lean mixture

lean mixture

[′lēn ¦miks·chər]
(mechanical engineering)
A fuel-air mixture containing a low percentage of fuel and a high percentage of air, as compared with a normal or rich mixture. Also known as lean fuel mixture.

lean mix, lean mixture

1. A concrete or mortar mixture with relatively low cement content.
2. A plaster which is not workable.

lean mixture

A fuel-air mixture where the fuel-air ratio is less than 1:15. See air-fuel mixture ratio.
References in periodicals archive ?
One way to solve this problem is to use pre-chamber generated hot jet to ignite the lean mixture, rather than using a conventional spark plug [5, 6].
Possible emission reduction concepts are lean mixture combustion with oxidation catalyst and SCR, lambda 1 process with 3-way catalyst.
The fuel advancing helps in the high load conditions to release low HC for 40% SFME same time the release of HC is more for both 20% SFME and 40% SFME in injection advancing and it may be due to the lean mixture of fuel.
As for the rationalization for why the ACIS is called for, he explains, "As you add more exhaust gas and lean mixture out, the mixture is more difficult to ignite, and it burns really slow.
The lean mixture also provides a more complete combustion process resulting in reduced CO and hydrocarbon levels in the exhaust.
Towards lean mixture CO levels are approximately constant at a low level of about 0.
Because fuel additive improves the reaction of fuel lean mixture with surrounding oxygen, gas temperature slightly increases and, consequently, more unburned fuel vapours as airborne aerosols appear in the exhausts.
The system varies the fuel intake according to the driving conditions - at low speeds it runs on a very lean mixture of fuel and air, decreasing consumption, but, for more active driving, the engine automatically switches to a high-power mode.
The system varies the fuel intake according to the driving conditions -at low speeds it runs on a very lean mixture of fuel and air,decreasing consumption,but,for more active driving, the engine automatically switches to a high power mode.
In particular, the engine can operate with a very lean mixture in the combustion chamber ignited by a stable and rich mixture in the sub-volume (more radicals in the jet ignitions).