Study on the Wake Shape behind a Wing in Ground Effect Using an Unsteady Discrete Vortex Panel Method

Han, Cheolheui; Kinnas, Spyros A.

doi:10.4236/ojfd.2013.34032

Cited by 11 publications

(6 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The torque values were calculated from the difference between balancing weight and the values shown in digital balance (S) by Eq. (3) [19].…”

Section: Wind Turbine Designmentioning

confidence: 99%

Investigation of Rolled-Up Effect of the Forward-Swept 3-D Wind Turbine Blades

Sutrisno¹

2018

IJRET

View full text Add to dashboard Cite

Noiseless aerodynamics of a rotor blade is a vital research objective towards environmentally friendly wind turbine technology and military advancement of helicopter blades. Blade planform of a wind turbine determines the limiting streamline that responsible for the aerodynamic characteristics. This paper focused on the aerodynamic flow visualization showing the flow pattern around forward swept horizontal axis wind turbine (HAWT) for different radius and different wind velocities. The experiments were conducted in a wind tunnel. Tuft patterns were used for flow visualization, and rope brake dynamometer was employed for measuring the performances in different wind speeds. It is found that the planforms can form 3-D folds streamline that show the detailed mechanism of rolling-up effect, and give different performances in the cases of different radius and wind speeds.

show abstract

“…The torque values were calculated from the difference between balancing weight and the values shown in digital balance (S) by Eq. (3) [19].…”

Section: Wind Turbine Designmentioning

confidence: 99%

Investigation of Rolled-Up Effect of the Forward-Swept 3-D Wind Turbine Blades

Sutrisno¹

2018

IJRET

View full text Add to dashboard Cite

show abstract

“…Furthermore, in their following report (Sutrisno et al, 2017), it is realized that stall delays, identified in 3-D wind turbine forward and backward blade models, are due to the effects of the rolled-up vortex generated by delta formed-hubs. The conclusion has been drawn based on several experimental evidences (Gursul, Wang, & Vardaki, 2007) (Nelson & Pelletier, 2003) (Han & Kinnas, 2013). Sutrisno et al (Sutrisno, Rochmat, et al, n.d.) have realized how the strength of vortex core produced by rolled-up vortices should be intensively investigated especially its effect on the farther regions affected.…”

Section: From Stall-delay To Rolled-up Vortex and Vortex Corementioning

confidence: 99%

The Rolled-up and Tip Vortices Studies in the CFD Model of the 3-D Swept-Backward Wind Turbine Blades

Sutrisno

Deendarlianto

Rochmat

et al. 2017

MAS

View full text Add to dashboard Cite

In this paper, the method to analyze of vortex dynamics simulation of 3-D (three dimensional) backward wind turbine blades is introduced, consisted of flow visualization part and detailed measurement part. With this method, one could explain visually and by calculation the role of 3-D flow vortex mechanism patterns on 3-D backward wind turbine blade, the interchange between kinetic and potential energies, the utilization of very strong vortex, which could lose energy, generate lift, and produce tangential mechanical power. The method could be elucidated by analyzing the appearance of rolled-up vortex effect on the 3-D backward wind turbine blades. A sharp pointed backward blade, generally has a weak tip vortex, may generate a second weak vortex center, and appears due to the rolled-up vortex effect, which is quite difficult to identify. The weakness of tip vortex makes the sharp pointed blade more efficient to exchange energy. Blunt backward turbine blades generally have a strong vortex center, a tip vortex; which in the form of a vortex core. Due to the rolled-up vortex effect, it could generate a second weak vortex center that is clearly visible.

show abstract

“…Cai et al, learned the optimization of wing-trunk arrangement to suspend the start of asymmetrical vortex [46,47]. Using CFD, Bangga et al, explained the computational arrangement effect on a correct guess of an HAWT rotor.…”

Section: Introductionmentioning

confidence: 99%

Dimensional Analysis of Power Prediction of a Real-Scale Wind Turbine Based on Wind-Tunnel Torque Measurement of Small-Scaled Models

2018

View full text Add to dashboard Cite

A preliminary study of a horizontal-axis wind turbine (HAWT) design is carried out using a wind tunnel to obtain its aerodynamic characteristics. Utilization of data from the study to develop large-scale wind turbines requires further study. This paper aims to discuss the use of wind turbine data obtained the wind-tunnel measurements to estimate the characteristics of wind turbines that have field size. One should measure the torque of two small-scale turbines inside the wind tunnel. The first small-scale turbine has a radius of 0.14 m, and the radius of the second small turbine is 0.19 m. Torque measurement results from both turbines were analyzed using the Buckingham π theorem to obtain a correlation between torsion and diameter variations. The obtained correlation equation was used to estimate the field measurement of turbine power with a radius of 1.2 m. The resulting correlation equation can be applied to approximate the energy generated by the turbine using the size of the field well in the operating area and the tip-speed ratio (λ) of the turbine design.

show abstract

Study on the Wake Shape behind a Wing in Ground Effect Using an Unsteady Discrete Vortex Panel Method

Cited by 11 publications

References 14 publications

Investigation of Rolled-Up Effect of the Forward-Swept 3-D Wind Turbine Blades

Investigation of Rolled-Up Effect of the Forward-Swept 3-D Wind Turbine Blades

The Rolled-up and Tip Vortices Studies in the CFD Model of the 3-D Swept-Backward Wind Turbine Blades

Dimensional Analysis of Power Prediction of a Real-Scale Wind Turbine Based on Wind-Tunnel Torque Measurement of Small-Scaled Models

Contact Info

Product

Resources

About