Effect of Passive Bleeding on Flow Structure over a Nonslender Delta Wing

Date

2017-08-01

Author

Celik, Alper
Cetin, Cenk
Yavuz, Mehmet Metin

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

170
views

0
downloads

The effect of passive bleeding on flow structure of a 45 deg swept delta wing is studied in a low-speed wind tunnel using techniques of laser-illuminated smoke visualization, surface-pressure measurements, and particle image velocimetry. Three different bleeding configurations are tested to identify the effectiveness of the control technique compared to a base planform for a broad range of attack angles 6 <= alpha <= 6deg at Reynolds numbers Re=3.5x10(4) and Re=10(5). The results indicate that all bleeding configurations alter the flowfield over the planform, where a proper bleeding induces significant improvement on the overall flow pattern. At sufficiently high angle of attack where pronounced surface separation appears on the base planform, the recovery of the vortical structures with significant increases in the magnitude of suction pressure coefficient -C-p, which implies the elimination of three-dimensional surface separation, is achieved with the corresponding bleeding configuration. On the contrary, at low attack angles, the bleeding causes reduction in the magnitudes of suction pressure coefficient -C-p in general, indicating a loss in suction performance of the planform. To conclude, the results confirm that the bleeding might effectively be used to eliminate the surface separation on nonslender delta wing.

Subject Keywords

NEAR-SURFACE TOPOLOGY, LEADING-EDGE VORTICES, VORTEX BREAKDOWN, REYNOLDS-NUMBER, AERODYNAMIC CHARACTERISTICS, SWEEP ANGLE, DIAMOND, SLENDER

URI

https://hdl.handle.net/11511/38263

Journal

AIAA JOURNAL

DOI

https://doi.org/10.2514/1.j055776

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

Control of Flow Structure over a Nonslender Delta Wing Using Periodic Blowing Cetin, Cenk; Celik, Alper; Yavuz, Mehmet Metin (2018-01-01) The effect of unsteady blowing through the leading edge on the flow structure over a 45 deg swept delta wing in relation to the steady blowing is experimentally studied in a low-speed wind tunnel using the techniques of surface-pressure measurements, particle image velocimetry, and laser-illuminated smoke visualization. The unsteady blowing in the form of a periodic square pattern at 25% duty cycle is provided at the excitation frequencies varying from 2 to 24 Hz for a fixed momentum coefficient. The flow s...
Effect of thickness-to-chord ratio on aerodynamics of non-slender delta wing Ghazijahani, Mohammad Sharifi; Yavuz, Mehmet Metin (2019-05-01) The effect of thickness-to-chord (t/C) ratio on aerodynamics of a non-slender delta wing with sweep angle of 45 degree is characterized in a low-speed wind tunnel using laser illuminated smoke visualization, surface pressure measurements, particle image velocimetry, and force measurements. The delta wings of t/C ratios varying from 2% to 15% with 45 degree windward beveled leading edges are tested. The results indicate that the effect of t/C ratio on flow structure is quite substantial. Considering the low ...
Effect of Thickness-to-Chord Ratio on Flow Structure of a Low Swept Delta Wing Gulsacan, Burak; Sencan, Gizem; Yavuz, Mehmet Metin (American Institute of Aeronautics and Astronautics (AIAA), 2018-12-01) The effect of thickness-to-chord (t/C) ratio on flow structure of a delta wing with sweep angle of 35 deg is characterized in a low-speed wind tunnel using laser-illuminated smoke visualization, particle image velocimetry, and surface pressure measurements. Four different t/C ratios varying from 4.75 to 19% are tested at angles of attack, 4, 6, 8, and 10 deg, for Reynolds numbers Re =1 x 10(4) and 3.5 x 10(4). The results indicate that the effect of thicknessto-chord ratio on flow structure is quite substan...
Effect of particle polydispersity on particle concentration measurement by using laser Doppler anemometry Ayranci, Isil; Pinguet, Guillaume; Escudie, Dany; Selçuk, Nevin; Vaillon, Rodolphe; Andre, Frederic (2007-08-01) Measurement of particle concentration by laser Doppler anemometry (LDA) is studied on a vertical air jet seeded by a powder disperser with controlled particle and air flow rates. Particle arrival rate is utilized to retrieve particle number densities from conventional LDA operation. The effect of polydisperse nature of the particles is assessed. Comparisons between measured and estimated particle number densities suggest that only a certain portion of the particle population with a particle size to fringe s...
Effect of ground on aerodynamics and longitudinal static stability of a non-slender delta wing Koçak, Göktuğ; Yavuz, Mehmet Metin (2022-11-01) © 2022 Elsevier Masson SASIn this paper, the effect of ground on aerodynamics and longitudinal static stability of a non-slender delta wing with sweep angle of 45 degree and thickness-to-chord ratio (t/c) of 5.9% was characterized at Reynolds number of 9×104 in a low-speed wind tunnel using force and pressure measurements. The measurements were conducted for angles of attack varying between 0≤α≤30 degrees and non-dimensional heights between 3%≤h/c≤107% and height stability of the wing based on aerodynamic c...

Citation Formats

A. Celik, C. Cetin, and M. M. Yavuz, “Effect of Passive Bleeding on Flow Structure over a Nonslender Delta Wing,” AIAA JOURNAL, pp. 2555–2565, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38263.