Quote:
Originally Posted by TomcatViP
Dyn Stall =
A stall that has its root in a dynamic phenomena. A stall is essentially linear : the AOA increase (or the speed decrease at a given aoa). In the dyn stall the flow ard the wing is disturbed briefly inducing non linear effect
The source can be mechanical (aileron reversing), aerodynamic (temp vortex) or thermal (critical temp inducing critical external pressure change - eg turbulences)
An example will be the rotor blade turning around it's axis. The blade AoA hve to be raised when the blade travel backward in order to compensate for the loss of speed and equilibrate the lift generated by the rotor.
At certain speed the AoA variation can be critical to the airflow generating vortex on top of the blade that prevent the normal airflow circulation. The flow is separated at a higher than normal speed and the blade is stalled (generating a high amount of drag).
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Agreed in that your definition agrees with the links I have posted thus far..
S!