| This thesis presents basic researches on spraying and atomization process of the liquid propellant - key issue of regenerative liquid propellant gun interior ballistic process. The distributing properties of droplet sizes in atomization field of liquid propellant HY911 were experimentally, theoretically and numerically investigated.A lot of photographs of atomization field on high pressure jet were obtained by the use of the energetic liquid injection device and laser holographic system, so that the properties of axial and radial droplets size distribution were revealed. The relations of droplet size distribution with injection pressures, nozzle and viscosity were discussed.A distribution function of droplet volume was derived using the information entropy. A simple model for primary breakup of energetic liquid jets was established using unstable wave theory. Based on the jet-embedding method , the jet-core shape, the distribution of jet velocity and the primary distribution of liquid drops were computed. A model in which second atomization and collision among droplets was considered, for the droplet size distribution of energetic liquid jet was established on the basis of primary breakup model. The numerical simulation is carried out and the Sauter mean diameter and the axial and radial size distribution of droplet of round jets and annular jets were obtained. Numerical results are in good agreement with experimental data.
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