Explosion Features of Liquid Explosive Materials - Liquid Explosives - page 94

Fig. 2.44 The classic shapes
of waves. a Incident wave,
b reflective wave, c wave of
regular reflection d wave of
Mach reflection

It should be pointed out that the critical angle of Mach re fl ection is related with

the intensity of incident waves. It is shown in Fig. 2.43 .
Figure 2.42 gives the re fl ective conditions of aerial explosion on point C, E, F,

etc.

(1) At point C, the incident waves are perpendicular with the ground (Fig. 2.44 a).
The refection at point C is front re

fl ection. The curve shape of re fl ection waves

is curve 2 of Fig. 2.44 b.
(2) At points E and F, the front of incident waves has an angle

u 1 with the ground,

u 1 \ u 1c . The re

and fl ection is oblique re fl ection. Its curve shape is curve 3 of

Fig. 2.44 c.
(3) When

u 1 [ u 1c , Mach re fl ection produces. Its curve shape is curve 4 of

Fig. 2.44 d.

The above three conditions are concluded below.

(1) when u 1 ¼ 0, front re fl ection and regular re fl ection

D P 1
D P 1 þ

6

D P 2 ¼

2

D P 1 þ

7P 0

(2) when 0

\ u 1 \ u 1c , oblique re

fl ection and regular re fl ection