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Subject:- internal combustion engine [ ICE].
University: Mumbai University.
File Size:- 2.93.
Format type:- PDF format.
Author: rehan.
Type:- notes.
Heat engine:
Module - I
INTRODUCTION
A heat engine is a device which transforms the chemical energy of a fuel into thermal energyand uses this energy to produce mechanical work. It is classified into two types-
(a) External combustion engine
(b) Internal combustion engine
External combustion engine:
In this engine, the products of combustion of air and fuel transfer heat to a second fluid which
is the working fluid of the cycle. Examples:
*In the steam engine or a steam turbine plant, the heat of combustion is employed to generate
steam which is used in a piston engine (reciprocating type engine) or a turbine (rotary type
engine) for useful work. *In a closed cycle gas turbine, the heat of combustion in an external furnace is transferred to
gas, usually air which the working fluid of the cycle. Internal combustion engine:
In this engine, the combustion of air and fuels take place inside the cylinder and are used as
the direct motive force. It can be classified into the following types:
1. According to the basic engine design- (a) Reciprocating engine (Use of cylinder piston
arrangement), (b) Rotary engine (Use of turbine)
2. According to the type of fuel used- (a) Petrol engine, (b) diesel engine, (c) gas engine
(CNG, LPG), (d) Alcohol engine (ethanol, methanol etc)
3. According to the number of strokes per cycle- (a) Four stroke and (b) Two stroke engine
4. According to the method of igniting the fuel- (a) Spark ignition engine, (b) compression
ignition engine and (c) hot spot ignition engine
5. According to the working cycle- (a) Otto cycle (constant volume cycle) engine, (b) diesel
cycle (constant pressure cycle) engine, (c) dual combustion cycle (semi diesel cycle)
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