深水爆炸二次压力波超压峰值的工程模型

To study the influence of water depth on the propagation of underwater explosion (UNDEX) secondary pressure waves and the quantification of the overpressure peak is significant for engineering applications. A numerical simulation model for the deep-water explosion of a spherical TNT charge was established with AUTODYN, and the results were verified by the UNDEX test conducted in a pressure vessel. The calculation and test results are in good agreement and consistency. On this basis, 18 simulations for different conditions were performed to study the secondary pressure waves generated by the explostion of 30 g spherical TNT charge in the water depth range of 5 to 8 000 m, and 90 data sets were acquired. The analysis showed that: the overpressure peak of the secondary pressure wave of deep water explosion conforms to the Hopkinson law; the overpressure peak increases monotonously and continuously with the increase of water depth, and the increase rate decreases as water depth increases. With further data analysis and processing, an engineering model for calculating the overpressure peak of the secondary pressure wave of deep water explosion based on the Hopkinson law combined with water depth correction is obtained. The model has important engineering practicability and general scalability.