Aerodynamic characteristics of unsymmetrical aerofoil at various turbulence intensities

Arunvinthan, S.; Pillai, S. Nadaraja

doi:10.1016/j.cja.2019.05.014

Cited by 14 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The coefficient of lift (C L ) and coefficient of drag (C D ) could be obtained from the F L and F D using the free stream dynamic pressure and the planform area of the test airfoil [48][49][50][51]. The coefficient of lift (C L ) and coefficient of drag (C D ) were calculated as illustrated in [52] by the following formulae:…”

Section: Experimental Methodologymentioning

confidence: 99%

Aerodynamic Characteristics of Shark Scale-Based Vortex Generators upon Symmetrical Airfoil

et al. 2021

Self Cite

View full text Add to dashboard Cite

A series of wind tunnel tests were carried out to determine the effect of shark scale-based vortex generators (SSVG) on a NACA 0015 symmetrical airfoil's aerodynamic characteristics. Three different sets of SSVG with varying geometrical parameters, such as chord length, amplitude, and wavelength, were designed and fabricated using 3D printing. The SSVG models were blended to the baseline NACA 0015 symmetrical airfoil. The wind tunnel experiments were performed over the test airfoil mounted with different sets of SSVG at various angles of attack, ranging from 0° to 24° in increments of 3°, and operating in the range of Re = 2 × 105. The results revealed that the SSVG blended test airfoil reduced the drag and increased the maximum coefficient of lift (CLmax), thereby enhancing the overall aerodynamic performance. The SSVG offered noteworthy aerodynamic benefits by effectively altering the flow and causing significant spanwise variation in the flow properties. Additionally, attempts were made to identify the optimum chordwise location to blend the SSVG for effective use.

show abstract

Section: Experimental Methodologymentioning

confidence: 99%

Aerodynamic Characteristics of Shark Scale-Based Vortex Generators upon Symmetrical Airfoil

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…It can also be seen that, by increasing the turbulence intensity, it is possible to delay the stall angle. Arunvinthan et al [8] performed experiments on an asymmetric airfoil against inflows of five different Re c ranging from 1.09×10 5 to 3.01×10 5 and studied its aerodynamic loads at various turbulence intensities. They found that the lift coefficient increases with increasing turbulence intensity.…”

Section: Introductionmentioning

confidence: 99%

Wind tunnel study: is turbulent intensity a good candidate to help in bypassing low Reynolds number effects on 2d blade sections?

Mishra

Neunaber

Guilmineau

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Wind turbines operate in the turbulent atmospheric boundary layer and can be additionally exposed to the wakes of upstream wind turbines. Hence the inflow encountered by wind turbine rotor blades is turbulent. One way to gain more knowledge on the impact of the turbulence on the airfoil aerodynamics is by studying a 2d airfoil section of a real wind turbine blade against inflows of various turbulence intensities and Reynolds numbers. Therefore, for the purpose of this paper, experiments were performed and aerodynamic coefficients were calculated for chord based Reynolds numbers between 1.3 × 105 and 3 × 105 and angles of attack between -10° and 24° for inflows of three different averaged turbulence intensities, 0.3%, 3% and 5.5%. Results were compared with the already available result of measurements done at a higher chord based Reynolds number of 4.7×106 for the same airfoil type. The results show that, for a given Reynolds number, an increase in turbulence intensity suppresses the flow separation. It was also found that an increase in the turbulence intensity of the inflow does reduce the dependence of aerodynamic coefficients on the Reynolds number. The Comparison between experimental results for lower chord-based Reynolds numbers and high chord-based Reynolds numbers shows differences which implies that an increase of the turbulence intensity is not enough to bypass the low Reynolds number effect completely.

show abstract

“…Some of them focus on investigating the general evolution of turbulence in turbomachines [11,29,47]. While others explore the structure of the flow directly around airfoils [17,27,30,42,48]. Usually, the goal of these studies is to identify the influence of the angle of attack on the turbulence evolution and wake topology.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of turbulent flow behind an asymmetric airfoil

et al. 2021

View full text Add to dashboard Cite

Feature of turbulent flow anisotropy behavior behind an asymmetric NACA 64-618 airfoil investigated in this paper. Experimental studies were performed using a hot-wire anemometery with X-probe at the chord-based Reynolds number $$1.7 \times 10^5$$ 1.7 × 10 5 . The average ensemble velocity and Reynolds stress components are used to determine the wake topology and anisotropy of turbulence. The obtained data allowed to identify the outside wake region, which is characterized by low instability and a high degree of anisotropy of the turbulent flow. This tendency is observed at different angles incident. Further, to gain better insight into the physics of this phenomenon the structure of turbulence have been evaluated. Integral turbulence length and time scales were estimated by the area of the autocorrelation function of velocity fluctuations. Then, using the second-order structural function, we obtained the dissipation characteristics of the flow. In addition, the features of the energy spectrum in the region with high and low degrees of turbulence anisotropy were analyzed.

show abstract

Aerodynamic characteristics of unsymmetrical aerofoil at various turbulence intensities

Cited by 14 publications

References 23 publications

Aerodynamic Characteristics of Shark Scale-Based Vortex Generators upon Symmetrical Airfoil

Aerodynamic Characteristics of Shark Scale-Based Vortex Generators upon Symmetrical Airfoil

Wind tunnel study: is turbulent intensity a good candidate to help in bypassing low Reynolds number effects on 2d blade sections?

Anisotropy of turbulent flow behind an asymmetric airfoil

Contact Info

Product

Resources

About