Abstract
Strong shock waves can be generated by pulse discharge in water, and the characteristics due to the shock wave normal reflection from rigid walls have important significance to many fields, such as industrial production and defense construction. This paper investigates the effects of hydrostatic pressures and perturbation of wave source (i.e., charging voltage) on normal reflection of one-dimensional unsteady flow shock waves. Basic properties of the incidence and reflection waves were analyzed theoretically and experimentally to identify the reflection mechanisms and hence the influencing factors and characteristics. The results indicated that increased perturbation (i.e., charging voltage) leads to increased peak pressure and velocity of the reflected shock wave, whereas increased hydrostatic pressure obviously inhibited superposition of the reflection waves close to the rigid wall. The perturbation of wave source influence on the reflected wave was much lower than that on the incident wave, while the hydrostatic pressure obviously affected both incident and reflection waves. The reflection wave from the rigid wall in water exhibited the characteristics of a weak shock wave, and with increased hydrostatic pressure, these weak shock wave characteristics became more obvious.
Highlights
Shock waves are a common physical phenomenon
High voltage pulse discharge in water is a similar process to an explosion and can generate strong shock waves [3]
Few studies have considered the effect of different hydrostatic pressure on shock wave reflection from a rigid wall
Summary
Shock waves are a common physical phenomenon. They are a very thin fluid flow region where the macroscopic state parameters change dramatically. Research on shock waves mainly focuses on propagation and changes to the medium physical states [1]. High voltage pulse discharge in water is a similar process to an explosion and can generate strong shock waves [3]. Few studies have considered the effect of different hydrostatic pressure on shock wave reflection from a rigid wall. This study investigates normal reflection characteristics of shock waves generated by high voltage pulse discharge in water on the rigid wall under different hydrostatic pressures and charging voltage theoretically and experimentally
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