Unsteady fluid-structure interactions of membrane airfoils at low Reynolds numbers

Rojratsirikul, Pinunta; Wang, Z.; Gursul, Ismet

doi:10.1007/978-3-642-11633-9_24

Cited by 32 publications

(68 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The details of the pre-strain e excess length ratio, (L 0 Àc e )/c e m viscosity of air P 1 aeroelastic parameter, (Et/q N c) 1/3 r density of air r m density of membrane set-up are similar to those of the previous work (Rojratsirikul et al, 2008(Rojratsirikul et al, , 2009a. The membrane airfoil was placed in the test-section by means of a frame and end plates as shown in Fig.…”

Section: Modelsmentioning

confidence: 99%

“…The aeroelastic parameter used by Smith and Shyy (1996) has values of P 1 = 5.77, 4.41, and 3.64 based on U N =5, 7.5, and 10 m/s, respectively. In addition, a rigid airfoil made of 1 mm thick steel plate with a shape equivalent to the mean membrane deformation was tested in order to reveal the effects of membrane vibrations (Rojratsirikul et al, 2008(Rojratsirikul et al, , 2009a.…”

Section: Modelsmentioning

confidence: 99%

“…Unsteady fluid-structure interactions of membrane airfoils at low Reynolds numbers have been recently studied experimentally (Rojratsirikul et al, 2008(Rojratsirikul et al, , 2009a and computationally (Gordnier, 2008;Gordnier and Attar, 2009;Matthews et al, 2008). In our previous study (Rojratsirikul et al, 2009a) we investigated two-dimensional flexible membrane airfoils with zero pre-tension with particular emphasis on the unsteady aspects of the fluid-structure interaction at low Reynolds numbers.…”

Section: Introductionmentioning

confidence: 98%

“…In our previous study (Rojratsirikul et al, 2009a) we investigated two-dimensional flexible membrane airfoils with zero pre-tension with particular emphasis on the unsteady aspects of the fluid-structure interaction at low Reynolds numbers. It was found that the amplitude and mode of the membrane vibrations depend mainly on the relative location and magnitude of the unsteadiness of the separated shear layer.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of pre-strain and excess length on unsteady fluid–structure interactions of membrane airfoils

Rojratsirikul

Wang

Gursul

2010

Journal of Fluids and Structures

Self Cite

View full text Add to dashboard Cite

Aerodynamic characteristics of two-dimensional membrane airfoils were experimentally investigated in a wind tunnel. The effects of the membrane pre-strain and excess length on the unsteady aspects of the fluid-structure interaction were studied. The deformation of the membrane as a function of angle of attack and free-stream velocity was measured using a high-speed camera. These measurements were complemented by the measurements of unsteady velocity field with a high frame-rate Particle Image Velocimetry (PIV) system as well as smoke visualization. Membrane airfoils with excess length exhibit higher vibration modes, earlier roll-up of vortices, and smaller separated flow regions, whereas the membranes with pre-strain generally behave more similarly to a rigid airfoil. Measured frequencies of the membrane vibrations suggest a possible coupling with the wake instabilities at high incidences for all airfoils.

show abstract

Section: Modelsmentioning

confidence: 99%

Section: Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of pre-strain and excess length on unsteady fluid–structure interactions of membrane airfoils

Rojratsirikul

Wang

Gursul

2010

Journal of Fluids and Structures

Self Cite

View full text Add to dashboard Cite

show abstract

“…Additionally, moderate cambering improves wing aerodynamic efficiency [4,5]. Wing flexibility has also shown to be advantageous in terms of delaying stall, increasing lift and providing gust alleviation [6][7][8][9][10][11]. Most flexible fixed-wing examples incorporate a membrane, often silicon rubber or similar material, adhered to a more rigid framework such as carbon fiber or aluminum.…”

Section: Introductionmentioning

confidence: 99%

On the streamwise and normal vortices forming on plates with spanwise periodic cambering

Wahidi

Hubner

Ölçmen

2016

Aerospace Science and Technology

View full text Add to dashboard Cite

Please cite this article in press as: R. Wahidi et al., On the streamwise and normal vortices forming on plates with spanwise periodic cambering, Aerosp. Sci. Technol. (2016), http://dx. ABSTRACTThree-dimensional measurements of the flow field over rigid plates with periodic cambering in the spanwise direction were performed. Two plates of an aspect ratio of 5 with 5 and 9 periodic cells were used, and measurements were performed at a Reynolds number of 28,000 and three angles of attack. Previous research showed that organized streamwise and normal vortices form in the valleys between the periodic cells, and that these vortices contribute to slight enhancement of lift and reduction in drag. In this investigation, the details of these vortices are examined and compared at three different flow fields including: 1) short separation bubble, 2) long separation bubble and 3) fully separated flow. The formation of these primary vortices is observed in all cases. This investigation also discusses the formation of these vortices to provide further insight to the flow physics of these vortices. The formation of these vortices is influenced by the interaction between the periodic cambering and the thickness and strength of the backflow. This interaction becomes strongest when a long separation bubble forms resulting in larger vortices in size and magnitude. The instantaneous flow field shows that the primary vortices form most of the time, while they move in the spanwise direction and breakdown in the streamwise direction at other instances of time. In addition to the primary vortices, smaller streamwise and normal vortices also form. Proper Orthogonal Decomposition results indicate that reconstructing the flow field with different number of modes isolates the primary vortices from the smaller scale vortices.

show abstract

Structured-light-based surface measuring for application in fluid–structure interaction

Hoerner

Bonamy

2019

Exp Fluids

View full text Add to dashboard Cite

Unsteady fluid-structure interactions of membrane airfoils at low Reynolds numbers

Cited by 32 publications

References 0 publications

Effect of pre-strain and excess length on unsteady fluid–structure interactions of membrane airfoils

Effect of pre-strain and excess length on unsteady fluid–structure interactions of membrane airfoils

On the streamwise and normal vortices forming on plates with spanwise periodic cambering

Structured-light-based surface measuring for application in fluid–structure interaction

Contact Info

Product

Resources

About