Page 22 - 《含能材料》2018年优秀论文

688 FENG Song，RAO Guo‑ning，PENG Jin‑hua

onation velocity D = 8862 m·s ，heat of detonation
-1
Q = 5.23 kJ·g ）booster charges of 0.7 g and elec‑
-1
v
tric detonator（detonator No. 26）were used for firing.
#
Figure 2 shows the explosive charges of sample 4 .

a. sample 2 #

Fig. 1 Schematic diagram of the experimental setup

b. sample 4 #
Fig. 2 Explosive charges of sample 4 # Fig. 3 Pressure histories of shock wave measured by sensor
placed at the distance of 0.7 m from different samples
The pressure histories were captured and record‑
ed by an integral circuit piezoelectric crystal pres‑ 3.2 Bubble Motion
sure transducer（PCB138A05），a sensor signal con‑ Figure 4 shows the bubble generation，expan‑
#
ditioner （PCB482A20）， digital phosphor oscillo‑ sion and contraction of sample 2 . When the bubble
scope（Tektronix DPO7104C）. The images of bub‑ radius reached maximum（t=22.5 ms，R=59.9 cm），
ble pulses were obtained by a high ‑ speed camera the pressure inside the bubble reached minimum.
（Photron APX‑RX）system. The bubble radius reached minimum at t = 46.5 ms.
During the whole moving process of the bubble，the
3 Results and Discussion explosion products escaped from the bubble surface.

3.1 Pressure Histories of Shock Wave and Bubble
Pulses
Figure 3 present pressure histories of shock wave
and bubble pulses measured by sensor placed at the
#
#
distance of 0.7 m from sample 2 and sample 4 ，
respectively. The incident shock wave arrived at
327.6 μs，with a peak of value of 15.49 MPa. For
CL‑20‑based aluminized explosive，the incident shock
wave arrived at 329.7 μs，with a peak of value of Fig. 4 Experimental pictures of bubble pulse for sample 2 #
15.12 MPa. In Fig. 3，it is obvious that the bubble
pulsation periods of two samples are 46.76 ms and Figure 5 shows the bubble generation，expansion
#
50.43 ms. and contraction of sample 4 . The bubble of maxi‑

Chinese Journal of Energetic Materials，Vol.26, No.8 , 2018（686-695） 含能材料 www.energetic-materials.org.cn