Lambda Factor - tecnotest STARGAS Manuel D'utilisation

STARGAS _________________________________________________________________________ STANDARD TEST
6.3 -

Lambda factor

The Lambda factor λ indicates the stoichiometric ratio, that is the
air/gasoline ration in the combustion chamber.
When this value is close to 1 it means that combustion is perfect inside the
chamber.
The Lambda coefficients are calculated by means of a mathematical
formula according to the selected fuels.
The Lambda coefficient calculating formula is the following one:



×
21 CO



λ
=



+ ×
21 0,5628



Gasoline fed engines =
*Hcv LPG fed engines =
Methane fed engines =
(Lambda Coefficient)
(Lambda Coefficient)
OPERATING INSTRUCTIONS


CO ∗ Hcv

+ + +
O

2 2
2 4


CO



CO

× +
1
2

CO


3,5 +

CO

2
λ
< (lower) than 1.000: rich mixture
λ
> (higher) than 1.000: lean mixture
3,5
× −
0,0087
CO
+
3,5
CO
2
∗ Hcv 0,01754 
− ×

4 2

1,85 CO, CO
2,525 HC = ppm vol.
4





( )

× +
CO CO

2





[
+ + × ×
CO CO HC 6
2
and O = % vol.
2 2
]
10 −
4
33