Air-Fuel Mixture

air-fuel mixture

[′er ′fyül ‚miks·chər]
(mechanical engineering)
In a carbureted gasoline engine, the charge of air and fuel that is mixed in the appropriate ratio in the carburetor and subsequently fed into the combustion chamber.

Air-Fuel Mixture

 

the mixture of vaporized fuel and air entering the cylinders of internal combustion engines or formed within them, together with residual gases. The products from the combustion of the air-fuel mixture constitute the working substance for converting the thermal energy of the burned fuel into mechanical work. The basic parameter characterizing the mass composition of the air-fuel mixture is the coefficient of excess air α = L/L0, where L is the actual amount of air in the air-fuel mixture (in kg) and L0 is the amount of air theoretically required for complete combustion of the fuel in the air-fuel mixture (in kg). An air-fuel mixture with α < 1 is called rich, and one with α > 1 is called lean.

References in periodicals archive ?
This allows it to have a better air-fuel mixture, which greatly reduces the formation of soot and nitrogen oxides (pollutants), and increases fuel efficiency by 20 percent.
This combustor is an application of technologies developed for integrated coal gasification combined cycle (IGCC) systems, allowing for low NOx combustion by mixing the fuel gas with an ample volume of air to quickly produce a lean air-fuel mixture.
They achieved engine operation with a lean air-fuel mixture of up to 21:1, but detailed studies were not performed by them.
In short, SKYACTIV engines can compress the air-fuel mixture in the cylinders to an extraordinary degree, thereby obtaining far more energy from every drop of fuel.
The initial temperature, cylinder pressure, and composition of the working fluid (air-fuel mixture) play an important role in determining the combustion characteristics and consequently the emissions from an engine.
The O2 sensor monitors the gases emitted by the vehicle engine thereby maintaining the appropriate air-fuel mixture to facilitate efficient functioning of the engine in accordance to the emission regulatory norms.
At the level D feedback corrects air-fuel mixture composition by analyzing the oxygen content in the purified EG to ensure effective cleaning.
* 'Helical ramp' to induce ultra-high speed vortex of air-fuel mixture in auxiliary combustion chamber
"In addition, fuels with higher ratings are a few percentage points denser, which allows more power per litre in the vehicle," Mathai explained, adding that engine experts are of the view that using a low octane fuel when your car requires a higher version is just as damaging and will lead to an abnormal combustion of the air-fuel mixture in the cylinder.
The aforementioned is because increased compression ratio (CR) increases the tendency for the occurrence of a phenomenon denominated self-ignition, which takes place when at the start of the combustion in the air-fuel mixture happens prior to the spark ignition, which causes quite high pressure peaks and a shock wave within the chamber.