Solid rocket motor sympathetic detonation based on SPH method numerical simulation study

DOI:	10.11809/bqzbgcxb2024.07.013
Keywords:	solid rocket motors; sympathetic detonation; SPH method; numerical simulation; explosion shock
Abstract:	Aiming at the sympathetic detonation phenomenon of solid rocket motors, numerical simulations were conducted by using the Smoothed Particle Hydrodynamics (SPH) method to model the sympathetic detonation process. The expansion process of detonation products at the initial stage of the donor motor explosion and the response of the acceptor motor to detonation product impact under different conditions were analyzed. The results show that the SPH method provides good agreement with the traditional Arbitrary Lagrangian Eulerian (ALE) method in simulating explosion shock response, with approximately 37.5% improvement in computational efficiency while ensuring the same simulation accuracy. When the donor and acceptor motors have the same arrangement, closer spacing and larger motor size lead to a more violent resonant explosion response. Additionally, when the spacing between the donor and acceptor motors is certain, parallel arrangement is more likely to cause sympathetic detonation phenomenon than vertical arrangement. For a parallel arrangement, the critical sympathetic detonation distance for 150 mm diameter motors is between 80 to 100 mm, greater than the critical detonation distance for 100 mm diameter motors, which is between 60 and 70 mm. For a vertical arrangement, the critical detonation distance for 100 mm diameter motors is between 50 and 60 mm. This research presents a method for numerical simulation of sympathetic detonation, providing valuable insights for the safe storage and use of solid rocket motors.
Published:	2024-07-26
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