论文信息 - Aerodynamic Characteristics of Airfoil with Perforated Gurney-Type Flaps

Aerodynamic Characteristics of Airfoil with Perforated Gurney-Type Flaps

A low-speed wind-tunnel experiment was conducted to examine the aerodynamic and near-wake characteristics of a NACA 0012 airfoil equipped with perforated Gurney-type flaps of different heights and porosities at Re = 2.32 × 10 5 . The perforation-generated jet flows disrupted the periodic wake behind the flap, reducing the effective camber effects, and led to a reduced lift and drag coefficient as well as a less negative peak C m , compared with the solid flap. The magnitude of C l,max , C d , and C m,peak decreased with increasing amount of perforation. The decrease in drag, however, outweighed the loss in lift and rendered an improved lift-to-drag ratio. The reduction of drag alongside the lowered lift was found to be closely coupled to the characteristics of the unsteady wake. A significantly narrowed extent of the unsteady wake with a weakened fluctuating intensity was observed.

Tim Lee

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