Computational Modeling of Vortex Ring State Modes of Helicopter Main Rotor at the basis of free wake vortical model

Aviation technics and technology


Ignatkin Y. M.1*, Makeev P. V.**, Shomov A. I.2***, Konstantinov S. G.1****

1. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
2. National Helicopter Center Mil & Kamov, 26/1, Garshina str., Tomilino, Moscow region, 140070, Russia



This research is dedicated to behavior of helicopter’s main rotor in the vertical descent by computational methods. Two actual methods of helicopter rotor aerodynamics modeling are used. At the first the method based on the non-linear blade vortical model (free-wake model). At the second the computational fluid dynamics (CFD) method. Results of computational modeling of main rotor at the vortex ring state modes are presented. Full aerodynamic characteristics, including all components of forces and moments of a rotor were received. Also in the focus of view are rotor flowing specifics. As a result of a work there was received and analyzed a set of features aimed at determination of VRS dangerous area. Comparative analysis of the results received of both used methods and its comparison with data of experimental and flight test are presented.


main rotor, computational methods of aerodynamics, CFD methods, free-wake model, vertical descent, vortex ring state mode, aerodynamic characteristics

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