Active control of flow around a circular cylinder by using intermittent DBD plasma actuators

Akbıyık, Hürrem; Akansu, Yahya Erkan; Yavuz, Hakan

doi:10.1016/j.flowmeasinst.2016.12.008

Cited by 20 publications

(5 citation statements)

References 55 publications

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“…Not only these actuators help to reattach the flow on model surfaces but also with momentum transfer they convert the flow type from two dimensional flow to a three dimensional volume flow [4]. Akbıyık et al (2017) reported that intermittent plasma actuators give rise to reduction in drag coefficient of a bluff body and lead to changes in wake width of the bluff body. Two dimensional flow structure around the bluff bodies is converted into a three dimensional flow structure by intermittent plasma actuators [5].…”

Section: Resultsmentioning

confidence: 99%

Optimisation of Wire Electro Discharge Machining Parameter Using Desirability Based Multi Objective RSM While Machining of Al6061–Cenosphere AMCs

Dey¹,

Pandey²,

Das³

2017

Mechanical Engineering

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The aim of SEEP2017 is to bring together the researches within the field of sustainable energy and environmental protection from all over the world.The contributed papers are grouped in 18 sessions in order to provide access to readers out of 300 contributions prepared by authors from 52 countries.We thank the distinguished plenary and keynote speakers and chairs who have kindly consented to participate at this conference. We are also grateful to all the authors for their papers and to all committee members.We believe that scientific results and professional debates shall not only be an incentive for development, but also for making new friendships and possible future scientific development projects. The footprint assessment techniques has provided a set of tools enabling the evaluation of Greenhouse Gas (GHG) -including CO2, emissions and the corresponding effective flows on the world scale. From all such indicators, the energy footprint represents the area of forest that would be required to absorb the GHG emissions resulting from the energy consumption required for a certain activity, excluding the proportion absorbed by the oceans, and the area occupied by hydroelectric dams and reservoirs for hydropower.An overview of the virtual GHG flow trends in the international trade, associating the GHG and water footprints with the consumption of goods and services is performed. Several important indications have been obtained: (a) There are significant GHG gaps between producer's and consumer's emissions -US and EU have high absolute net imports GHG budget. (b) China is an exporting country and increasingly carries a load of GHG emission and virtual water export associated with consumption in the relevant importing countries. (c) International trade can reduce global environmental pressure by redirecting import to products produced with lower intensity of GHG emissions and lower water footprints, or producing them domestically.To develop self-sufficient regions based on more efficient processes by combining neighbouring countries can be a promising development. A future direction should be focused on two main areas: (1) To provide the self-sufficient regions based on more efficient processes by combining production of surrounding countries. (2) To develop the shared mechanism and market share of virtual carbon between trading partners regionally and internationally. HAKAN SERHAD SOYHAN 4 Development in energy sector, technological advancements, production and consumption amounts in the countries and environmental awareness give shape to industry of energy. When the dependency is taken into account in terms of natural resources and energy, there are many risks for countries having no fossil energy sources. Renewable and clean sources of energy and optimal use of these resources minimize environmental impacts, produce minimum secondary wastes and are sustainable based on current and future economic and social societal needs. Sun is one of the main energy sources in recent years. Light and heat of sun are used in...

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Section: Resultsmentioning

confidence: 99%

Optimisation of Wire Electro Discharge Machining Parameter Using Desirability Based Multi Objective RSM While Machining of Al6061–Cenosphere AMCs

Dey¹,

Pandey²,

Das³

2017

Mechanical Engineering

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“…Hürrem Akbıyık 1 -Hakan Yavuz 1,* -Yahya Erkan Akansu 2 convert the flow type from two dimensional (2D) flow structure to a 3D volume flow. Akbıyık et al [7] reported that intermittent plasma actuators give rise to reduction in drag coefficient of a bluff body and lead to changes in wake width of the bluff body. 2D flow structure around the bluff bodies is converted into a 3D flow structure by intermittent plasma actuators [7].…”

Section: A Study On the Plasma Actuator Electrode Geometry Configuratmentioning

confidence: 99%

“…Akbıyık et al [7] reported that intermittent plasma actuators give rise to reduction in drag coefficient of a bluff body and lead to changes in wake width of the bluff body. 2D flow structure around the bluff bodies is converted into a 3D flow structure by intermittent plasma actuators [7]. Bhattacharya and Gregory [8] and [9] reported 3D instabilities in the wake of a circular cylinder by using spanwise segmented plasma actuators.…”

Section: A Study On the Plasma Actuator Electrode Geometry Configuratmentioning

confidence: 99%

A Study on the Plasma Actuator Electrode Geometry Configurations for Improvement of the Aerodynamic Performance of an Airfoil

Akbıyık¹,

Yavuz²,

Akansu³

2018

SV-JME

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In this study, the induced flow effects of plasma generated by various types of electrode geometry configurations are presented. The model chosen for the study is a NACA0015 airfoil. The experiments are conducted in a wind tunnel at Reynolds number of 4.8×10 4. The plasma actuators mounted on the leading edge of the airfoil at chord position of 0.1 (x/C). The plasma actuators consist of an embedded and exposed electrode between which a dielectric material is placed. The applied voltage is set to 7 kV pp. The excitation frequency is also set to 3.5 kHz. Three different electrode geometry configurations, namely as linear, saw-tooth and square, are considered for the study. As a part of the experimental study, the two dimensional and three dimensional flow structures generated by the plasma actuators and related analysis results are presented. In addition, necessary measurements are also made to determine the drag and lift forces. Keywords: NACA0015 airfoil, lift and drag coefficients, square plasma actuator, sawtooth plasma actuator, linear plasma actuator Highlights • The 2D and 3D flow structure generated by the plasma actuators. • The plasma actuator geometry is determined according to the necessary conditions of the aircraft. • The stall angle is shifted by 2 degrees.

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“…The active control methods use energy in order to manipulate the flow. In recent years, the plasma actuators gathered interest as an active flow control method (Akbıyık et al, 2017;Messanelli and Belan, 2017). The plasma actuators consist of two electrodes which are separated by a dielectric material and are placed on the surface of the bluff bodies.…”

Section: Introductionmentioning

confidence: 99%

Effective Flow Control Around a Circular Cylinder by Using Both a Splitter Plate and Plasma Actuators as Passive and Active Control Methods

Akbiyikl

Akansu

2021

Isı Bilimi Ve Tekniği Dergisi

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In this study, passive and active flow control methods were used together to manipulate the flow around a circular cylinder. The experiments were conducted in a wind tunnel for the Reynolds number range of 4000 and 10000 based on the diameter of the circular cylinder (D). A splitter plate was used as passive flow control device and its length was chosen to be about 3.75D. Plasma actuators were placed on the circular cylinder at a position of ±90° as an active flow control device. Combining the active and passive flow control methods, a greater reduction of the drag coefficient was achieved compared to that of the cases when using these methods separately. For Reynolds numbers of 5000 and 10000, the hybrid method gives a reduction in drag of 48% and 45%, respectively. The velocity measurements were carried out by using the hot-wire anemometry and velocity profiles were obtained in the wake region. The flow was visualized by using a smoke wire method. The results revealed that the wake region of the circular cylinder with plasma actuator and splitter plate has a narrower width than the plain cylinder and with splitter plate. Also, it can be seen from spectral analysis that the vortex shedding frequency was suppressed significantly by usage of the hybrid flow control method was used.

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Active control of flow around a circular cylinder by using intermittent DBD plasma actuators

Cited by 20 publications

References 55 publications

Optimisation of Wire Electro Discharge Machining Parameter Using Desirability Based Multi Objective RSM While Machining of Al6061–Cenosphere AMCs

Optimisation of Wire Electro Discharge Machining Parameter Using Desirability Based Multi Objective RSM While Machining of Al6061–Cenosphere AMCs

A Study on the Plasma Actuator Electrode Geometry Configurations for Improvement of the Aerodynamic Performance of an Airfoil

Effective Flow Control Around a Circular Cylinder by Using Both a Splitter Plate and Plasma Actuators as Passive and Active Control Methods

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