Application of Dynamic Slot Technology to Rotors for Dynamic Stall Elimination

CERT Task 9.1.3 PIs:S.M. Ruffin and D.N. Mavris

Investigate use of active slots to eliminate dynamic stall and lead to faster, more agile rotorcrafts with efficient, low noise rotors.

Leading edge of dynamically slotted rotor
Small plates open when blade is retreating and close when advancing.

Background

Dynamic stall on retreating blade degrades performance and induces large vibration levels.
Fixed, high-lift /stall control devices (e.g. slats) result in higher drag & pitching moment on advancing blades.
Aero/structural loads on small moving plates (above) much lower than on moving leading edge slats.
Low power, active systems are needed for optimum performance at all azimuthal locations and in maneuvers.

Collaborate with Army AFDD and MDHS in geometry selection & code validation studies.
Conduct (2D Unsteady) CFD analysis of Dynamically Slotted airfoils to understand DS aerodynamics.
Utilize the Georgia Tech Full Potential / Navier Stokes 3-D rotor code to predict unsteady flow field for conventional, slotted and DS rotors.
Quantify effectiveness of DS rotor in eliminating low AoA drag penalty and mitigating dynamic stall
Incorporate wake model into modified NAV-3DAE to predict unsteady aeroeleastic effects.
Quantify (using tools like GTPDP and EVMCEP) effects on overall vehicle performance,maneuverability, payload capability and affordability.

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