A Novel Leading Edge Vortex Onset Criterion for An Airfoil Undergoing Constant Pitch Rate Motion
Sadek, Shereef A . 2021
In this paper, a novel criterion for predicting Leading Edge Vortex (LEV) onset is proposed
for an airfoil undergoing constant pitch rate motion at low Reynolds’ number using unsteady
panel method. The criterion is obtained by decomposing the leading edge instantaneous tangential
velocity into three components due to free steam, wake induced velocity and self-induced
components. A three-dimensional plot is constructed using the decomposed components as coordinates
and the location of separation points identified using data available in the literature
as well as CFD simulations. Separation points for different pitch rates are shown to fall on the
same planar surface in three-dimensional space using the decomposed velocity components.
The proposed criterion agrees perfectly with data in the literature for low as well as high pitch
rates.
This paper studies the pressure variation that exists on the converging mixing section wall
of a supersonic ejector for refrigeration application. The objective is to show that the ejector…
In this paper, a novel criterion for predicting Leading Edge Vortex (LEV) onset is proposed
for an airfoil undergoing constant pitch rate motion at low Reynolds’ number using unsteady
…