NASA High-Reynolds Number Circulation Control Research - Overview of CFD and Planned Experiments (Invited)

Milholen, William E.; Jones, Greg; Cagle, Christopher M.

doi:10.2514/6.2010-344

Cited by 19 publications

(13 citation statements)

References 1 publication

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“…The model is modular, allowing nearly all wing components to be replaced, and is well suited for future testing of other flow control concepts. Even though the wing has a moderate aspect ratio, the wing design represents the state-of-the-art in transonic wing design 13,14 and is an open geometry that can be distributed to the research community. The model is also unique in that it will allow circulation control strategies to be evaluated at transonic Mach numbers, where little research has been published 15 .…”

Section: Introductionmentioning

confidence: 99%

Enhancements to the FAST-MAC Circulation Control Model and Recent High-Reynolds Number Testing in the National Transonic Facility

Milholen

Jones

Chan

et al. 2013

31st AIAA Applied Aerodynamics Conference

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A second wind tunnel test of the FAST-MAC circulation control model was recently completed in the National Transonic Facility at the NASA Langley Research Center. The model was equipped with four onboard flow control valves allowing independent control of the circulation control plenums, which were directed over a 15% chord simple-hinged flap. The model was configured for low-speed high-lift testing with flap deflections of 30 and 60 degrees, along with the transonic cruise configuration with zero degree flap deflection. Testing was again conducted over a wide range of Mach numbers up to 0.88, and Reynolds numbers up to 30 million based on the mean chord. The first wind tunnel test had poor transonic force and moment data repeatability at mild cryogenic conditions due to inadequate thermal conditioning of the balance. The second test demonstrated that an improvement to the balance heating system significantly improved the transonic data repeatability, but also indicated further improvements are still needed. The low-speed highlift performance of the model was improved by testing various blowing slot heights, and the circulation control was again demonstrated to be effective in re-attaching the flow over the wing at off-design transonic conditions. A new tailored spanwise blowing technique was also demonstrated to be effective at transonic conditions with the benefit of reduced mass flow requirements.

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Section: Introductionmentioning

confidence: 99%

Enhancements to the FAST-MAC Circulation Control Model and Recent High-Reynolds Number Testing in the National Transonic Facility

Milholen

Jones

Chan

et al. 2013

31st AIAA Applied Aerodynamics Conference

View full text Add to dashboard Cite

show abstract

“…Even though the wing has a moderate aspect ratio, it represents the state-of-the-art in transonic super-critical wing design. 27,28 The model is offset from the tunnel sidewall using a 2.0-inch nonmetric standoff, 29 which has a profile shape identical to that of the fuselage centerline.…”

Section: A Test Articlementioning

confidence: 99%

Transonic Drag Reduction Through Trailing-Edge Blowing on the FAST-MAC Circulation Control Model

Chan

Jones

Milholen

et al. 2017

35th AIAA Applied Aerodynamics Conference

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“…AFC research has shown promise in its ability to increase aerodynamic performance of existing conventional aircraft designs, as well as leading to the development of non-conventional aircraft designs. 1 There are many varieties of AFC, but the one technique that is of interest for upcoming tests at the NTF that will utilize the NTF-117S balance is the area of circulation control. The concept of circulation control works by increasing the velocity of the airflow over the leading edge and/or trailing edge of a wing using high-pressure air that is ejected out of a set of blowing slots.…”

Section: E Ntf Circulation Control Testingmentioning

confidence: 99%

“…1 The new flow control and propulsion simulation capability at the NTF is focused on the use of semi-span models due to the relative ease of routing high-pressure air to the model, and the increased model size compared to a conventional sting mounted full-span model. The increased model size allows higher model fidelity, as well as increased internal volume for housing the flow control mechanisms and instrumentation.…”

Section: Introductionmentioning

confidence: 99%

High-Reynolds Number Active Blowing Semi-Span Force Measurement System Development

Lynn

Rhew

Acheson

et al. 2012

28th Aerodynamic Measurement Technology, Ground Testing, and Flight Testing Conference

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Recent wind-tunnel tests at the NASA Langley Research Center National Transonic Facility utilized high-pressure bellows to route air to the model for evaluating aircraft circulation control. The introduction of these bellows within the Sidewall Model Support System significantly impacted the performance of the external sidewall mounted semi-span balance. As a result of this impact on the semi-span balance measurement performance, it became apparent that a new capability needed to be built into the National Transonic Facility's infrastructure to allow for performing pressure tare calibrations on the balance in order to properly characterize its performance under the influence of static bellows pressure tare loads and bellows thermal effects. The objective of this study was to design both mechanical calibration hardware and an experimental calibration design that can be employed at the facility in order to efficiently and precisely perform the necessary loadings in order to characterize the semi-span balance under the influence of multiple calibration factors (balance forces/moments and bellows pressure/temperature). Using statistical design of experiments, an experimental design was developed allowing for strategically characterizing the behavior of the semi-span balance for use in circulation control and propulsion-type flow control testing at the National Transonic Facility.

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NASA High-Reynolds Number Circulation Control Research - Overview of CFD and Planned Experiments (Invited)

Cited by 19 publications

References 1 publication

Enhancements to the FAST-MAC Circulation Control Model and Recent High-Reynolds Number Testing in the National Transonic Facility

Enhancements to the FAST-MAC Circulation Control Model and Recent High-Reynolds Number Testing in the National Transonic Facility

Transonic Drag Reduction Through Trailing-Edge Blowing on the FAST-MAC Circulation Control Model

High-Reynolds Number Active Blowing Semi-Span Force Measurement System Development

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