Simulations of flow separation control numerically using different plasma actuator models

Abdelraouf, Hatem; Elmekawy, Ahmed M. Nagib; Kassab, Sadek Z.

doi:10.1016/j.aej.2020.06.044

Cited by 17 publications

(7 citation statements)

References 20 publications

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“…Hoparlör diyaframının, hareket genliğinin referans çalışmalarda önerildiği gibi [11,27] Referans çalışma Eyleyici tipi Analiz tipi Re Abdelraouf vd. [22] DBD Plazma Sayısal 10,27  10 5 Vaddi vd. [23] DBD Plazma Deneysel 3,35  10 5 Castaneda vd.…”

Section: Geometrik Parametreler (Geometrical Parameters)unclassified

“…[29] 5,00×10 5 Değişim oranı [(CL,h-CL,r)/CL,r] × 100 , % Abdelraouf vd. [22] 10,27×10 5 10 1,000 0,830 -17,0 Vaddi vd. [23] 3,35×10 5 8 0,940 0,866 -7,9 Castaneda vd.…”

Section: Ağ Yakınsama İndeksi Testi (Grid Convergence Index Test)unclassified

“…Abdelrauf vd. [22] NACA0012 kanat profili üzerinde dielektrik bariyer deşarj (DBD) tipi plazma jet eyleyicinin aktif akış kontrolünü sayısal benzetimle çalışmışlardır. DBD tipi plazma jet eyleyicinin açık durumunda kapalı duruma göre maksimum kaldırma katsayısının %6,1 arttığını, tutunma kaybı açısının da 2° ötelendiğini göstermişlerdir.…”

Section: Giriş (Introduction)unclassified

See 2 more Smart Citations

Computational fluid dynamics study of lift enhancement on a NACA0012 airfoil using a synthetic jet actuator

ÇANLIOĞLU¹,

Kara

2023

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Bu çalışmada, hoparlör tipi sentetik jet eyleyici (SJE) kullanarak iki boyutlu sayısal analizler yapılmıştır. Kanat profilinin aerodinamik özelliklerini geliştirmek için SJE'nin hangi frekans ve jet orifis çapında olması gerektiğinin bulunması amaçlanmıştır. Hesaplamalı akışkanlar dinamiği (HAD) metodu, ANSYS Fluent akış çözücü modülünde, SST k-ω türbülans modeliyle Reynolds ortalamalı Navier-Stokes (RANS) ve daimi olmayan RANS (URANS) denklemlerinde göre kullanılmıştır. Ağ yakınsama indeksi testi HAD analizlerinde ve SJE-kapalı konfigürasyon çalışmasının HAD analizlerinde RANS, diğer tüm analizlerde URANS çözümleri yapılmıştır. Ağ yakınsama indeksi testi sonucunda, düğüm sayısının 34700 olduğu Mesh4 isimli ağ yapısı hem kaldırma hem de direnç katsayısı hesabına göre en uygun ağ yapısı olarak seçilmiştir. Seçilen referans çalışmalara göre farklı açı ve Reynolds sayılarında, 1500’den 2200 Hz’e frekans ve 1 mm’den 3 mm’ye orifis çapı değerlerinde HAD analizleri yapılmış, kaldırma katsayısı SJE-kapalı ve SJE-açık durumlarında kanat profili üzerinde incelenmiştir. Son olarak, SJE tarafından CL ve kaldırma-direnç oranı (CL/CD) iyileştirmesi farklı konfigürasyonlar altında karşılaştırılmıştır. Sonuçlara göre bu katsayılar, düşük ve orta değerlerdeki Reynolds sayılarında etkili bir şekilde artmıştır.

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Section: Geometrik Parametreler (Geometrical Parameters)unclassified

“…[29] 5,00×10 5 Değişim oranı [(CL,h-CL,r)/CL,r] × 100 , % Abdelraouf vd. [22] 10,27×10 5 10 1,000 0,830 -17,0 Vaddi vd. [23] 3,35×10 5 8 0,940 0,866 -7,9 Castaneda vd.…”

Section: Ağ Yakınsama İndeksi Testi (Grid Convergence Index Test)unclassified

Section: Giriş (Introduction)unclassified

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Computational fluid dynamics study of lift enhancement on a NACA0012 airfoil using a synthetic jet actuator

ÇANLIOĞLU¹,

Kara

2023

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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“…Plasma actuators have been extensively integrated into active flow control. Abdelraouf et al (2020) and Wang et al (2017) demonstrated the efficacy of plasma actuators in modulating separation flow in aerofoils through simulations and empirical methodologies. Their research underscored that embedding plasma actuators in flow separation zones augmented the maximum lift coefficient and postponed the stall angle of attack.…”

Section: Introductionmentioning

confidence: 99%

Optimizing electrode arrangement in plasma actuators: a study on induced velocity and efficiency

Zhou,

Yousif,

Zhang

et al. 2024

Fluid Dyn. Res.

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This study investigates the performance of two types of multi-encapsulated electrode (MEE) plasma actuators, compared to a typical dielectric barrier discharge (DBD) plasma, in quiescent air. Our objective is to determine whether the multiple encapsulated structures can enhance the performance of the plasma actuator. We analyse the flow field using particle image velocimetry (PIV) and schlieren visualisation and calculate the distribution of body force over the gas volume based on the Navier–Stokes equations from velocity measurements. Our findings demonstrate that the starting vortex behaviour is influenced by electrode arrangement. Specifically, we observe that when the first encapsulated electrode is positioned closer to the exposed electrode, then a significantly higher induced velocity can be obtained compared to the baseline condition. In fact, the induced velocity can be increased by up to 1.5 times under this optimise configuration. These results highlight the importance of electrode arrangement in the plasma actuator design. Based on our body force estimation, we find that MEE plasma actuators exhibite a significantly higher momentum transfer, particularly in the wall normal direction. Our investigation on the mechanical efficiency also reveals that the optimised configuration proposed in the present study can significantly enhance the efficiency. In fact, we observe a four-fold increase in maximum efficiency compared to the typical configuration. These results suggest that the proposed configuration could be a promising solution for improving the mechanical efficiency of plasma actuators.

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“…Several studies and application of these devices for active flow control have been reported, including numerical studies such as modeling the induced body force, 4 comparison of the flow control ability under steady and unsteady modes of actuation, 5 drag reduction on an Ahmed body via single DBD implementation at different positions, 6 flow separation control on air foils by different DBD plasma actuator models, 7 simulation of coupled plasma and fluid flow physics of DBD, 8 2D simulation of DBD plasma actuator for the design of an experimental setup to test the flow control on a Coanda surface, 9 among others. Further, experimental studies have been presented reporting on the implementation of DBD actuators for active flow control, such as single plasma actuator excited by two simultaneous sinusoidal voltage waveforms for both steady and unsteady modes, 10 the improvement of the stall speed on a small unmanned aerial vehicle, UAV, 11 the decrease of cross flow velocity in the boundary layer and attenuation of stationary vortex intensity by the effect of multi discharge actuation system, 12 increasing of lift coefficient and drag reduction of a delta wing by using a multi‐DBD plasma actuator, 13 the drag reduction, dispersion of longitudinal vortices and suppression of the separation flow on the rear part of an Ahmed body, 14 in addition to others.…”

Section: Introductionmentioning

confidence: 99%

Improved performance of polyimide Cirlex‐based dielectric barrier discharge plasma actuators for flow control

Nunes-Pereira

Rodrigues

Abdollahzadeh

et al. 2021

Polymers for Advanced Techs

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Dielectric barrier discharge (DBD) plasma actuators are simple electrohydrodynamic devices, which are able to provide effective aerodynamic control. One of the main components of these devices is the thin dielectric layer, which allows to separate and prevent the arc between the high‐voltage electrodes. Different materials can be used as dielectric layer to reduce the power consumption or boost the flow controlling effect of the actuators. In this context, this report presents a comparative study of two commercial polyimides, Kapton and Cirlex, used as dielectric layer of surface DBD plasma actuators. The electrical, dielectric, mechanical, electromechanical, and thermal properties were obtained to evaluate overall performance. It was verified that Cirlex (8.3 W) consumes less power than Kapton (21.3 W) to generate higher induced flow velocity of ≈3.4 m/s for an input voltage of 11 kVpp and 24 kHz. During one AC cycle at 11 kVpp the charge transferred for Cirlex (70 nC) is lower than for Kapton (100 nC), as well as the dielectric breakdown voltage to ignite the plasma discharge, 1.5 and 2.2 kVpp, respectively. The Cirlex DBD presents a higher voltage operation limit (at least 14 kVpp) and a more regular plasma discharge, which results in a more homogenous thermal profile and temperature distribution during its operation. The Cirlex actuator delivered higher mechanical power (6.2 mW) and achieved higher electromechanical efficiency (0.004%). The polyimide Cirlex proved to be a suitable alternative for Kapton to fabricate DBD plasma actuators for flow control with improved performance.

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Simulations of flow separation control numerically using different plasma actuator models

Cited by 17 publications

References 20 publications

Computational fluid dynamics study of lift enhancement on a NACA0012 airfoil using a synthetic jet actuator

Computational fluid dynamics study of lift enhancement on a NACA0012 airfoil using a synthetic jet actuator

Optimizing electrode arrangement in plasma actuators: a study on induced velocity and efficiency

Improved performance of polyimide Cirlex‐based dielectric barrier discharge plasma actuators for flow control

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