Internal Combustion Engines

Internal Combustion Engines

Lecture Note-3

I.C Engines and Gas Turbines:-

Introduction: -

An Internal Combustion Engine is a reciprocating heat engine in which fuel mixed with correct amount of air is burnt inside a cylinder.
The gaseous products of combustion form the working substance, which makes the piston move and produce mechanical work at the engine crankshaft.

Applications of I. C Engines:-

1. Road vehicles, locomotives, ships and aircraft.
2. Portable stand by units for power generation in case of scarcity of electric power.
3. Extensively used in farm tractors, lawn movers and motor boats.

Classification of I.C. Engines:-

1.Number of strokes required for completion of one cycle.
Two Stroke & Four Stroke Engines.

2. Thermodynamic Cycle:-
Otto ,Diesel and Mixed Cycle

4. Ignition System:-
Spark and Compression Ignition

5.Kind of fuel used:-
Petrol, Diesel, Gas, By-fuel engines

6.Number and arrangement of cylinders:-
Inline,V-engines,Radial Engines

7.Fuel supply System:-
Carburettor Engines, Airless Injection, Air Injection

8.Cooling System:-
Water cooled or Air cooled

9. Lubricating System
Splash lubrication or Pressure lubrication

10.Governing System:-

11. Valve Location
Overhead or side valve engines

High Speed & Slow Speed Engines.

13.Field of application:-
Stationary Engines & Mobile Engines.

Construction Details

Engine Parts and their functions:-

Cylinder and Cylinder Heads:-

The cylinder is the main body of the engine wherein direct combustion of fuel takes place. The cylinder is a stationary component and piston reciprocates inside it.

Piston and Piston Rings:-

A piston is a metal cup with its crown facing the combustion space. The function of the piston together with the rings, is to carry out the gases in the combustion space and thus transmits the full force of expansion to the...

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