A Sweeping Jet Application on a High Reynolds Number Semi-Span Supercritical Wing Configuration

Abstract

The FAST-MAC circulation control model was modified to test an array of unsteady sweeping-jet actuators at realistic flight Reynolds numbers in the National Transonic Facility at the NASA Langley Research Center. Two types of sweeping jet actuators were fabricated using rapid prototype techniques, and directed over a 15% chord simple-hinged flap. The model was configured for low-speed high-lift testing with flap deflections of 30° and 60°, and a transonic cruise configuration having a 0° flap deflection. For the 30° flap high-lift configuration, the sweeping jets achieved comparable lift performance in the separation control regime, while reducing the mass flow by 54% as compared to steady blowing. The sweeping jets however were not effective for the 60° flap. For the transonic cruise configuration, the sweeping jets reduced the drag by 3.3% at an offdesign condition. The drag reduction for the design lift coefficient for the sweeping jets offer is only half the drag reduction shown for the steady blowing case (6.5%), but accomplished this with a 74% reduction in mass flow.

Active Flow Control for Trailing Edge Flap Separation

“…Six actuators, spaced 3.3 cm apart, were in each SLA flap section. In preparation for a high Reynolds number AFC experiment, 16 this SWJ actuator configuration was previously used to e↵ectively control separation 4 at flap deflection angles up to 40 . Unlike the experiments described in Refs.…”

Effects of Bent Outlet on Characteristics of a Fluidic Oscillator with and without External Flow

“…Koklu and Owens [16] experimentally compared various flow control Energies 2021, 14, 4342 2 of 17 methods for flow on a ramp and confirmed that the fluidic oscillators were most effective in reducing the flow separation. Jones et al [17] studied the flow separation control on a highlift wing. Under the same conditions, fluidic oscillators showed similar lift performance with only 54% less mass flow rate compared with steady jet actuators.…”

Comparative Study of Active Flow Control Strategies for Lift Enhancement of a Simplified High-Lift Configuration

“…1, right side) that matches the performance of a conventional Fowler flap system, while minimizing the weight and power requirements of the AFC system. Pneumatic-powered AFC concepts, such as steady blowing through discrete convergent-divergent nozzles [6] or unsteady blowing through fluidic oscillators (often referred to as sweeping jet actuators) [8][9][10][11][12][13][14][15][16][17][18][19], have been investigated around the flap shoulder region during the course of this project.…”

“…For this configuration, the lift increased monotonically with increasing NPR, although the slope of the lift curve was reduced for NPR>2.0, as reported in Figs. (17)(18) of Ref. [20].…”