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Air–fuel ratio is the ratio between the mass of air and the mass of fuel in the fuel–air mix at any given moment. The mass is the mass of all constituents that compose the fuel and air, whether combustible or not.
23 lip 2024 · Keep reading to learn about what is the air-fuel ratio, the AFR of some fuels and how to calculate the stoichiometric air-fuel ratio for fossil fuels.
Air fuel ratio formula. 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: \[\bbox[#FFFF9D]{AFR = \frac{m_a}{m_f}} \tag{1}\] The inverse ratio is called fuel-air ratio (FA or FAR) and it’s calculated as:
Stoichiometric air/fuel ratio (SAFR) or theoretical air/fuel ratio is the amount of air required for complete combustion of fuel which is calculated from the equation of stoichiometry of air/fuel reaction. The equivalence ratio (φ) is widely used to define the air/fuel quality in engines.
Learn what air fuel ratio (AFR) is, how to calculate it, and why it is important for combustion processes. Find out the effects of AFR on efficiency, power, emissions, and fuel types, and see examples of AFR applications in engines, turbines, boilers, and more.
To design efficient combustion systems, it is important to know the amount of air needed to completely burn a specific amount of fuel. This is called the air-to-fuel ratio. To determine it, we begin by including the 3.76 kmols of nitrogen that accompany each kmol of oxygen in the combustion equation.
Fuel-Air Ratio. The reaction for aeroengine fuel at stoichiometric conditions is On a molar basis, the ratio of fuel to air is . To find the ratio on a mass flow basis, which is the way in which the aeroengine industry discusses it, we need to ``weight'' the molar proportions by the molecular weight of the components.
