LN07 - Internal Combustion Engines ME422 COMBUSTION in...

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1 Internal Combustion Engines – ME422 COMBUSTION in CI-ENGINES Prof.Dr. Cem Soru ş bay Internal Combustion Engines Combustion in CI Engines ¾ Introduction ¾ Diesel combustion process, combustion chambers, fuel sprays ¾ Phases of diesel combustion ¾ Factors affecting ignition delay
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2 Introduction In diesel engines , only air is send into the combustion chamber during induction. This air is compressed during the compression stroke and towards the end of compression stroke, fuel is injected by the fuel- injection system into the cylinder - just before the desired start of combustion. Liquid fuel is injected at high velocities as one or more jets through small orifices or nozzles in the injector tip. The fuel atomizes into small droplets and penetrates into the combustion chamber - the droplets vaporize and mix with with high-temperature and high- pressure cylinder air. Since the air temperature and pressure are above the fuel’s ignition point, spontaneous ignition of portions of already mixed fuel and air occurs after a delay period of a few crank angle degrees. The cylinder pressure increases as combustion of fuel-air mixture occurs. Diesel Combustion Chambers Direct injection diesel engine (Direkt püskürtmeli diesel) In-Direct injection diesel engine (Bölünmü ş yanma odal ı diesel)
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3 Diesel Combustion Chambers Direct injection diesel engine Diesel Combustion Chambers In-Direct injection diesel engine
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4 Liquid Atomization at High Speeds Diesel Fuel Sprays
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Spray Structure In difusion flames, combustion is controlled by the mixing rate of the fuel and air . The local conditions in the combustion chamber such as the air-fuel ratio, temperature, pressure control the ignition of the fuel and the combustion process. Heat and mass transfer in the combustion chamber and the fluid flow (air flow) also effects this process. Spray structure,
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LN07 - Internal Combustion Engines ME422 COMBUSTION in...

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