Numerical Simulation And Application Of Shock Wave Propagation Characteristics In Blockhouse Explosion Field

In this paper,numerical simulation and experimental methods are used to study the propagation law of shock wave in the explosion field of the blockhouse and the damage effect of the flow and reflection of the shock wave on the target when it contacts with the target,so as to provide a reference for the damage test of the blockhouse.The main work is as follows:1)In view of the defects of lead shock wave test method,such as long field period,easy to introduce transmission noise,and traditional storage test device,such as poor synchronization,low test efficiency,and both of them can not meet the requirements of multi-point test in confined space,a multi-channel high-speed acquisition and storage device is designed,which has the characteristics of small volume,fast sampling frequency and high precision,It can meet the test requirements of various occasions and improve the test efficiency.2)The numerical simulation model is established for the internal explosion of the bunker.The law of shock wave propagation in the bunker explosion field is analyzed by combining the pressure cloud chart of the explosion field in the bunker and the numerical simulation curve of the test point.The installation error of the sensor in the bunker is simulated by numerical simulation.The influence of the installation error on the shape of the overpressure curve and the peak value of the overpressure is analyzed to provide reference for the test and installation.Combined with the experimental data and numerical simulation results,it is found that there is obvious reflection phenomenon in the explosion field inside the bunker and the overpressure value can not be ignored.However,compared with the explosion field in the fully closed space,the overpressure reflection times of the explosion field in the bunker are limited and the intensity and frequency of the reflection wave at a certain measuring point will change with the change of the position of the detonation center.3)In order to evaluate the damage effect of the overpressure of warhead on the personnel and equipment inside the bunker more accurately,the damage effect of reflection and flow around the shock wave in contact with the target is studied.In this paper,the shock wave damage effect on human brain concussion is taken as an example.The overpressure sensor is installed in the frontal part,left and right skull bone and the back head spoon of the dummy headform,and the multi-channel data acquisition device developed in this paper is installed.The installed dummy model is placed in the open explosion field near the ground,and the free field sensor is set around the head target as the reference for the incident pressure.The numerical simulation model is established for the test field of head target damage,and the pressure flow field and the reflection and flow around the shock wave and the head target are analyzed.The three points of the front,side and back end of the test target are selected,and the numerical simulation overpressure curve is combined with the overpressure peak and the measured data.The characteristics of the overpressure curve and the change of the overpressure peak of each measuring point after the shock wave and the target flow around are analyzed.The importance of model use in the test is verified.