Environmental Engineering Reference
In-Depth Information
Table 3.6 Influence of charging shell on explosion heat
Explosive
Charging density
ρ
Q v (J/g) (water gas)
Explosion conditions
o (g/cm 3 )
RDX
1.78
5313.68
Inside of 2-mm-thick glass shell
RDX
1.78
5941.28
Inside of 4-mm-thick brass shell
TNT
1.60
3514.56
Inside of 2-mm-thick glass shell
TNT
1.60
4518.72
Inside of 4-mm-thick brass shell
regarded as a certain
fixed value. In the absence of impact of the shell, Q p has a
linear relationship with the charging density
ρ
.
dQ
d
Q v ¼ A þ B q;
B ¼
ð
3
:
14
Þ
q
In RDX,
Q v ¼
1
;
090
þ
180
q
ð
3
:
15
Þ
In TNT,
Q v ¼
550
þ
340
q
ð
3
:
16
Þ
Because there is a part of the energy is released from the secondary reaction
during the expansion of explosion products, the shell thickness has in
uence on the
explosion heat of explosive. Therefore, without any shell or with relatively thin
shell, the expansion of explosion products is not restricted, the pressure drops
rapidly. Thus, balances of the above reactions
fl
trend to move to the left,
and the heat absorption reduces the explosion heat. Additionally, with the rapid
expansion of these gaseous explosion products, some of the unreacted materials are
also scattered leading to energy lose. The shell may hinder the gas product
expansion, reduce the drop rate of pressure, and prolong the secondary reaction
time of charged explosives inside of the shell, resulting in the formation of solid
carbon and the decrease of rightward movement of the secondary reaction of
explosion gas products. The shell also restricts the scattering of unreacted explo-
sive, thus to increase the explosive heat.
(3) In
and
uence of additive
The addition of an inert liquid can play the same role as the increase of explosive
density to increase the explosion heat. The effect of added water on the explosive
properties was shown in Table 3.7 .
Table 3.7 in the dry explosive is pure explosive without added water, and
explosive mixture is a mixture of explosive and water with the percentages listed in
Table 3.7 . It could also be found that the explosion heat with a certain amount of
water added in the explosive was lower than that without added water. For example,
with water of 35.6 % and TNT of 64.6 %, its explosion heat was 2719.60 J/g,
fl
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