We hope that set of questions on IC engine provided here have helped you in some way. Compression ratio for piston engines, overall pressure ratio for jet engines and gas turbines.Torque curves (for shaft engines) thrust lapse (jet engines).Engine types vary greatly in a number of different ways and following are it’s measures of performance: Biofuels and vegoils: Peanut oil and other vegoils , Biobutano, biodiesel ,Dimethyl Ether, biogas,hydrogenġ0.WHAT ARE THE MEASURES OF IC ENGINE PERFORMANCE?ĪNS.Petroleum: Petroleum spirit ,Petroleum diesel,liquified petroleum gas,Compressed natural gas,Jet fuel ,Residual fuel.Following are the types of fuels used for IC engines: In the context of internal combustion engines, air fuel ratio (AF or AFR) is defined as the ratio between the mass of air m a and mass fuel m f, used by the engine when running: \ = 0.92\]ĭepending on the value of lambda, the engine is told to work with lean, stoichiometric or rich air fuel mixture.ANS. For example, for a gasoline engine, an AFR of 16.5:1 is lean and 13.7:1 is rich. When the air fuel ratio is lower than the stoichiometric ratio, the air fuel mixture is called rich. When the air fuel ratio is higher than the stoichiometric ratio, the air fuel mixture is called lean. For the combustion process to take place in a gasoline engine, the minimum AFR is around 6:1 and the maximum can go up to 20:1. The combustion is possible even is the AFR is different than stoichiometric. This means that, in order to burn completely 1 kg of fuel, we need 14.7 kg of air. For a gasoline (petrol) engine, the stoichiometric air fuel ratio is around 14.7:1. The ideal (theoretical) air fuel ratio, for a complete combustion, is called stoichiometric air fuel ratio. For example, if we have a mixture of methane and air which has the air fuel ratio of 17.5, it means that in the mixture we have 17.5 kg of air and 1 kg of methane. A complete combustion takes place when all the fuel is burned, in the exhaust gas there will be no quantities of unburnt fuel.Īir fuel ratio is defined as the ratio of air and fuel of a mixture prepared for combustion. To guarantee the combustion process, certain quantities of fuel and air need to be supplied in the combustion chamber. Thermal engines use fuel and oxygen (from air) to produce energy through combustion.
Impact of air fuel ratio on engine emissions.
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