INTERNAL COMBUSTION ENGINES

LECTURER

PROF.Dr. DEMIR BAYKA

ENGINE OPERATING CHARACTERISTICS

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SI ENGINE

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CI ENGINE

CI ENGINE

OPERATING POINT

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IMPORTANT OPERATING VARIABLES

1. SPARK TIMING

IMPORTANT OPERATING VARIABLES

2. MIXTURE COMPOSITION

1. SPARK TIMING

IN SI ENGINES THE HIGHESTCOMBUSTION EFFICIENCY ISACHIEVED WITH VAPORIZED FUEL

HOWEVER THE FUEL IS NEVER FULLYVAPORIZED

THEREFORE LEAN MIXTURES ARE DIFFICULT TO BURN

IDLE OPERATION : REQUIRES RİCH MIXTURE

PART LOAD OPERATION : REQUIRES LEAN MIXTURE

FULL LOAD OPERATION : REQUIRES RICH MIXTURE

LOAD AND SPEED

IMPORTANT DESIGN VARIABLES

1. COMPRESSION RATIO

SURFACE TO VOLUME RATIOINCREASES AS COMP. RATIO INCREASES

MORE HEAT TRANSFER :SLOWER COMBUSTION

2. COMBUSTION CHAMBER DESIGN

MAXIMUM FLAME SPEED IS DESIRED

FASTER BURNING CHAMBER IS THE BEST DESIGN

1) HIGHER FLAME FRONT AREA (GEOMETRY)2) SHORTER FLAME TRAVEL (SPARK PLUG LOCATION)3) MINIMUM MALDISTRIBUTION (FUEL INJECTION TO THE INLET PORT OR INTO THE COMBUSTION CHAMBER)4 ) HIGHER TURBULENCE (SWIRL DURING INDUCTION)

TOYOTA AG4 CHAMBER

TOYOTA20 VALVE4AGE ENGINE

TOFAŞ motorun İki Döngülü Yanma Odası olan silindirler kapağının fotoğrafı

İki Döngülü Yanma Odasında yanma prosesinin anlık fotoğrafları

Homojen yanma

İki aşamada yanma

SUPERHEATED FUEL VAPORIZATION

Plasma reformer

DISPLACEMENTON DEMAND

5.3 LITER ENGINEON SAAB SUV

HONDA VARIABLE CYLINDER MANAGEMENT (VCM)

HONDA HCCITEST ENGINE

HOMOGENEOUSCHARGECOMPRESSIONIGNITION

CI ENGINES

AIR-SWIRLAND

BOWL IN PISTON DESIGN

Bowl and squish chamber Isuzu

Perkins M-system

M-system

CHEVROLET DIESEL COMBUSTION CHAMBER

SUPERCHARGING AND TURBOCHARGING

HYDROGEN FUEL CELL HYBRID BUS