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Module 12. Helicopter aerodynamics, structures and systems

On a helicopter, what is vortex ring state?

  • Ground vortex interference when hovering close to the ground.
  • Tip vortex interference at high forward speed.
  • Tip vortex build-up during hover.

Explanation

Vortex ring state arises when the rotor settles into its own recirculating tip-vortex wake at low or zero forward speed, so the blades meet their own downwash and lift collapses. It is a low-speed recirculation phenomenon, not something that occurs at high forward speed or simply from proximity to the ground.

bhavon asking:

please explain the answer

Community Comments (2)

A
ame1999 Posts: 1 14.02.2018 / 11:54
Plz share the Q-Bank
J
Jordi Posts: 198 01.09.2021 / 11:08
https://www.easa.europa.eu/research-projects/helicopter-vortex-ring-state-experimental-research#:~:text=The%20vortex%20ring%20state%20(VRS,induced%20main%20rotor%20flow%20rate.

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