Numerical analysis of sunken terrain on the shock wave of solid propellant near ground explosions
In the shock wave overpressure test of solid rocket propellant explosion,the change of terrain after explosion will change the propagation process and pressure distribution of the shock wave,resulting in the experimental result of overpressure less than the theoretical calculation result.In order to study the influence of terrain on shock wave overpressure after explosion,the Autodyn software and Lagrange/Euler coupling method were used to calculate the pressure distribution of explosion shock wave and overpressure curve of shock wave near the ground for 950 kg propellant with a height of 1 m from the ground under planar and sunken terrain conditions.The results indicate that when a sunken terrain is below the propellant,the reflection effect of the terrain causes the hemispherical shock wave pressure formed by the propellant explosion to be higher on the upper side and lower on the near ground side;When a planar terrain is below the propellant,the hemispherical shock wave formed by the propellant explosion is higher on the near ground side and lower on the upper side.When a sunken terrain is below the propellant,the pressure of the shock wave formed by the explosion near the ground is smaller than when the terrain is planar,and the arrival time of the shock wave at the same measurement point is also delayed.When a sunken terrain is below the propellant,the overpressure curve of the explosion shock wave is smaller than the overpressure curve of the flat terrain case.This result explains that the measured data of overpressure in the propellant explosion overpressure test with large explosion pits in engineering experiments is smaller than the theoretical calculation and numerical simulation results.
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