Unsteady flow structure and vorticity convection over the airfoil oscillating at high reduced frequency

Kuo, Cheng‐Hsiung; Hsieh, Jia-You

doi:10.1016/s0894-1777(01)00044-9

Cited by 17 publications

(12 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, it was noticed that when the flexibility was too high, the wing tip and root moved in inconsistent directions, which caused deteriorated aerodynamic performance. Kuo and Hsieh [15] studied on unsteady flow structure and vorticity convection over NACA0012 airfoil oscillating at high reduced frequency. They noticed that the leading edge separation vortices were combined one by one into a vortex near the trailing edge and then shed together downstream into the wake.…”

Section: Introductionmentioning

confidence: 99%

Unsteady flow over flexible wings at different low Reynolds numbers

Genç

Özden

Açıkel

et al. 2016

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. In this study, unsteady flow around flexible membrane wing which had aspect ratio of 1 (AR=1) was investigated experimentally at various Reynolds numbers (Re = 25000 and Re = 50000). Smoke-wire technique for flow visualization over the flexible membrane wing was utilized in the experiments. Digital Image Correlation system (DIC) was used for measuring deformation of AR = 1 flexible membrane wing. Instantaneous deformation measurements of membrane wing were combined with the flow field measurements. In low aspect ratio flexible membrane wings, unsteadiness includes tip vortices and vortex shedding, and the combination of tip vortices. In these types of wings, complex unsteady deformations occurred due to vortex shedding. The results showed that the increasing angle of attack results in increase of membrane deformation. Moreover, it was concluded that analysis of the instantaneous deformation revealed chordwise and spanwise, modes which were due to the shedding of leading-edge vortices as well as tip vortices. Consequently, vibrational mode decreased and maximum standard deviation location approached to the trailing edge by reason of increasing angle of attack.

show abstract

Section: Introductionmentioning

confidence: 99%

Unsteady flow over flexible wings at different low Reynolds numbers

Genç

Özden

Açıkel

et al. 2016

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

“…The works of Shih and Ho [96] and Kuo and Hsieh [63] have further demonstrated that the diffusive flux of vorticity also plays a significant role in the formation and development of the LEV prior to its detachment. It can therefore be assumed that characterizing the near-wall dynamics of an LEV has the potential to significantly enhance our understanding of its evolution.…”

Section: Objectivementioning

confidence: 97%

“…In a work that was similar to Shih and Ho [96], Kuo and Hsieh [63] studied the trajectory of the LEV formed by a pitching NACA 0012 airfoil. Using a control volume analysis, they characterized the flux of vorticity from the surface of the airfoil at nine different chordwise locations and also reported significant fluxes of vorticity from the surface of the airfoil.…”

Section: Vorticity Transport At Boundariesmentioning

confidence: 99%

“…In accordance with the work of Shih and Ho [96], it was also demonstrated that the detachment of the LEV led to the surface vorticity flux falling to zero. By tracking the core of the LEV, Kuo and Hsieh [63] characterized this drop in the surface vorticity flux as being caused by the LEV moving away from the surface of the airfoil, thereby weakening the interaction between the two.…”

Section: Vorticity Transport At Boundariesmentioning

confidence: 99%

“…For annotation purposes, any portion of ∂A z that lies along the surface of the airfoil will be called S . Ho [96] and Kuo and Hsieh [63] through the use of Laser Doppler Anemometry (LDA).…”

Section: Derivation Of Vorticity Flux Equationmentioning

confidence: 99%

See 2 more Smart Citations