Driven by pulsed current, a metal wire explodes due to joule energy deposition. Plasmas generated by explosion diffuse rapidly into ambient gases and is condensated into nanoparticles. Investigation on characteristics of plasmas is important to understand the mechanism of formation of the nanoparticles. In this paper, experiments of microsecond electrical explosion (2~10 cm in length, 0.1~0.4 mm in diameter) in 0.1~1.0 MPa argon gas were carried out with electrical and optical measurements. The influences of experimental parameters, including ambient pressures, wire size, and applied voltage, on the energy deposition were obtained and analyzed. Moreover, using multi-frame photographs and shadowgraphs, the spatial distribution and diffusion characteristics were observed. The energy deposition was found to increase with pressures and applied voltage and to decrease with wire sizes. When the energy deposition was insufficient, the plasma is inhomogeneous along the axial direction and expansion velocity is relative low. Increasein energy deposition will suppress the non-uniformity of spatial distribution and improve the expansion velocities.
KEY WORDS :Electrical explosion of wires;energy deposition;plasma;spatial distribution;diffusion characteristics;
图3
不同放电模式下的典型波形
Fig.3
Typical waveforms in different explosion modes
图4
D=0.1 mm、l=2 cm的铝丝电爆炸在外施电压5~30 kV、气压0.1~1.0 MPa条件下的比沉积能量
Fig.4
Specific energy deposition of exploding wires (D=0.1 mm, l=2 cm) with applied voltage 5~30 kV in 0.1~1.0 MPa argon gas
图5
D=0.2 mm、l=2~8 cm铝丝电爆炸在外施电压20~40 kV、气压0.4 MPa条件下的比沉积能量
Fig.5
Specific energy deposition of exploding wires (D=0.1 mm, l=2~8 cm) with applied voltage 20~40 kV in 0.4 MPa argon gas
图6
D=0.1 mm、l=10 cm铝丝电爆炸不同时刻爆炸图像
Fig.6
Photographs of exploding wires (D=0.1 mm, l=10 cm) at different moments
图11
D=0.4 mm、l=10 cm铝丝在E=9.58 kJ/g时不同时刻的爆炸图像
Fig.11
Photographs of exploding wires (D=0.4 mm, l=10 cm) with specific energy deposition 9.58 kJ/g
图12
D=0.1 mm、l=2 cm铝丝电爆炸在不同沉积能量下的扩散轨迹
Fig.12
Expansion trajectories of exploding wires (D=0.1 mm, l=2 cm) with different specific energy deposition
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