Flight Test of an Active Flow Control Enhanced Vertical Tail

Whalen, Edward A.; Shmilovich, Arvin; Spoor, Marc; Tran, John; Vijgen, P. M. H. W.; Lin, John C.; Andino, Marlyn Y.

doi:10.2514/1.j056959

Cited by 62 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both subscale and full-scale tests showed a 20% side force increase corresponding to similar C μ (≈0.65% and ≈0.55%, respectively) for the fluidic oscillators of the similar design and spacing, which confirms that C μ is a reasonably good parameter to use for scaling-up of AFC actuators from subscale to full-scale tests. The successful full-scale wind tunnel testing of this AFC application (i.e., achieving the side force increase of 20% or greater) cleared the way for a subsequent flight demonstration on the Boeing 757 ecoDemonstrator in 2015 [31].…”

Section: Discussionmentioning

confidence: 99%

Active Flow Control on Vertical Tail Models

Andino

Lin

Seele³

et al. 2019

AIAA Journal

Self Cite

View full text Add to dashboard Cite

Active flow control (AFC) subscale experiments were conducted at the Lucas Wind Tunnel of the California Institute of Technology. Tests were performed on a generic vertical tail model at low speeds. Fluidic oscillators were used at the trailing edge of the main element (vertical stabilizer) to redirect the flow over the rudder and delay or prevent flow separation. Side force increases in excess of 50% were achieved with a 2% momentum coefficient (C μ) input. The results indicated that a collective C μ of about 1% could increase the side force by 30-50%. This result is achieved by reducing the spanwise flow on the swept back wings that contributes to early flow separation near their tips. These experiments provided the technical backdrop to test the full-scale Boeing 757 vertical tail model equipped with a fluidic oscillator system at the National Full-scale Aerodynamics Complex 40-by 80-foot Wind Tunnel, NASA Ames Research Center. The C μ is shown to be an important parameter for scaling a fluidic oscillator AFC system from subscale to full-scale wind tunnel tests. The results of these tests provided the required rationale to use a fluidic oscillator AFC configuration for a follow-on flight test on the Boeing 757 ecoDemonstrator. Nomenclature

show abstract

Section: Discussionmentioning

confidence: 99%

Active Flow Control on Vertical Tail Models

Andino

Lin

Seele³

et al. 2019

AIAA Journal

Self Cite

View full text Add to dashboard Cite

show abstract

“…On fixed wing UAVs, it has been shown in subsonic flight that CC has the potential to replace moving parts for manoeuvrability control (14) . Other active flow control systems are also being studied, such as to allow for a reduction in the vertical tail size of commercial aircraft (15,16) .…”

Section: Review Of Related Workmentioning

confidence: 99%

Design study of Coanda devices for transonic circulation control

Forster

Steijl

2017

Aeronaut. j.

View full text Add to dashboard Cite

Circulation control via blowing over Coanda surfaces at transonic freestream Mach numbers is investigated using numerical simulations. The performance and sensitivity of several circulation control devices applied to a supercritical aerofoil are assessed. Different Coanda devices were studied to assess the effect of Coanda radius-to-slot height ratio, nozzle shape and Coanda surfaces with a step. The range of operating conditions for which a supersonic Coanda jet remained attached at transonic freestream conditions were extended by increasing the radius of curvature at the slot exit for Coanda devices with a converging nozzle. Additional improvements were found by reducing the strength of shock boundary-layer interactions on the Coanda surface by expanding the jet flow using a converging-diverging nozzle and also by introducing a step between the Coanda surface and the nozzle exit. The performance when using a converging-diverging nozzle can be matched using a simple stepped Coanda device. It is shown that circulation control has the potential to match the performance of traditional control surfaces during regimes of attached flow at transonic speeds, up to an equivalent aileron deflection angle of 10°. In addition, lift augmentation ratios ΔCl/Cμof over 100 were achieved.

show abstract

“…Fluidic oscillators have been used for noise reduction [5], combustion control [6], and separation control [7,8] as the detailed reviews can be found in the literature [9,10]. A recent flight test completed by Boeing [11] has shown that an array of fluid oscillators can delay the flow separation on an aircraft's tail, which would allow design of smaller tails thus results in reduced drag and improved overall fuel economy. Although aerodynamic improvements have vital importance for air vehicles, it has also become very important for ground vehicles such as automobiles, trucks, and trains due to the strict regulations and competition.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Oscillator Length on the Characteristics of a Feedback Type Fluidic Oscillator

Tomac¹

2020

Academic Platform Journal of Engineering and Science

View full text Add to dashboard Cite

This work characterizes the various length fluidic oscillators with constant depth and having the same main geometric dimensions. A change in fluidic oscillator's length affects the frequency and sweeping characteristics of the fluidic oscillators. These characteristics were extracted by means of constant temperature anemometry hot-wire measurements and water flow visualizations. A total number of ten fluidic oscillators were compared to the baseline fluidic oscillator design. It was observed that shortening the fluidic oscillator ceases the oscillations after a threshold oscillator length whereas elongating the fluidic oscillator decreases the frequency and sweep angle gradually. Furthermore, the frequency maps obtained from hot-wire measurements for each considered fluidic oscillator design provided overall detail about the frequency of the oscillations for a wide range of flow rate. For a constant supply flow rate where the frequency and the sweep angle of an oscillator is constant, changing the length of a fluidic oscillator will allow varying these characteristics of the oscillator. Thus the oscillator can be tailored for a specific need of an application.

show abstract

Flight Test of an Active Flow Control Enhanced Vertical Tail

Cited by 62 publications

References 15 publications

Active Flow Control on Vertical Tail Models

Active Flow Control on Vertical Tail Models

Design study of Coanda devices for transonic circulation control

Effect of the Oscillator Length on the Characteristics of a Feedback Type Fluidic Oscillator

Contact Info

Product

Resources

About