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Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. The combustion may take place in a controlled manner such as in an internal combustion engine or industrial furnace, or may result in an explosion (e.g., a dust explosion). The air–fuel ratio determines whether a mixture is ...
This allows to define a local fuel-air equivalence ratio =,, =,,. The local equivalence ratio is an important quantity for partially premixed combustion. The relation between local equivalence ratio and mixture fraction is given by
AB: Air-Fuel Equivalence Ratio CD: Current 36: 54: 4 Oxygen Sensor 3 AB: Air-Fuel Equivalence Ratio CD: Current 37: 55: 4 Oxygen Sensor 4 AB: Air-Fuel Equivalence Ratio CD: Current 38: 56: 4 Oxygen Sensor 5 AB: Air-Fuel Equivalence Ratio CD: Current 39: 57: 4 Oxygen Sensor 6 AB: Air-Fuel Equivalence Ratio
In combustion physics, fuel mass fraction is the ratio of fuel mass flow to the total mass flow of a fuel mixture. If an air flow is fuel free, the fuel mass fraction is zero; in pure fuel without trapped gases, the ratio is unity. [1] As fuel is burned in a combustion process, the fuel mass fraction is reduced. The definition reads as = where ...
Lean-burn refers to the burning of fuel with an excess of air in an internal combustion engine. In lean-burn engines the air–fuel ratio may be as lean as 65:1 (by mass). The air / fuel ratio needed to stoichiometrically combust gasoline, by contrast, is 14.64:1. The excess of air in a lean-burn engine emits far less hydrocarbons.
A stratified charge can allow for slightly higher compression ratios without "knock," and leaner air/fuel ratio than in conventional internal combustion engines. Conventionally, a four-stroke (petrol or gasoline) Otto cycle engine is fueled by drawing a mixture of air and fuel into the combustion chamber during the intake stroke
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An oxygen sensor (or lambda sensor, where lambda refers to air–fuel equivalence ratio, usually denoted by λ) or probe or sond, is an electronic device that measures the proportion of oxygen (O 2) in the gas or liquid being analyzed.