Letter
Engineering, Mechanical
Rasool Kayvanpour, Sahar Noori, Peiman Sepahvand
Summary: This study investigates the impact of DBD plasma actuators on the flow over a pitching NACA 0012 airfoil. The effects of the plasma actuator on aerodynamic coefficients and dynamic stall are analyzed. The optimal location and variations in voltage and frequency are also explored. The accuracy of the results is validated against numerical and experimental data.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Dongsheng Zhang, Hua Liang, Hesen Yang, Zhi Su, Chuanbiao Zhang, Shimin Liu
Summary: Installing surface dielectric barrier discharge (NS-DBD) in the nacelle inlet can effectively reduce flow separation and improve intake quality. The experimental results show that NS-DBD has better flow control effect than alternating current dielectric barrier discharge (AC-DBD). NS-DBD mainly achieves flow control through shock waves and induced vortices, while AC-DBD mainly reduces inverse pressure gradient by inducing near-wall jets to improve nacelle flow separation.
Article
Thermodynamics
Haocheng Yu, Jianguo Zheng
Summary: A detailed investigation of flow separation control over a stalled NACA 0015 airfoil model using pulsed nanosecond dielectric barrier discharge (NS-DBD) plasma actuator is conducted through combined large eddy simulation (LES), dynamic mode decomposition (DMD) and experimental particle image velocimetry (PIV) measurement. The interplay of residual heat due to the nanosecond plasma discharge with external flow leads to the generation of vortices and the formation of large-scale vortical structures. The flow control mechanisms depend on the forcing frequencies of plasma actuation and are categorized into three types. The optimum forcing frequency is identified based on DMD analysis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Aerospace
Maria Grazia De Giorgi, Valentina Motta, Antonio Suma, Alessia Lafori
Summary: This paper investigates the effects of DBD plasma actuators on aeroelastic control of a subsonic compressor cascade, demonstrating that the phase of actuation force can effectively manipulate unsteady lift and moment coefficients, stabilize compressor performance, alleviate fatigue phenomena, and enlarge flutter limits. The study suggests that plasma actuators are a very promising technology for active flow control in turbomachines and aeronautical applications.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Yizhou Wang, Haideng Zhang, Yun Wu, Yinghong Li, Yifei Zhu
Summary: This study investigates the flow control effects of three types of nanosecond (NS) dielectric barrier discharge (DBD) plasma actuations in suppressing the flow separation of a compressor airfoil at low Reynolds number using large-eddy simulation. It is found that the NS DBD plasma actuation can effectively suppress the flow separation by inducing distorted flow structure (DFS) within the flowfield and improving the momentum of the laminar boundary layer. The results provide insights into the mechanisms behind the flow control effect.
Article
Engineering, Aerospace
Jianyang Yu, Yuhang Lu, Yabo Wang, Fu Chen, Yanping Song
Summary: This paper experimentally studies the effects of dielectric barrier discharge (DBD) plasma actuators (PAs) on the leakage flow structures and loss in a turbine cascade. The results show that the DBD plasma actuators can weaken the strength of the tip leakage flow near the casing, and this effect is influenced by the actuation strength and attack angle.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Oleg Vishnyakov, Pavel Polivanov, Andrey Sidorenko
Summary: The paper investigates unsteady effects in shock wave/boundary layer interactions by using a flat plate model subjected to certain flow conditions. The results showed that disturbances in the frequency range of 500 to 1700 Hz mostly decay, with maximum amplitudes observed at frequencies of 1250 Hz and 1700 Hz.
Article
Physics, Multidisciplinary
Jian-Guo Zheng
Summary: This study investigates flow separation control over NACA 0015 airfoil using continuous alternating current (AC) dielectric barrier discharge (DBD) plasma actuator experimentally and numerically. It is found that the response of external flow to plasma forcing is delayed and the delay time increases with angle of attack increasing, while at high post-stall angle of attack, the flow field can recover to the massively separated flow state and then reattach to airfoil surface with the flow pattern fluctuating irregularly.
Article
Mechanics
Yang Zhang, Yunlong Zhao
Summary: The objective of this research is to study the efficacy of Magnus effect on a circulation control airfoil (CCA). The flow around a three-dimensional CCA configuration is numerically simulated using the Reynolds-averaged Navier-Stokes method. The analysis focuses on lift-drag forces, velocity circulation, and flow separation. The findings show that clockwise rotation enhances the aerodynamic performance of the airfoil by shifting the separation and stagnation points backward, while counterclockwise rotation has an opposing effect. Both clockwise and counterclockwise rotation suppresses the fluctuating aerodynamic force coefficients, resulting in a stable flow pattern with vortices near the trailing-edge area.
Article
Engineering, Mechanical
Zongnan Chen, Chih-Yung Wen
Summary: The experimental study investigates the control performance of different types of plasma actuators on reducing bluff body flow separation, vortex-induced vibration, and wake fluctuation. The results show that the hybrid actuator achieves the best performance by enhancing mixing through improved three-dimensional flow structures on the bluff body surface, reducing drag and lift oscillations.
JOURNAL OF FLUIDS AND STRUCTURES
(2021)
Article
Engineering, Aerospace
Roozbeh Aslani, Michael Krieger, Philipp Gittler
Summary: The control mechanism of a nanosecond dielectric barrier discharge (NS-DBD) actuator for suppressing laminar separation on airfoils was investigated using two-dimensional scale-adaptive simulations. The focus of the investigation lies in the study of vortex formation and evolution induced by the actuator. High grid resolution in the boundary layer allowed a detailed investigation of the vortex formation process, revealing that vortices are generated by baroclinic torque and vortex dilatation and not by a Kelvin-Helmholtz instability.
Article
Engineering, Aerospace
Zhikun Sun, Zhiwei Shi, Weilin Zhang, Qijie Sun, Quanbing Sun, Zheng Li
Summary: This study investigates the effects of the geometric position of a plasma synthetic jet (PSJ) actuator on an airfoil surface for flow control. The study shows that the position of the PSJ actuator is a key factor in determining the flow control effects. The concept of distance l placement provides a reference for determining the geometric arrangement of the PSJ actuator. The study also suggests that directly increasing lift is a new option for improving the lift-drag characteristics of an airfoil.
JOURNAL OF AEROSPACE ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Musavir Bashir, Nicola Zonzini, Ruxandra Mihaela Botez, Alessandro Ceruti, Tony Wong
Summary: This paper investigates the effect of the Dynamically Morphing Leading Edge (DMLE) on the flow structure and the behavior of dynamic stall vortices around a pitching UAS-S45 airfoil. The study develops a framework to model the time-varying motion of the leading edge and integrates it into the numerical solver. The results show that the DMLE airfoil increases the lift coefficient and delays the dynamic stall angle.
Article
Physics, Applied
Huw Borradaile, Konstantinos Kourtzanidis, Francois Rogier, Kwing-So Choi, Xuerui Mao
Summary: The study shows that the reversal of flow direction in millimetric annular dielectric barrier discharge (DBD) plasma actuators is induced by disproportionate reduction of the negative radial electrohydrodynamic forcing component during the positive sub-cycle. Factors influencing this flow reversal include the thickness of the electrode and the ambient oxygen content via similar discharging mechanisms.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Mathematics, Applied
Manuel Nunez
Summary: Introducing a magnetic field into the plate generates a perturbation that can be expressed in terms of an Abel transform for lift calculation. Inverting the Abel transform allows for achieving any desired lift distribution on the plate.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2022)
Article
Engineering, Chemical
C. A. Shi, A. Martynenko, T. Kudra, P. Wells, K. Adamiak, G. S. P. Castle
JOURNAL OF FOOD ENGINEERING
(2017)
Article
Engineering, Electrical & Electronic
Zhuangbo Feng, Zhengwei Long, Shiqi Cao, Kazimierz Adamiak
JOURNAL OF ELECTROSTATICS
(2018)
Article
Physics, Applied
C. A. Shi, K. Adamiak, G. S. P. Castle
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2018)
Article
Engineering, Electrical & Electronic
Mohammadreza Ghazanchaei, Kazimierz Adamiak, G. S. Peter Castle
JOURNAL OF ELECTROSTATICS
(2014)
Article
Engineering, Electrical & Electronic
Kazimierz Adamiak
JOURNAL OF ELECTROSTATICS
(2020)
Article
Physics, Fluids & Plasmas
Kazimierz Adamiak
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2020)
Article
Engineering, Multidisciplinary
Afshin Shaygani, Kazimierz Adamiak
Summary: The effect of surface conductivity on the electrical and mechanical characteristics of the surface dielectric barrier discharge actuator has been investigated numerically. The study shows that the dielectric surface conductivity plays a significant role in the discharge behavior and flow field.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2022)
Review
Engineering, Electrical & Electronic
Navid Zehtabiyan-Rezaie, Kazimierz Adamiak, Majid Saffar-Avval
Summary: Impressive progress has been made in enhancing evaporation from liquid surfaces due to electrohydrodynamic flow, particularly through numerical simulations, over the past two decades. Sharp electrodes placed over the liquid surface have been observed to increase evaporation rate. Different water models have been proposed in numerical simulations, with conducting models being the physically correct ones.
JOURNAL OF ELECTROSTATICS
(2021)
Article
Engineering, Aerospace
Kazimierz Adamiak
Summary: The algorithm utilizes a three-species fluid model and implements two approximate models for photoionization, with the accuracy of the model validated by comparing with experimental data.
Article
Nanoscience & Nanotechnology
Qingqing Gao, Xiaohua Wang, Kazimierz Adamiak, Xiangcheng Qi, Aijun Yang, Dingxin Liu, Chunping Niu, Jiawei Zhang
Summary: The discharge mechanism of C4F7N-CO2 and C4F7N-N-2 mixtures in corona discharge is investigated using a fluid model. The results show that C4F7N-CO2 mixtures have larger suppression regions and higher numbers of electrons, positive ions, and negative ions compared to C4F7N-N-2 mixtures, but the reduced electric field is smaller.
Article
Physics, Applied
Afshin Shaygani, Kazimierz Adamiak
Summary: A numerical algorithm is proposed to simulate the dielectric barrier discharge plasma actuators with photo-ionization. By suppressing the discharge pulses and proposing a mean discharge model, the computational bottleneck related to long computing time is circumvented. The model, based on fluid description of electrons, positive and negative ions, takes into account drift, diffusion, and reaction terms. The accuracy of the proposed methodology is validated by comparing computational and experimental data.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Applied
Afshin Shaygani, Kazimierz Adamiak
Summary: This work compares different numerical modeling approaches for non-equilibrium gas discharge plasmas in dry ambient air at atmospheric conditions, specifically Trichel pulse discharge. The simulation models utilize a 2D axisymmetric finite element discretization of point-plane geometry, and consider negative corona discharge and hydrodynamic approximation for ionic species. The models include drift, diffusion, and reactions of the species, with continuity equations coupled to Poisson's equation for the electric field. Three different formulations for ionic reaction rate coefficients were used, and the effect of gas flow and heating on pulse characteristics was investigated. The accuracy of the models was validated against experimental data.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Qingqing Gao, Xiaohua Wang, Kazimierz Adamiak, Aijun Yang, Dingxin Liu, Mingzhe Rong, Jiawei Zhang
PHYSICS OF PLASMAS
(2020)
Article
Physics, Fluids & Plasmas
Qingqing Gao, Chunping Niu, Kazimierz Adamiak, Aijun Yang, Mingzhe Rong, Xiaohua Wang
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2018)