Numerical simulation of minor geometry characteristics and small orifice water mist swirl injector

Due to the deficiency of the maximum discharge principle with regard to the design of the minor geometry characteristics and small orifice water mist swirl injector, a numerical investigation on it was performed by simulating the inner flow field of two phase flow injector using the mixture model in Fluent, from which the flow rate and spray angel α were obtained and compared with the experimental data and the theoretical calculation results. The gas-liquid phase distribution, axial velocity and tangential velocity, pressure distribution in the injector were also investigated. The discrepancy between the investigation and the traditional design theory was discussed and the mechanism was concluded. The viscosity of liquid and the friction of wall were taken into account which made the simulation can describe the inner flow field of injector accurately and the numerical simulation provides a reference for the design of minor geometry characteristics and small orifice water mist swirl injector.