Analysis On Atomization Characteristics And Influencing Factors Of Energetic Liquid Jet Under High Ambient Pressure

Liquid propellants are mainly used in liquid propellant guns and liquid traveling charge guns. They play a very important role in projectile thrust providing by combustion gunpowder gas. The stability of liquid propellant atomization and combustion is of great significance in guaranteeing internal ballistics attributes. Therefore, on the background of liquid propellant guns and liquid traveling charge guns, two kinds of injectors are studied:the cylindrical injector and the annular injector. The numerical simulation of the liquid jet characteristics of the two injectors which is under different back pressures and different orifice diameters are conducted in the combustion chamber with high ambient pressure.Based on the experiment of the liquid jet breakup and atomization characteristics under high ambient pressure, a two-dimensional unsteady gas/liquid two-phase flow model is established. Combining with the k-ε turbulence equations, the basic equations of fluid flowing, the Euler method is used to simulate the process of development of energetic liquid jet in the spray field. Also, the variation of energetic spray structure, spray breakup points and aggregation points are analysed under different injector structure, different ambient pressures and different orifice diameters.In addition, based on the experimental study on energetic liquid atomization characteristic, a two-dimensional unsteady model through using Fluent software and DPM model is established. Among of this, the droplet size and its distribution are expressed by Rosin-Rammler droplet size distribution function, the fluid model is known as WAVE model. The Lagrange particle tracing method is used to simulate the atomization characteristic of annular energetic liquid jet in the spray field, meanwhile, the Sauter average diameter of energetic liquid and spray and their axial distribution are analysed under different distinct injection pressures and back pressures.Liquid traveling charge gun interior ballistic process contains the projectile motion and the chamber pressure variation. On the background of that, a kind of dynamic mesh two-dimensional unsteady gas/liquid phase model is established. The project utilized UDF definition of grid motion to simulate the process of development of energetic liquid jet in the spray field in the different rates of grid movement.