Wake Characteristics of Vane-Type Vortex Generators in a Flat Plate Laminar Boundary Layer

Shim, Ho-Joon; Jo, Young-Hee; Chang, Keun Sick; Kwon, Ki-Jung; Park, Seung-O

doi:10.5139/ijass.2015.16.3.325

Cited by 4 publications

(10 citation statements)

References 25 publications

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“…Consequently, the cores of the vortices so generated from rectangular vanes will also be placed relatively higher as well as with more spanwise spacing. Earlier particle image velocimetry studies by Shim et al [49] in incompressible flows on vortex development from triangular, trapezoidal, and rectangular vanes have shown that the vortex generated from a triangular-shaped vane (equivalent to an RV) is much weaker than that generated by a trapezoidal vane, followed by the rectangular vane, which generates the strongest vortex. The vertical position of the vortex core generated from a rectangular vane was also seen to be almost 25% higher than that from a triangular vane [49,50].…”

Section: F Physics Of Flow Developmentmentioning

confidence: 98%

“…No side fences were used on the plate to facilitate schlieren imaging. Control devices of two vane-type configurations, namely triangular or ramped vane (RV) [29,39,40,46,47] and rectangular vane [49,50], were tested to compare the capability of each of these to control the flow interaction. Each of these devices was arranged in the form of an array in a single row.…”

Section: A Wind-tunnel Facility and Model Detailsmentioning

confidence: 99%

“…16b and 16c. At the top edge of the vane (along its span), where the flows from the two sides of each vane meet, the flow accelerates from the pressure side to the suction side over the edge, resulting in roll-up of the flow into vortices [49,50] as it reattaches on the wall. The pressure differential developed on the two sides of the vane depends on the height, length, and shape of the vane.…”

Section: F Physics Of Flow Developmentmentioning

confidence: 99%

“…II.A. The only studies that report such a comparison are by Shim et al [49] and Velte et al [50], but both of these studies have been conducted in the incompressible range (10 m∕s). To the best of the authors' knowledge, such a study in supersonic interactions is unavailable in the literature.…”

mentioning

confidence: 99%

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Control of Incident Shock-Induced Separation Using Vane-Type Vortex-Generating Devices

Verma

Manisankar

2018

AIAA Journal

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An experimental investigation was conducted to control an incident shock-induced boundary-layer separation associated with a 14 deg shock generator in a Mach 2.05 flow. Two vane-type configurations, namely the triangular (h∕δ 0.3, 0.5, 0.8, 1.0) and the rectangular (h∕δ 0.5) designs, were studied. An array of each control device was tested for three control locations of X∕δ 5, 10, and 15. The control location of 5δ is seen to show the maximum reduction in separation length for each device tested. For the rectangular-vane device (h∕δ 0.5), a maximum reduction of 38% in separation length is observed, followed by the triangular-vane devices of h∕δ 0.8 and 1.0, each of which shows a 32% reduction, and finally, h∕δ 0.5 with 18%. The effectiveness of these devices to control separation is, however, seen to decrease with increase in X∕δ. In terms of separation shock unsteadiness, the maximum rms value for X∕δ 5δ shows the highest value for each control device, and this value decreases with increase in control location. At X∕δ 15, both the rectangular vane (h∕δ 0.5) and triangular vane (h∕δ 0.8;1.0) show a 50% reduction in maximum rms value, whereas it decreases to 30% at X∕δ 10 for these devices.

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Section: F Physics Of Flow Developmentmentioning

confidence: 98%

Section: A Wind-tunnel Facility and Model Detailsmentioning

confidence: 99%

Section: F Physics Of Flow Developmentmentioning

confidence: 99%

mentioning

confidence: 99%

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Control of Incident Shock-Induced Separation Using Vane-Type Vortex-Generating Devices

Verma

Manisankar

2018

AIAA Journal

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“…A comprehensive review on low‐profile VGs was presented by Lin . More recent works concerning VVGs were conducted by Godard and Stanislas, Velte et al, or Shim et al, among others.…”

Section: Introductionmentioning

confidence: 99%

Application of rod vortex generators for flow separation reduction on wind turbine rotor

2018

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This paper focuses on flow control on wind turbine blades. A rod vortex generator (RVG) is proposed. Previous experimental and numerical results obtained for channels and blade sections proved RVGs to effectively enhance the streamwise shear stresses and reduce flow separation. The benefits of application of RVGs to control and decrease the flow separation on horizontal axis wind turbine rotor blades are assessed and presented in the paper. The numerical investigation was conducted with the FINE/Turbo solver from Numeca International, which solves the 3D Reynoldsaveraged Navier-Stokes equations. The validation of the numerical model for the clean case is based on phase VI of the Unsteady Aerodynamics Experiment. At selected operating conditions, flow control devices have proven to reattach the flow locally to the wall and improve the aerodynamic performance of the wind turbine. Additionally, the local implementation of RVGs shows strong effect on flow structure and interaction with the main flow to create a "shielding" effect, preventing further penetration of separation towards blade tip. As a consequence, the positive effect of RVGs exists outside the blade span covered by devices. The obtained aerodynamic improvement shows that RVGs may be used as an alternative to traditional flow control devices applied on wind energy turbines. KEYWORDS flow control, flow separation, NREL phase VI, vortex generator, wind energy 1 | INTRODUCTIONSince the industrial revolution, the world demand for energy has grown at a much faster rate than in all previous human history. As a consequence, man's dependency on fossil fuels and green house gasses emissions has risen ever since. In this context, wind energy is seen as one of the most promising solutions to man's ever-increasing demands of a clean source of energy. 1 The main drawback of wind energy compared with nonrenewable energy sources is the cost of energy (COE). The COE may be reduced by increasing the annual energy production (AEP) or decreasing the operation and maintenance cost. This increase of AEP may be achieved through higher availability of the system, thereby reducing the downtime.Nevertheless, the average availability of the onshore horizontal axis wind turbines ranges from 96% to 99%, which indicates slight scope for improvement. 2 The AEP may be also enhanced by increasing wind turbine and rotor sizes. A larger turbine can capture more energy through its lifetime, decreasing the relative COE per megawatt. The last decades development in the material science, control, and aerodynamics have allowed this growth of wind turbines sizes and a continuous reduction in COE. 3 At the end of 1989, a 300-kW wind turbine with 30-m rotor diameter was state of the art; nowadays, turbines with rotor diameters of up to 160 m (Vestas V164-8MW or V164-9.5MW) have been developed, and the current trend of increasing sizes is expected to continue in the future. 4,5 Presence of flow separation on wind turbine blades leads to increased aerodynamic losses, noise generation, and fatigue ...

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Improvement of Defogging Performance of Automobile Defroster using Vortex Generators

et al. 2020

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Wake Characteristics of Vane-Type Vortex Generators in a Flat Plate Laminar Boundary Layer

Cited by 4 publications

References 25 publications

Control of Incident Shock-Induced Separation Using Vane-Type Vortex-Generating Devices

Control of Incident Shock-Induced Separation Using Vane-Type Vortex-Generating Devices

Application of rod vortex generators for flow separation reduction on wind turbine rotor

Improvement of Defogging Performance of Automobile Defroster using Vortex Generators

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