On Amplitude Scaling of Active Separation Control

Stalnov, Oksana; Seifert, Avi

doi:10.1007/978-3-642-11735-0_5

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…Most of the results presented used momentum coefficient, C μ , as the primary input. However, this is not a unique parameter driving the design of an AFC system [32][33][34] but certainly needs to be considered during the initial stages of design. It determines the amount of mass flow required for selecting size, layout, and number of actuators.…”

Section: Discussionmentioning

confidence: 99%

Active Flow Control on Vertical Tail Models

et al. 2019

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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

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Section: Discussionmentioning

confidence: 99%

Active Flow Control on Vertical Tail Models

et al. 2019

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“…Nagib et al (2006) conducted experiments on a highly deflected simple flap and concluded that the velocity ratio is a more appropriate parameter. They combined this with Strouhal number to form the new parameter Stalnov and Seifert (2008) considered five different scaling parameters for control using high-frequency and pulsed actuation and concluded that the Reynolds number-scaled momentum coefficient provided the best scaling for their data set.…”

Section: Extended Parameter Range and Comparison Of Techniquesmentioning

confidence: 99%