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What is the air factor lambda?

What is the air factor lambda?

When the combustion is stoichiometric, it can be defined in several ways, usually by the excess air e, or the absence of air (- e), or the richness R, or the inverse, the air factor lambda.

A non-stoichiometric reaction is written as a function of lambda:

CH + lambda (1 + a/4) (O2 + 3.76 N2) -> CO2 + H2O + (lambda - 1) (1 + a/4) O2 + 3.76 lambda (1 + a/4) N2

lambda is the coefficient of the multiplicative term representing the air in this equation(O2 + 3.76 N2).

If e is the excess air, and R the richness, we have:

R = 1/lambda and lambda = 1 + e = 1/R

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