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5 20
1. PV diagram TS diagram (20 ). Carnot Power Cycle. Otto Cycle.
Diesel Cycle
T
Th
Tc
Carnot Power Cycle
2 3
4
S
1
P
1,5
Diesel Cycle
6
2 3
4
V
1,5
Otto Cycle
6
2
3
4
P
V
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compression process 1-2
combusion process 2-3
a)constant volume (otto cycle)
b)constant pressure(diesel cycle)
expansion process 3-4
Cooling process 4-1
exhaust process 5-6
intake process 6-1
2. 4 (20 )
DC power supply 12 V ,high voltage coil 15 kV, Cambreaker
,distributer rotor spark plugs Cambreaker
coil TDC (advance ignition timing) coil distributer rotor spark
plugs spark Firing order 1-3-4-2
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3. (20 )
1. Turbo Charger
2. Carburator
Turbocharger compressor turbine Turbine compressor
Carburator
-(F/A ratio). 3 (Nozzle) Venturi
1.Inlet section
2.Venturi throat
3.Float chamber
4.Pressure equalizing passage
5.calibrated nozzle
6.Fuel discharge tube
7.Throttle plate
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4. 4 6 1200 rpm
150 . 200 .. . F/A ratio 1.0
isfc-Indicated specific fuel consumption
f
-fuel conversion efficiency
imep-indicated mean effective pressure
(20 )
imep F/A F/A = 1.1 f F/A F/A =0.75 isfc F/A F/A =0.75 F/A = 1.0
imep = 960 kPaPower = PLANn
= 960x20x(/4)x152x(1200/2/60)x6/1000000
=202 kw
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5. stoichiometric A/F Octane,C8H18 (O2:N2
=1 :3.773 by mole ) molecular weights of O2 =32,N2 =28.16,atomic
weights C= 12.011 and
H = 1.008 (20 )
Octane C8H18 + 12.5(O2+3.773N2) = 8CO2 + 9H2O + 47.16 N2
By mole :1 + 12.5(1+3.773) = 8+9+47.16
1+ 59.66 = 64.16
By mass: 114.15 + 59.66x28.96 = 8x44.01 + 9x18.02 +
47.16x28.16
1 + 15.14 = 16.14
stoichiometric A/F = 15.14
