Features of passing a shock wave in a long communication passageway with walls of different rigidity

Abstract

The problem of attenuation of a shock wave during its propagation in long communication channels of industrial buildings or mining workings is considered. It is shown that an explosion in a channel produces a head shock wave with a plane wavefront, where the dynamic pressure significantly exceeds the pressure at fronts forming by the incident and reflected shock waves. A physical model of the formation and propagation of a shock wave in a channel with walls of different rigidity is proposed. It is shown that if one of the channel walls is movable or easily deformed, this leads to a violation of geometry of plane wavefront of the head shock wave and its weakening. The necessity of arranging pressure-relief structure in communication channels of buildings with increased explosive hazard and mine workings is grounded.

Selection of Material and Thickness of the Protective Wall in the Conditions of a Hydrogen Explosion of Various Power

“…If we consider the undisturbed state of atmospheric air, the main influence on the characteristics of protective devices is exerted only by the climatic parameters of the environment [19]. However, under conditions of an accidental release and explosion of a gas-air mixture, additional excessive thermal disturbances and loads arise [20,21], and can have a significant effect on the strength properties of the protective devices material resistance [22] to the shock-impulse effect of the blast wave and lead to their premature destruction [23,24]. Thus, a comprehensive analysis of the effectiveness of protective devices should include not only a gas-dynamic calculation of spatio-temporal pressure fields in the accident zone to assess the consequences of an explosion on a human, taking into account the installation of a protective device of a rational design [25], but also the choice of its material, the resistance of which to the bending moment due to the action of explosion pressure forces will not lead to its destruction [26].…”