Flow Control Research and Applications at the AFRL's Air Vehicles Directorate

Tilmann, Carl P.; Kimmel, Roger L.; Addington, Gregory; Myatt, James

doi:10.2514/6.2004-2622

Cited by 34 publications

(11 citation statements)

References 25 publications

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“…Techniques for altering the viscous flow structures at these high-lift conditions are highly desirable due to the increased potential for improved efficiency. A variety of flow control applications based on active systems have been investigated in recent years [2][3][4][5][6][7][8][9]. Several studies were aimed at improving the performance of airfoils at high incidence by addressing the problem of leading-edge separation [10][11][12][13][14][15].…”

mentioning

confidence: 99%

Flow Control for the Systematic Buildup of High-Lift Systems

Shmilovich

Yadlin

2008

Journal of Aircraft

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Enhanced high-lift airplane performance using active flow control is investigated. A computational fluid dynamics process has been developed for flow simulations in conjunction with active control. The analysis tool has been validated with experimental data and it has been extensively used to gain insight into high-lift flows that are subject to various modes of actuation. The computational method has been used for a methodical buildup of distributed flow control systems with substantial gains in aerodynamic efficiency. The versatility of the distributed active flow control offers a high payoff for the practical airframe integration of high-lift systems.= reduced forcing frequency, f c=U 1 f = actuator frequency, Hz h = actuator slot width L=D = lift-to-drag ratio U j =U 1 = ratio of jet actuator peak velocity to freestream velocity u x = streamwise component of the velocity vector = angle of attack flap = flap deflection angle j = 1 = ratio of jet actuator density to freestream density

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confidence: 99%

Flow Control for the Systematic Buildup of High-Lift Systems

Shmilovich

Yadlin

2008

Journal of Aircraft

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“…In unmanned aerial vehicles (UAVs) the propulsion system can drive the length of the vehicle [1]. The propulsion system length is driven by the ability to design the shortest inlet duct while still maintaining uniform, high total pressure recovery flow at the duct exit and fitting the inlet duct around other critical components within the aircraft.…”

Section: Introductionmentioning

confidence: 99%

“…The propulsion system length is driven by the ability to design the shortest inlet duct while still maintaining uniform, high total pressure recovery flow at the duct exit and fitting the inlet duct around other critical components within the aircraft. Any decrease in characteristic length of the propulsion system will lead to a shorter, lighter, and therefore less costly aircraft [1]. Serpentine inlet ducts are being considered as a design solution to shorten the overall propulsion system length and allow the inlet to fit around other critical components of the aircraft.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Inlet Active Flow Control

Smith¹,

Scribben²,

Goettke³

2007

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“…7 High chamber pressure is generated by rapidly heating the gas inside the SparkJet using an electrical discharge. The pressure is relieved by exhausting the heated air through an orifice.…”

Section: Actuator Description and Operationmentioning

confidence: 99%

SparkJet Actuators for Flow Control

Cybyk

Simon

Land

et al. 2007

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.

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Flow Control Research and Applications at the AFRL's Air Vehicles Directorate

Cited by 34 publications

References 25 publications

Flow Control for the Systematic Buildup of High-Lift Systems

Flow Control for the Systematic Buildup of High-Lift Systems

Computational Study of Inlet Active Flow Control

SparkJet Actuators for Flow Control

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