Internal Combustion Engines
4InternalCombustionEnginesInternalcombus tionenginesaredevicesthatgenerateworkusi ngtheproductsofcom-bustionastheworkingfl uidratherthanasa ,thecombustionis carriedoutina mannerthatproduceshigh-pressurecombustio nprod-uctsthatcanbeexpandedthrougha introducesa :(1)thesparkignitionengine,whichisusedpr imarilyinautomobiles;(2)thedieselengine, whichisusedinlargevehiclesandindustrials ystemswheretheimprovementsincycleefficie ncymakeitadvantageousoverthemorecompacta ndlighter-weightsparkignitionengine;and( 3)thegasturbine, ,unburnedhydrocarbons, , , ,car-bonmonoxide, , pistonmovesupanddownina cylinder,transmittingitsmotionthrougha (topdeadcenter)B=crankanglePistonPistonr odCrankB=180 (bottomdeadcenter) ; ; ;stroke4, ,thesparkplugisfired, burningmixtureexpands, , ,highpowerisneededanda , , , 'I-,~0' ~ (f) "brakespecificfuelconsumption.
The spark ignition engine is one of the few combustion systems that burns pre mixed fuel and air. Fuel is atomized into the air as it flows through a carburetor and vaporizes before it enters the cylinder. Even though the fuel and air are premixed prior to combustion, the gas in the cylinder becomes segmented into burned and unburned
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