Environmental Engineering Reference
In-Depth Information
Table 7.9 Thermobaric explosive composed of nitromethane and aluminum flakes
Formulation composition and content (%)
Properties
Nitromethane
RDX Aluminum
flakes
Ethyl
ether
Viscosity
Density Detonation
velocity
Detonation
temperature
Detonation
pressure
40
30
20
10
160
-
200
(paint
viscosity
flow cup-
4)
1.61
-
1.65
5,800
-
6,200 m/s
The detonation experiments of nitromethane/aluminum explosive were con-
ducted under equivalent concentration ratio conditions with an ignition delay of
380 m/s. Total 15 explosion pressure sensors were placed at different points of the
leveled combustion area, and their distance from the explosion end is 2.45, 3.85,
5.25, 6.65, 8.05, 9.45, 10.85, 12.25, 13.65, 17.15, 19.25, 21.35, 23.45, 25.55, and
27.65 m, respectively. The transient pressure during the detonation transition pro-
cess has been determined, and the results were summarized in Table
7.10
.
Table
7.10
revealed the pressure and explosion characteristics produced in the
transition process from combustion to detonation of the three-phase suspension
clouds of nitromethane/aluminum/air. Based on these results, he went ahead to
study general rules involved in the explosion of the mixture of nitromethane and
ethylene oxide [
38
,
39
].
When propylene oxide clouds are ignited by spark, the cloud particles sur-
rounding the spark are in their high temperature states, thus the surface of particles
might peel, crush, and atomize, followed by evaporation and diffusion. This type of
explosive seems to combust in the form of gas-phase reaction, thus the ignition
process is transmitted automatically. At the beginning, combustion proceeds in a
Table 7.10 Detonation
combustion results collected
from the mixture of
nitromethane and aluminum
powder
No.
x/m
p/MPa
t/ms
D
v
/(km/s)
1
2.45
0.09
74.11
0.14
2
3.85
0.17
84.32
0.46
3
5.25
0.35
87.36
0.99
4
6.65
0.85
88.77
1.08
5
8.05
1.32
90.07
1.35
6
9.45
1.65
91.10
2.13
7
10.85
1.12
91.76
1.77
8
12.25
1.76
92.55
1.62
9
13.65
2.93
93.42
1.67
10
17.15
3.02
95.51
1.34
11
19.25
3.43
97.08
1.94
12
21.35
3.85
98.16
1.59
13
23.45
3.14
99.48
1.65
14
25.55
2.98
100.75
1.80
15
27.65
2.83
101.92
