Vortex ring state as a cause of a single-rotor helicopter unanticipated yaw

2022 ◽  
Author(s):  
Vadim V. Efimov ◽  
Konstantin O. Chernigin
Keyword(s):  
Vortex Ring ◽  
Vortex Ring State

Technical Note: Finite State Induced Flow Model in Vortex Ring State

2000 ◽  
Vol 45 (4) ◽  
pp. 318-320 ◽  
Author(s):  
Chengjian He ◽  
C. S. Lee ◽  
Weibin Chen
Keyword(s):  
Vortex Ring ◽  
Flow Model ◽  
Technical Note ◽  
Finite State ◽  
Induced Flow ◽  
Vortex Ring State

The Vortex Ring State as a Spatially and Temporally Developing Wake Instability

2004 ◽  
Vol 49 (2) ◽  
pp. 160-175 ◽  
Author(s):  
J. Gordon Leishman ◽  
Mahendra J. Bhagwat ◽  
Shreyas Ananthan
Keyword(s):  
Vortex Ring ◽  
Wake Instability ◽  
Vortex Ring State

Study on the Vortex Ring State of Helicopter and Flight Training Operation

2014 ◽  
Vol 908 ◽  
pp. 245-248
Author(s):  
Yu Qian ◽  
Xiao Jun Xiang ◽  
Jun Li Yang
Keyword(s):  
Vortex Ring ◽  
Tip Vortex ◽  
Flight Training ◽  
Flow State ◽  
Unsteady Aerodynamic ◽  
Helicopter Flight ◽  
Shaft Torque ◽  
Vortex Ring State ◽  
The Waves ◽  
And Training

Vortex ring state (VRS) is an inherently unsteady aerodynamic phenomenon. For rotor operations in the VRS, an inherent unsteadiness is a characteristic of the flow state, which is reflected by the waves and knots produced on the tip vortex filaments. Operationally, entry into the VRS manifests as rotor thrust fluctuations and also an increase in the average rotor shaft torque, the latter which is necessary to overcome the higher induced aerodynamic losses associated with rotor operations inside its own wake. Arming to the flight safety, the VRS development is discussed, the VRS models are summarized, and the operations for flight out VRS are given at the end of this paper. It is helpful to helicopter flight and training.

Momentum Theory, Dynamic Inflow, and the Vortex‐Ring State

1982 ◽  
Vol 27 (3) ◽  
pp. 18-24 ◽  
Author(s):  
David A. Peters ◽  
Shyi‐Yaung Chen
Keyword(s):  
Vortex Ring ◽  
Momentum Theory ◽  
Vortex Ring State

The Nature of Vortex Ring State

2011 ◽  
Vol 56 (2) ◽  
pp. 22001-2200114 ◽  
Author(s):  
Albert Brand ◽  
Mark Dreier ◽  
Ron Kisor ◽  
Tom Wood
Keyword(s):  
Vortex Ring ◽  
Vortex Ring State

Prediction of Vortex Ring State Boundary of a Helicopter in Descending Flight by Simulation

2008 ◽  
Vol 53 (2) ◽  
pp. 139-151 ◽  
Author(s):  
Pierre-Marie Basset ◽  
Chang Chen ◽  
J. V. R. Prasad ◽  
Sébastien Kolb
Keyword(s):  
Vortex Ring ◽  
State Boundary ◽  
Vortex Ring State
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