Classification of Heat Engines

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