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 ?
Caption: Figure 12: Temporal variation of ratio of specific heats: (a) lean mixture and (b) rich mixture.
Thus, the late fuel injection forms a stratified mixture in the cylinder, where fuel vapor is carried towards the spark plug location such that a slightly rich mixture exists there; with a very lean mixture at other locations and an over lean mixture in the cylinder [12].
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 0.5% or less.
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.
For lean-burn engines, the venturi and ECV5 are used with a wide-range [O.sub.2] sensor to maintain a constant lean mixture. This mixture can be programmed to change with engine load as the signal requires.