Induced flow variation of the helicopter rotor operating in the vortex ring state.

1968 ◽  
Vol 5 (4) ◽  
pp. 381-386 ◽  
Author(s):  
AKIRA AZUMA ◽  
AKIRA OBATA
Keyword(s):  
Vortex Ring ◽  
Helicopter Rotor ◽  
Flow Variation ◽  
Induced Flow ◽  
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.

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