Abstract
The present work investigated the effects of bending the outlet nozzles of fluidic oscillators installed on the NACA0015 airfoil with a flap on the flow control performance and, thus, the aerodynamic performance of the airfoil. The effects of bending on fluidic oscillators have not been reported so far in previous works. The aerodynamic analysis was performed numerically using unsteady Reynolds-averaged Navier-Stokes equations. Three different cases were considered: Case 1 changes only the bending angle with a fixed pitch angle, Case 2 changes only the pitch angle without bending, and Case 3 changes both the bending and pitch angles. Although the bending of the oscillators was introduced inevitably due to a geometrical limitation in the installation, the results indicated that the bending rather improved the lift coefficient and lift-to-drag ratio of the airfoil by improving the characteristics of the fluidic oscillators, such as the jetting angle and peak velocity ratio.
Highlights
Flow separation that occurs on an aircraft wing negatively affects aerodynamic performance
Flow control technologies are classified into passive flow control (PFC) [1], which attaches various structures to the surface, and active flow control (AFC) [2], which uses actuators such as plasma actuators [3], backward traveling waves [4], and periodic surface morphing [5]
AFC has an advantage of removing the drag-increase problem, which is a disadvantage of PFC, and enables effective separation control [6]
Summary
Flow separation that occurs on an aircraft wing negatively affects aerodynamic performance. The effect of according the mounting position oscillators on the separation control was investigated to the angle of of the attack of the airfoil. Kim. conducted a study by adjusting the pitch fluidic fluidic toand control flow separation occurring on the flap of an angle airfoilof using a oscillators to control the flow separation occurring on the flap of an airfoil using a numernumerical analysis, referring to the experimental model of Melton [14]. Navier-Stokes and investigated applied fluidic oscillators to the flow control on an airfoil with a the effects of inlet nozzle width and distance between splitters on the fluidic oscillator flap, but they adjusted the pitch angle by bending the outlets of fluidic oscillators inevitably performance.
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