DYNAMICS OF A VORTEX RING AROUND A MAIN ROTOR HELICOPTER

摘要

The main goal of the work was an analysis of the dynamics of vortex ring formation process and determinants of the occurrence of vortex rings state (VRS) in a main rotor of a helicopter. VRS occurs in the vertical decent of a helicopter (or close to this maneuver). The paper presents a results obtained by CFD analysis and from the wind tunnel test investigation. The visualization of a flow field provided information on the changing nature of the flow in the course of the movement of helicopter.