Overpressure calculation model of sphere charge blasting with moving velocity

In order to establish a calculation model for the dynamic blast overpressure field, a correction factor was introduced into the Baker formula, a model for calculating the peak overpressure only in a static blast. The method to obtain the correction factor containing the moving velocity, the azimuth and the scaled distance was established. For getting the function of the correction factor, spherical charge models with the typical moving velocity were established using the shock physical explicit Eulerian dynamic (SPEED) to simulate the dynamic blast process in the air. The peak overpressure in the typical azimuth and scaled distance was obtained. Based on the numerical results, a new calculation model was constructed using the data fitted. The result of the numerical simulation indicates that the corrected formula is a universal calculation model, capable of predicting the peak overpressure in dynamic blast.