Characteristics of dynamic explosive shock wave of moving charge

When warheads such as missiles and artillery bombs explode with a certain velocity, such velocity of motion will change the field of blast wave and thus affect the damage power of ammunition. In this paper, numerical simulation of shock wave field of spherical TNT explosion is carried out by using AUTODYN with velocities of 0, 272, 340, 680, 1 020 and 1 700 m/s, respectively. The peak overpressure, specific impulse and positive pressure time of blast wave field are studied quantitatively. The results show that when the azimuth angle is less than 90°, the velocity of the propellant is positively correlated with the shock wave overpressure and specific impulse, and negatively correlated with the positive pressure time; when the azimuth angle is greater than 90°, the velocity of the propellant is negatively correlated with the shock wave overpressure and specific impulse, and positively correlated with the positive pressure time. The peak overpressure presents sinusoidal variation along azimuth. A calculation model of dynamic detonation shock wave overpressure is established by analyzing the peak overpressure data of shock wave. The calculation results of the model are in good agreement with the simulation and experimental results.