Etude de la combustion de gaz de synthèse issus d'un processus de ...

Chapter 2
⎡lnSu1
⎤
⎢ ⎥
⎢
lnSu
2 ⎥
b = ⎢.
⎥
⎢ ⎥
⎢.
⎥
⎢lnS
⎥
⎣ un ⎦
(2.92)
And the vector of unknowns X as:
lnS
u0
⎡ ⎤
⎢ ⎥
X = ⎢ α ⎥
⎢
⎣ β ⎥
⎦
This linear equations system is solved applying expression (A-7) of the appendix A.
(2.93)
2.6 Concluding remarks about laminar premixed flames
tel-00623090, version 1 - 13 Sep 2011
The bibliographic revision made herein allows concluding that any experimental or
computed value of laminar burning velocity should be associated with a value of the
flame stretch rate. Ideally, the stretch-free value of the burning velocity should be
quoted and the influence of stretch rate upon this value should be indicated by the
value of the appropriated Markstein length. This is the main reason of the increasing
use of the constant pressure method in which the stretch rate is clearly defined.
The main advantage of the constant volume method for the determination of the
burning velocity is the possibility of exploring a wide range of pressures and
temperatures with one explosion. This is the main reason of its utilization for burning
velocity determination in engine conditions.
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