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The stoichiometric mixture for a gasoline engine is the ideal ratio of air to fuel that burns all fuel with no excess air. For gasoline fuel, the stoichiometric air–fuel mixture is about 14.7:1 [1] i.e. for every one gram of fuel, 14.7 grams of air are required. For pure octane fuel, the oxidation reaction is:
12 cze 2019 · Some of the important properties of fuels such as the closed formulas, molar weight, lower heating value and higher heating value, stoichiometric air/fuel and fuel/air ratios, evaporation temperature, motor octane number (MON), research octane number (RON), and cetane number are given.
Selected requirements and fuel properties are shown in Tables 1 and 2 below. Table 1. Selected requirements for gasoline properties in Europe and in the U.S., together with automanufacturer's recommendations (WWFC).
A gasoline engine burns a mix of gasoline and air, consisting of a range of about twelve to eighteen parts (by weight) of air to one part of fuel (by weight). A mixture with a 14.7:1 air/fuel ratio is stoichiometric, that is when burned, 100% of the fuel and the oxygen are consumed.
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: \[\bbox[#FFFF9D]{AFR = \frac{m_a}{m_f}} \tag{1}\]
Operating values and as a cycle average statistic. BSFC [g/ (kW⋅h)] map. Any engine will have different BSFC values at different speeds and loads. For example, a reciprocating engine achieves maximum efficiency when the intake air is unthrottled and the engine is running near its peak torque.
Gasoline, which is derived from refining crude oil, contains much more energy than coal (twice the lower grade bituminous) or wood (three times). Liquid natural gas (LNG) is almost entirely composed of methane, while natural gas has about 85% of its mass accounted for by methane. Jet A-1 is the standard fuel used by commercial jet planes.
