

 

         T Head (Side valve) engine

 

           I head (over head valve) engine

 

         F head (over head inlet and side exhaust) engine

 

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Mechanical Engineering : Internal Combustion Engines : Classification of Heat Engines |


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