Numerical simulation of vortex instabilities in the wake of a preswirl pumpjet propulsor

A numerical analysis based on detached eddy simulations is conducted to investigate vortex instabilities in the wake of a preswirl pumpjet propulsor. Three models are established separate roles that rotor, stator, and duct play structure In this paper, only rotor considered. The results show system mainly composed tip vortices, hub vortex, trailing root vortices. vortices generated by premature shedding model compared with normal single propeller. existence increases stability vortex. Furthermore, unique multi-inductance instability mode called “overlap–forward” phenomenon, found for low values advance coefficient J. It depends not spiral-to-spiral distance but also highest-efficiency point inception moves farther downstream increasing J, whereas when J greater than propeller, stable length drops sharply. energy transfer process from blade harmonics shaft related spatial evolution