Environmental Engineering Reference
In-Depth Information
Fig. 2.8 The relative
positions of balanced
detonation adiabatic line H,
moment adiabatic line k
0
, and
detonation adiabatic line k
1
with maximum exothermic
energy
like the early stage of hot spot initiation of detonation to homogeneous detonation.
The pressure distribution of two-stage detonation is the dashed curve in Fig.
2.9
.If
all reactions from early to
final stages are faster reaction, the pressure distribution is
the solid curve of Fig.
2.9
.
Bdzil and Davis [
8
]
first put forward two-stage theory, which has attracted the
attention of detonation. The
first fast stage releases most of exothermic detonation
energy. In the second relatively slow stage, the energy released is only the remnants
(e.g., 4 %). According to the above theory, if the assumption is based on the
reaction rates and the calculated CJ pressure of Comp B explosives PH = 26.4 GPa,
and 96 % of chemical energy released in the
rst stage, the theory data match the
experiment ones.
This study will discuss the two-stage detonation theory. The
first stage is the
rapid/fast reaction stage, which releases almost all energy; while the reactions of the
second stage are slow, and there are possible endothermic reactions. The stable/
steady under-pressure detonations would be proved.
After the detonation of liquid explosives, the detonation rate is determined by the
inclination/dip angle of Rayleigh line, which is tangential to the detonation adia-
batic curve with the most heat released. The detonation pressure is determined by
