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  • Fluid Mechanics and Thermodynamics  (1)
  • Fluid Mechanics and Thermodynamics; Aircraft Design, Testing and Performance  (1)
  • 1
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    Active Flow Control on Vertical Tail Models (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-06
    Description: 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(sub )) input. The results indicated that a collective C(sub ) of about 1% could increase the side force by 3050%. 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(sub ) 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.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NF1676L-29550 , AIAA Journal (ISSN 0001-1452) (e-ISSN 1533-385X); 57; 8; 3322-3338
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Performance Enhancement of a Full-Scale Vertical Tail Model Equipped with Active Flow Control (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper describes wind tunnel test results from a joint NASA/Boeing research effort to advance active flow control (AFC) technology to enhance aerodynamic efficiency. A full-scale Boeing 757 vertical tail model equipped with sweeping jet actuators was tested at the National Full-Scale Aerodynamics Complex (NFAC) 40- by 80-Foot Wind Tunnel (40x80) at NASA Ames Research Center. The model was tested at a nominal airspeed of 100 knots and across rudder deflections and sideslip angles that covered the vertical tail flight envelope. A successful demonstration of AFC-enhanced vertical tail technology was achieved. A 31- actuator configuration significantly increased side force (by greater than 20%) at a maximum rudder deflection of 30deg. The successful demonstration of this application has cleared the way for a flight demonstration on the Boeing 757 ecoDemonstrator in 2015.
    Keywords: Fluid Mechanics and Thermodynamics; Aircraft Design, Testing and Performance
    Type: NF1676L-19176 , AIAA SciTech 2015; Jan 05, 2015 - Jan 09, 2015; Kissimmee, FL; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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