Research of Cavitation Flow Inside the Nozzle of Regenerative Liquid Propellant Gun

Abstract

To study the influence of cavitation effect in the nozzle of regenerative liquid propellant gun(RLPG)on the jet atomization,the Euler multiphase-flow model and cavitation model were established for the common nozzle forms. The relative cavitation flow phenomenon in the nozzle was studied,and the effects of the nozzle structure,internal angle and injection pressure on cavitation and flow states at the exit were analyzed. Numerical results indicate that the RNG k-ε turbulence model is more suitable for the simulation of cavitation than the k-ε turbulence model. The cavitation phenomenon happens inside the cylindrical nozzle and the conical nozzle. With the increase of the internal angle of conical nozzle,the cavitation enhances,and the air-liquid mixing area becomes larger,but the flow velocity is impaired. It is beneficial to the formation of stable cavitation flow that the injection pressure is greater than 10 MPa. The study results provide the theoretical basis for the optimization of nozzle structure design,and promote the further research of the breakup,atomization,evaporation and combustion process of the jet in the combustion chamber.