Journal of Computational Fluids Engineering ISSN:1598-6071(Print) 3022-6252(Online) 한국전산유체공학회지

An aerodynamic analysis was performed for the effect of prop-to-pod distance on the oscillating aerodynamic force of the lift prop system in hover using computational fluid dynamics methodology. The aerodynamic forces of the prop and the pod oscillated by the aerodynamic interaction between the prop and the pod, which were caused by the increased pressure on the lower surface of the blade as the prop blade passes over the pod and the increased pressure on the upper surface of the pod due to downwash of the prop. The oscillating aerodynamic forces were generated at 2/rev due to the prop with two blades. As the distance between the prop and the pod increases, the aerodynamic interaction between the prop and the pod decreases, so the amplitude of the oscillating aerodynamic force of the prop and pod also decreases. The frequency analysis of the oscillating Fz aerodynamic component showed that the amplitude was the largest at the BPF of the prop, 2/rev, and decreased at the BPF and harmonic frequencies as the distance between the prop and the pod increased.