Untitled - Aerobib - Universidad Politécnica de Madrid

6.15. FLAME PROPAGATION IN HYDROGEN-BROMINE MIXTURES 203
1.00
0.75
X 1
X 2
0.50
X 2
(dissociation neglected)
X 3
ε 1f
− ε 1
X 4
0.25
0.0 0.1 0.2 0.3
1 − θ
Figure 6.18: Composition and flux profiles for X 3,0 = 0.65.
Structure of the Flame
The distributions of X 1 , X 2 , X 3 , X 4 and ε 1f − ε 1 corresponding to one of the cases
considered are shown in Fig. 6.18.
In order to show the influence of X 4 on the distribution of X 2 , the figure also
indicates the values for X 2 obtained when X 4 is neglected. Obviously, the influence
of X 4 is very important, especially for values of θ near 1. On the other hand, this is
the most important influence of neglecting X 4 . It may be seen that small deviations of
X 1 and X 3 from the linear law have little influence upon the value of u 0 , since X 1f
and X 3f are different from zero,
References
[1] Mallard, E. and Le Chatelier, H.: Recherches sur la Combustion des Melanges
Gateaux Explosives Ann. Mines, Vol. 8 series 4, 1883, p. 274.
[2] Crussard, L.: Les Deflagrations on Régime Permanent dans les Mileux Conducteurs.
Compt. Rend., Vol. 158, 1914, pp. 125, 340.
[3] Coward H. F. and Payman W.: Chem. Rev., Vol. 21, 1937, p. 359.
[4] Zeldovich, Y. B. and Semenov, N.: Kinetics of Chemical Reactions in Flames.
NACA Tech. Memo. No. 1084, 1946.