The influence of the hydrostatic pressure on the parameters of a pressure wave generated by an electric discharge in a fluid

Abstract

This study reveals the results of the experimental investigation into the influence of the hydrostatic pressure on the parameters of a pressure wave during an electric discharge in a fluid. It is shown that an increase in the hydrostatic pressure provokes a decrease in the amplitude of the pressure wave and a change in its time profile.

Study of the fracturing behaviour of an electrohydraulic shock wave in sandstone under static pressure

“…Based on measured EHS in the literature [20] (supersonic breakdown mode, discharge gap 25 mm, needle-needle electrode), the value of h is calculated to be about 1200, and equation ( 6) can be obtained. The reference value of θ is taken as 0.5 [20] Based on equation ( 6), when the discharge energy E B is 5, 10 and 15 kJ, the peak value of the incident shock wave at R = 50 mm is 53.7, 75.9 and 93.0 MPa, respectively Based on the literature [10,11], the hydrostatic pressure has little effect on the peak value of an EHS in supersonic breakdown mode. This paper assumes that the amplitude and the pre-peak and post-peak waveforms of EHS under different static pressures are consistent.…”

“…In this paper, the value of the reference coefficient β/α is 10 [20]. The literature [23] gives the method for estimating t r (µs) of the EHS in a single medium, shown in equation (11), where d (m) is the diameter of the spherical shock wave, C r (m s −1 ) is the velocity of sound in water, ρ 0 (kg m −3 ) is the density of water, ρ x (kg m −3 ) is the density of water at the shock wave front, P x (MPa) is the peak value at the shock wave front and P 0 (MPa) is standard atmosphere pressure…”

“…The increase in the impact on the peak of the shock wave is small. Smirnov et al [11] studied the law of change of shock parameters under different static pressures (0.1-30 MPa). Their research shows that an increase in static pressure will lead to changes in the shock wave waveform and shock wave peak value.…”

Experimental Study on Pressure Wave Characteristics of High-Voltage Discharge in Water With Hemispherical Electrodes

“…It can be seen that the shock wave pressure under a particular discharge voltage varies with the discharge electrode spacing. When electrical energy is applied to the discharge electrodes, the energy deposited between discharge electrodes will break through the electrode spacing before forming a plasma shock wave [35]. Pulse energy between the electrode spacing is important [33], which determines the peak pressure of the shock wave.…”