A comparative assessment of vibration control capabilities of a L-shaped Gurney flap
| Autor: | Valentina Motta, Giuseppe Quaranta |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Airfoil
Engineering rotorcraft Vibration control Aerospace Engineering 02 engineering and technology 01 natural sciences 010305 fluids & plasmas law.invention 0203 mechanical engineering law 0103 physical sciences vibration reduction Trailing edge Gurney flap 020301 aerospace & aeronautics Rotor (electric) business.industry Structural engineering aeroelasticity helicopter blades Vibration Flapping Helicopter rotor business |
| Zdroj: | The Aeronautical Journal. 120:1812-1831 |
| ISSN: | 2059-6464 0001-9240 |
| DOI: | 10.1017/aer.2016.109 |
| Popis: | This work presents the capabilities of a novel L-shaped trailing-edge Gurney flap as a device for vibration reduction. The primary effect of this L-tab is represented by a modification of the reference aerofoil mean line shape through by two counter-rotating vortical structures created at the trailing edge. The comparison of the aerodynamic loads generated by the novel L-tab Gurney flap and a classical trailing-edge flap allows to estimate the ranges of reduced frequency where the L-tab is expected to perform better than a trailing edge flap and vice versa. Linear aerostructural models for a typical section representative of a helicopter blade equipped with a partial-span L-tab or a trailing-edge flap are built, and a higher harmonic control algorithm is applied. Performance are compared between the two devices to reduce separately the N/rev harmonics of the blade root rotating frame vertical force, flapping and feathering moments. The attainment of similar results with classical trailing-edge device is a further confirmation of the potential feasibility of this novel L-tab as an effective alternative means for vibration reduction on rotor blades. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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