2. I.C. ENGINE
FOUR STROKE PETROL & DIESEL ENGINE
TWO STROKE PETROL & DIESEL ENGINE
TURBINE
IMPULSE
REACTION
BOILERS
POWER PRODUCING DEVICES
3. I.C. ENGINE
ī¨ ENGINE
Mechanical device which converts one
form of energy into another form
ī¨ I.C. ENGINE
Engine in which combustion take place
inside engine cylinder is called IC engine.
E.g.-Aircraft engine, Automobile Engines
5. CLASSIFICATION OF I.C. ENGINE
ī¨ 1. CYCLE OF OPERATION
ī¤ Two stroke engine
ī¤ Four stroke engine
ī¨ 2. THERMODYNAMIC CYCLE
ī¤ Otto cycle
ī¤ Diesel cycle
ī¤ Dual cycle
ī¨ 3. METHOD OF IGNITION
ī¤ S.I. ENGINE
ī¤ C,I. ENGINE
ī¨ 4. NO. OF CYLINDERS
ī¤ Single
ī¤ Multi
ī¨ 5. COOLING SYSTEM
ī¤ Air cooled
ī¤ Water cooled
ī¤ Oil cooled
6. CLASSIFICATION OF I.C. ENGINE
ī¨ FUEL USED
ī¤ Petrol
ī¤ Diesel
ī¤ Gas
SPEED
High speed
Lows peed
Medium speed
APPLICATION
Automotive engines
Aircraft engines
Marine application
Generator sets
9. Components of Four-Stroke Engines
Intake Valve
Valve Cover
Intake Port
Head
Coolant
Engine Block
Oil Pan
Oil Sump
Crankshaft
Camshaft
Exhaust Valve
Spark Plug
Exhaust Port
Piston
Connecting Rod
Rod Bearings
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Diagram
11. 11
Intake Stroke
ī¨ Intake valve opens.
ī¨ Piston moves down, ÂŊ
turn of crankshaft.
ī¨ A vacuum is created in
the cylinder.
ī¨ Atmospheric pressure
pushes the air/fuel
mixture into the
cylinder.
12. 12
Compression Stroke
ī¨ Valves close.
ī¨ Piston moves up, ÂŊ
turn of crankshaft.
ī¨ Air/fuel mixture is
compressed.
ī¨ Fuel starts to vaporize
and heat begins to
build.
13. 13
Power Stroke
ī¨ Valves remain closed.
ī¨ Spark plug fires
igniting fuel mixture.
ī¨ Piston moves
down, ÂŊ turn of
crankshaft.
ī¨ Heat is converted to
mechanical energy.
14. 14
Exhaust Stroke
ī¨ Exhaust valve
opens.
ī¨ Piston move
up, crankshaft
makes ÂŊ turn.
ī¨ Exhaust gases are
pushed out
polluting the
atmosphere.
19. PETROL V/S DIESEL ENGINE
ī¨ Otto cycle
ī¨ Air â fuel mixture
suction stroke
ī¨ spark plug is needed
ī¨ C.R.=6-12
ī¨ Low efficiency
ī¨ Light weight
ī¨ Cheap
ī¨ Less vibration & noise
ī¨ Motor cycles, cars, light
duty vehicles
ī¨ Diesel cycle
ī¨ Only air sucked during
suction stroke
ī¨ No spark plug needed
ī¨ C.R.= 14-22
ī¨ High efficiency
ī¨ Heavy
ī¨ Costly
ī¨ More
ī¨ Trucks,buses,gensets
PETROL ENGINE (S.I.) DIESEL ENGINE(C.I.)
20. TWO STROKES V/S FOUR STROKES
ī¨ Cycle - 1 rev & 2 strokes
ī¨ 1 power stroke per Rev.
ī¨ Ports
ī¨ Simple ,light weight , low
cost
ī¨ More power for same
size engine
ī¨ Piston shape âcrown
ī¨ Less efficiency
ī¨ E.g, mopeds, scooters
ī¨ Cycle-2rev & 4strokes
ī¨ 1 Power stroke per 2 Rev
ī¨ valves
ī¨ Complicated, heavy
, costly
ī¨ Less power
ī¨ Flat piston
ī¨ More efficiency
ī¨ Cars, bikes,trucks,buses
TWO STROKES FOUR STROKES
21. What is a Turbine ?
-A Turbine is a device which converts the heat
energy of steam into the kinetic energy & then to
rotational energy.
-The Motive Power in a steam turbine is obtained by
the rate of change in momentum of a high velocity
jet of steam impinging on a curved blade which is
free to rotate.