Numerical investigation of a plume particle of underwater solid rocket motor penetration into water

Aluminum in solid rocket propellants is a highly desirable ingredient for many a pplications. This paper aims to have a deep understanding of the influence of high temperature particles in the plume on motor performance and bubbles of underwater jet. In this paper, a numerical computational model has been developed incorporating the dy namic meshing technique with multiphase Volume of Fluid (VOF) method which simulates the transient motion of a plume particle through the gas-fluid interface. Variation of the particle movement is investigated by varying solid-liquid contact angle, particle diameter and velocity. For values of Bo>8, plume particles move through the gas-fluid interface via the trailing transport configuration. Numerical calculations results which the form and breakup of tailing in conjunction with experiment in the references verifies the validity of this model. With this model, this paper also analyzes the characteristics of a particle in the plume, such as the form of cavity, rebound and velocity oscillations. The results of simulation indicate that critical velocity has the greatest impact on behavior of a particle; particle with different speed break up different regions of bubbles of underwater jet, thus both structure of jet and thrust characteristic of underwater solid rocket motor are affected, the plume particles which has critical speed show different characteristics. Besides, the diameter of plume particle and solid-liquid contact angle have a slight impact on the movement of plume particle.