DYNAMICS OF A VORTEX RING AROUND A MAIN ROTOR HELICOPTER

摘要

The main goal of the work was an analysisof the dynamics of vortex ring formation processand determinants of the occurrence of vortexrings state (VRS) in a main rotor of ahelicopter. VRS occurs in the vertical decent ofa helicopter (or close to this maneuver). Thepaper presents a results obtained by CFDanalysis and from the wind tunnel testinvestigation. The visualization of a flow fieldprovided information on the changing nature ofthe flow in the course of the movement ofhelicopter.