Research on the propagation pattern of shock waves superimposed by explosion of LNG storage tanks

In order to study the superposition effect of physical explosion and chemical explosion shock wave of liquefied natural gas storage tank and obtain the distribution law of load and overpressure, this paper uses ANSYS/LSDYNA to establish the finite element model and conduct numerical simulation calculation. The results show that the overpressure decreases with the increase of the circumferential angle in the shock wave superimposed region. As the surface of the storage tank increases in the addition of shock waves, its explosive load decreases gradually as the rearward Angle increases. As the height increases, the explosive load decreases first, then increases and then decreases. The overpressure time history curve of each point on the cylindrical storage tank is affected by the superposition of shock wave, reflection and diffraction of superimposed shock wave, and the peak overpressure in front of the device is slightly higher than that in the rear.