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Numerical simulation of internal flow process in pressure swirl injector

WANG Kai;YANG Guohua;LI Pengfei;ZHANG Minqing;ZHOU Lixin;National Key Laboratory of Science and Technology on Liquid Propulsion Rocket Engine;College of Astronautics, Northwestern Polytechnical University;Shanghai Institute of Space Propulsion;  
Based on the calculation method of two-phase flow, Coupled Level Set+VOF, the internal flow processes of the open type and closing-in type pressure swirl injectors were simulated respectively. The whole fluid filling processes inside the pressure swirl injectors were showed visually.The flow characteristics and the detailed structure of flow field in the pressure swirl injectors were analyzed. The liquid film surface fluctuations and the vortexes in the gas phase existing in inner side of the liquid film surface are captured. The results show that the vortexes in the gas phase exist in inner side of the surface wave trough, and the central line of vortexes is located at the line where axial velocity component is zero; the axial velocity component and the tangential velocity component at thenozzle exit show an obvious partition flow characteristics. There is the pressing and being pressed interaction between the wave troughs/wave crests of the liquid film surface waves and the vortexes in the gas phase, which is transferred by changing the shape of the interface between gas phase and liquid phase. In addition, the numerical results and experimental results of the external spray field are in good agreement, which indirectly shows that the numerical results of the internal flow field are relatively accurate.
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