Simulation of Explosion Overpressure Distribution for Non-symmetry Cloud Detonation

In order to study the distribution characteristics of overpressure field for non-symmetry detonation, the process of non-symmetry cloud detonation is simulated by LS-DYNA code. The simulated and experimental results are compared. The changing rules of overpressure with distance in three directions, including 0°, 90° and 180°, are obtained. The influences of different angles of inclined cloud on overpressure are studied. Results show that there is an angle between cloud and ground. The track of shock wave presents inclined spheroidicity. The attenuation properties of overpressure in different directions are different. The peak overpressure in the direction of 0° is larger than those in other directions, and the peak overpressure in the direction of 180° is the smallest. The attenuation velocity in the direction of 0° is higher than those in other directions, and the attenuation velocity in the direction of 180° is lower than those in other directions. When the angle of inclined cloud increases from 0° to 8.27°, the peak overpressure is decreased by 7% averagely in the range from 13 m to 30 m in the direction of 0°. The peak overpressure remains nearly unchanged in the direction of 90°, but is increased by 8% averagely in the range from 13 m to 15 m in the direction of 180°. The peak overpressure is decreased by increasing the angle of inclined cloud.