Interaction of a Synthetic Jet with Separated Flow over a Vertical Tail

Jansen, Kenneth E.; Rasquin, Michel; Farnsworth, John; Rathay, Nicholas; Monastero, Marianne C.; Amitay, Michael

doi:10.2514/1.j056751

Cited by 23 publications

(11 citation statements)

References 35 publications

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“…Actuation on the rudder instead of the main body as well as with a blowing angle perpendicular to the rudder hinge line is also more effective. The numerical simulations of Jansen et al [25] and Shmilovich et al [26] are in good agreement with the experiment in terms of side force prediction. Simulations allow also to investigate alternative AFC strategies.…”

Section: Introductionsupporting

confidence: 74%

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Performance Enhancement of a Vertical Tail Model with Sweeping Jets

2020

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Active flow control to delay the flow separation on the rudder of two different models has been investigated in the ONERA L1 wind tunnel. The first model was used as a simplified test case and consisted in a flat plate with a rudder. Different types of actuation were investigated: continuous/pulsed blowing through slots, continuous blowing through segmented slots and sweeping jets. The lift increments of these different types of actuation were compared not only in terms of mass flow rate but also in terms of momentum and power coefficients. Active flow control by sweeping jets was selected to be tested on the second model which is a scale 1:2 vertical tail model of a generic business jet. Side force increments up to 80% were achieved with a 2% value of C μ coefficient. Side force increments of 50% were also reached with a lower C μ value of 0.5%. These side force increments could lead to a reduction of vertical tail plane wetted area and weight and consequently to a reduction of drag cruise and fuel consumption.

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Section: Introductionsupporting

confidence: 74%

“…AFC on VTP with synthetic jets has also been studied both experimentally [22]- [24] and numerically [25]- [26]. A side force increment of 18% was obtained for C μ = 0.7% and a non-dimensionalized rudder deflection angle δ* equal to 0.5 [22].…”

Section: Introductionmentioning

confidence: 99%

Performance Enhancement of a Vertical Tail Model with Sweeping Jets

2020

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“…The former studies are typically devoted to evaluate the effectiveness of such devices to improve the performances of an aircraft. In this framework, the works are also intended to solve practical problems and give design guidelines for the implementation of the actuators on aircraft components, such as wings [3] and vertical tails [4]. The potential impact of this technology on the performances of the aircraft (for example, in terms of reduced fuel consumption) has been also discussed [5].…”

Section: Introductionmentioning

confidence: 99%

Receptivity to synthetic jet actuation in boundary layer flows

Palumbo

Semeraro

Robinet

et al. 2020

AIAA Scitech 2020 Forum

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The flow field generated by the interaction between a zero-net-mass-flux (synthetic) jet and a boundary layer crossflow is studied in the present work. The investigation consists in Direct Numerical Simulations (DNS) of the resulting unsteady field, for various boundary layer Reynolds numbers Re δ * 0 and jet reduced frequencies F + . In particular, the actuation frequency is chosen in order to match the unstable (or less stable) frequency of the incoming crossflow. The analysis is focused on the near-field behaviour of the flow, i.e. next to the jet exit orifice, and in the downstream region. It has been found that the presence of the jet deeply modifies the boundary layer transition. Indeed, the instantaneous flow field is characterized by the presence of unsteady, hairpin-like vortical structures, similar to the ones generated by localized roughness elements. Moreover, streaky structures can be detected in the time-averaged flow field. The overall behaviour of the flow field (investigated via time-averaged boundary layer integral parameters) allows to state that early transition can be achieved by using SJ devices. This work is part of a wider project which aims at realizing a reduced-order modeling of a piezo-driven synthetic jet in crossflow, based on simulations and lumped element modeling of the actuator.

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“…The use of synthetic jet (SJ) actuators for flow control has become widespread during the last years. Their application field is nowadays very wide, including flow separation control [1], optimization of the aerodynamic forces of lifting surfaces on aircraft [2] and wind energy systems [3], jet cooling [4] and many other activities. The rise in popularity of synthetic jet actuators has been driven by the fact that they are able to produce global changes to an incoming flow with low power consumption and reduced sizes [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control

Palumbo

Luca

2021

Actuators

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The paper presents a joint experimental and numerical characterization of double-orifice synthetic jet actuators for flow control. Hot-wire measurements of the flow field generated by the device into a quiescent air environment were collected. The actuation frequency was systematically varied to obtain the frequency response of the actuator; its coupled resonance frequencies were detected and the velocity amplitude was measured. Direct numerical simulations (DNS) of the flow field generated by the device were subsequently carried out at the actuation frequency maximizing the jet output. The results of a fine-meshed parametric analysis are outlined to discuss the effect of the distance between the orifices: time-averaged flow fields show that an intense jet interaction occurs for small values of the orifice spacing-to-diameter ratio; phase-averaged velocity and turbulent kinetic energy distributions allow to describe the vortex motion and merging. A novel classification of the main regions of dual synthetic jets is proposed, based on the time- and phase-averaged flow behaviour both in the near field, where two distinct jets converge, and in the far field, where an unique jet is detected. The use of three-dimensional DNS also allows to investigate the vortex merging for low values of the jet spacing. The work is intended to provide guidelines for the design of synthetic jet arrays for separation control and impinging configurations.

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Interaction of a Synthetic Jet with Separated Flow over a Vertical Tail

Cited by 23 publications

References 35 publications

Performance Enhancement of a Vertical Tail Model with Sweeping Jets

Performance Enhancement of a Vertical Tail Model with Sweeping Jets

Receptivity to synthetic jet actuation in boundary layer flows

Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control

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