Research On The Distribution Law Of Shock Wave Pressure Under Typical Diffraction Condition

Under actual combat conditions,the high-energy warhead explosion is faced with complex and non-ideal environments such as trees,mounds and pits,which has a great influence on the shock wave propagation of high-energy warhead explosion,and there is a big difference between the shock wave pressure distribution under traditional ideal conditions.At present,it is still unable to accurately evaluate the explosive damage power of the warhead under actual combat conditions.In this paper,the distribution of shock wave pressure under typical diffraction conditions such as cylindrical obstacles and pits is studied,which has important theoretical and military application value for warhead damage power evaluation,test and battlefield personnel safety protection in actual combat scenarios.The finite element simulation model was established by AUTODUN,and the shock wave pressure distribution under the conditions of cylindrical obstacles with different detonation center distances,diameters and heights was numerically simulated.The influence of the detonation center distance,height and diameter of the cylindrical obstacle on the shock wave pressure behind the obstacle was confirmed,and the influence range of the cylindrical obstacle was obtained.Based on this,the suggestions for the installation of the fragment retaining rod were given.The shock wave pressure inside and on the wall of transverse and longitudinal pits was numerically simulated and tested,and the overpressure peak changes in the same position of the pits and surface were compared.The overpressure peak differences inside and at the edge of pits were compared,and the variation law of overpressure peak in the horizontal and vertical directions was obtained.Finally,suggestions for personnel protection in the pits were put forward.The shock wave pressure at the bottom and rear of a small rectangular pit is numerically simulated and tested.It is found that the peak value of shock wave overpressure at the bottom of the pit presents a ’spoon’ distribution of left lower and right high.According to the change of overpressure behind the pit,it is divided into strong influence area and weak influence area.Based on dimensional analysis,the engineering calculation formula of the shock wave overpressure peak at 0.2 m ～ 2.0 m behind the pit is given.By studying the distribution law of shock wave pressure under typical diffraction conditions such as cylindrical obstacles and pits,it provides a reference for further studying the spatial and temporal distribution law of shock wave in the complex combat environment.