Investigating the Effect of Pulsed Jet Actuation at the Rudder Hinge Line of a Vertical Stabilizer with Phase-Locked PIV

Rohlfs, Lennart; Löffler, Stephan; Weiss, Julien

doi:10.2514/6.2020-1535

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…Due to geometrical limitations and the required flow control parameters (frequency and outlet velocity respectively momentum flow rate), the actuator geometry had to be folded. Results of wind-tunnel experiments with this configuration of FO-PJA are provided in [28][29][30]. The main difficulty in the design process of the complex FO-PJA system is to build an actuator that will fit into a specific aerodynamic geometry of a given size while simultaneously fulfilling the required flow control parameters.…”

Section: Example Of Fo-pjas Used In Practicementioning

confidence: 99%

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Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

Löffler

Ebert

Weiss

2021

Fluids

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The control of flow separation on aerodynamic surfaces remains a fundamental goal for future air transportation. On airplane wings and control surfaces, the effects of flow separation include decreased lift, increased drag, and enhanced flow unsteadiness and noise, all of which are detrimental to flight performance, fuel consumption, and environmental emissions. Many types of actuators have been designed in the past to counter the negative effects of flow separation, from passive vortex generators to active methods like synthetic jets, plasma actuators, or sweeping jets. At the Chair of Aerodynamics at TU Berlin, significant success has been achieved through the use of pulsed jet actuators (PJA) which operate by ejecting a given amount of fluid at a specified frequency through a slit-shape slot on the test surface, thereby increasing entrainment and momentum in a separating boundary layer and thus delaying flow separation. Earlier PJAs were implemented using fast-switching solenoid valves to regulate the jet amplitude and frequency. In recent years, the mechanical valves have been replaced by fluidic oscillators (FO) in an attempt to generate the desired control authority without any moving parts, thus paving the way for future industrial applications.

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Section: Example Of Fo-pjas Used In Practicementioning

confidence: 99%

“…Furthermore, the two-stage actuator design was adapted and optimized to control the flow separation at the pylon-wing junction of a real-scale model [26,27]. Later on, single-stage FO-PJAs were also used to control the three-dimensional (3D) flow separation on a vertical tail model [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

Löffler

Ebert

Weiss

2021

Fluids

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Fluidic-Oscillator-Based Pulsed Jet Actuation on a Vertical Tail

Löffler

Weiss

2023

AIAA Journal

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An industry-relevant vertical tail plane (VTP) model equipped with fluidic-oscillator-based pulsed jet actuators was tested with different active flow control (AFC) settings, rudder deflection, and sideslip angles at a chord Reynolds number of 1.3 million. In addition to pressure and force measurements, tuft visualizations and stereoscopic particle image velocimetry measurements were used to investigate AFC effects. With a total momentum coefficient of 1.5%, the control authority (lateral force) of the VTP was increased by a maximum of 34% when actuators were distributed along the rudder span. Additionally, flow control at dedicated positions on the rudder was investigated by using individual actuator segments. It was found that AFC is particularly effective at the position of the maximum load in the spanwise direction. The measurements also confirmed that local application of AFC actuators may simulate the effect of a boundary-layer fence. Finally, a comparison with existing results obtained with sweeping jet actuators shows that these two specific AFC implementations are most effective in different ranges of the momentum and the power coefficients.

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Investigating the Effect of Pulsed Jet Actuation at the Rudder Hinge Line of a Vertical Stabilizer with Phase-Locked PIV

Cited by 2 publications

References 12 publications

Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

Fluidic-Oscillator-Based Pulsed Jet Actuation on a Vertical Tail

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