Experimental Investigation of Flow Control over an Ahmed Body using DBD
                        Plasma Actuator

Shadmani, S.; Nainiyan, S. M. Mousavi; Mirzaei, Mehran; Ghasemiasl, Ramin; Pouryoussefi, Sohrab Gholamhosein

doi:10.29252/jafm.11.05.28600

Cited by 15 publications

(13 citation statements)

References 35 publications

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“…In particular, many studies focusing on improvement of wing performance by suppressing the flow separation (Sato et al, 2015;Fujii, 2018) have been conducted in the aerospace field. Regarding applications of PA on automobile flow, aerodynamic noise reduction (Miyamoto et al, 2018) and aerodynamic drag reduction (Shadmani et al, 2018;Kanatani et al, 2009;Vernet et al, 2018) have been studied. These studies aimed to reduce the boundary layer separation from the automobile's body, such as at the roof's end or the rounded pillar, similar to suppressing flow separation on a wing.…”

Section: Aerodynamic Drag Reduction Of a Simplified Vehicle Model By mentioning

confidence: 99%

Aerodynamic drag reduction of a simplified vehicle model by promoting flow separation using plasma actuator

Shimizu

Nakashima

Sekimoto

et al. 2019

Mechanical Engineering Letters

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In recent years, the dielectric barrier discharge plasma actuator (DBD-PA), which is a fluid control device, has been investigated for achieving both high aerodynamic performance and pleasing styling of transportation equipment. In this study, the authors installed a DBD-PA system on a simplified three-dimensional bluff automobile body to reduce the aerodynamic drag. In particular, the authors focused on the sides of the rear end of the body, where the local shape has high sensitivity regarding both styling and aerodynamic drag. At the rear sides of the automobile-like bluff body, a sharp edge rather than a smooth rounded corner often reduces the aerodynamic drag by promoting airflow separation. Therefore, the authors aimed to reduce the aerodynamic drag by using a DBD-PA system to promote flow separation at the rear end while retaining its rounded shape. Aerodynamic measurements using a one-fifth scale simplified automobile model were conducted in a wind tunnel. Preliminary investigation of the aerodynamic effect at the rear clarified how the longitudinal vortices from the rear pillar and the side edge of the trunk deck cause the drag increase at the rear-end corners. Two parallel DBD-PAs were installed on the rear surface to shift these vortices away from the corners by promoting flow separation. The drag reduction rate reached 3% at the highest applied voltage using the DBD-PA system on a rounded shape, and it achieved approximately half the effect of the sharp-edged shape. The longitudinal vortices were successfully kept away from the rear-end corners by the DBD-PAs. The surface pressure increased with the displacement of the vortices, which led to the drag reduction observed.

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Section: Aerodynamic Drag Reduction Of a Simplified Vehicle Model By mentioning

confidence: 99%

Aerodynamic drag reduction of a simplified vehicle model by promoting flow separation using plasma actuator

Shimizu

Nakashima

Sekimoto

et al. 2019

Mechanical Engineering Letters

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“…This position was labeled "Position 1" in this paper. Shadmani [27] realized a good control effect by placing the upper electrode of an actuator at the end of the top surface, i.e., "Position 2" in this paper. However, the conditions for the two groups of tests differed, and thus, no effective comparison could be made.…”

Section: Control Effect Under Different Positions Of the Actuatormentioning

confidence: 90%

“…The maximum drag reduction of 8% at a 10 m/s wind speed was achieved when an actuator was arranged on top of the slanted surface. Shadmani [27] used the steady and unsteady excitation of a plasma actuator to reduce the drag of an Ahmed model (rear slant angle of 25 • ) and found that drag reduction was better with the former than with the latter. The Ahmed body [28] is a simplified geometry of automobiles with different tail characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…The present work conducted further experimental research on an Ahmed body (rear slant angle of 25 • ) to comprehensively explore the mechanism and regulation of flow control based on the research of Boucinha [26] and Shadmani [27]. First, the optimal excitation voltage and the maximum induced wind speed were obtained by studying the aerodynamic characteristics of ionic wind under different excitation voltages V pp (peak-to-peak voltage) through a quiescent flow test.…”

Section: Introductionmentioning

confidence: 99%

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Separation Flow Control of a Generic Ground Vehicle Using an SDBD Plasma Actuator

Zheng

Guo

et al. 2019

Energies

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Quiescent flow and wind tunnel tests were performed to gain additional physical insights into flow control for automotive aerodynamics using surface dielectric barrier discharge plasma actuators. First, the aerodynamic characteristics of ionic wind were studied, and a maximum induced velocity of 3.3 m/s was achieved at an excitation voltage of 17 kV. Then, the optimal installation position of the actuator and the influence of the excitation voltage on flow control at different wind speeds were studied. The conclusions drawn are as follows. The effect of flow control is better when the upper electrode of the actuator is placed at the end of the top surface, increasing the likelihood of the plasma generation region approaching the natural separation location. The pressure on top of the slanted surface is primarily affected by airflow acceleration at a low excitation voltage and by the decrease of the separation zone at a high excitation voltage. The maximum drag reduction can be realized when the maximum velocity of ionic wind reaches 1.71 m/s at a wind speed of 10 m/s and 2.54 m/s at a wind speed of 15 m/s. Moreover, effective drag reduction can be achieved only by continuing to optimize the actuator to generate considerable thrust at a high wind speed.

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“…Comparing the control effects of linear and serpentine plasma actuators on the rear flow field of the tractor-trailer truck by Roy et al [33], it was found that the former fails to reduce the drag, while the latter has a big change in the drag, and obtained the drag drops by more than 14% and 10% at an inflow velocity of 26.8 and 31.3 m/s. At the same time, some researchers use plasma actuators to control the airflow separation on the rear window of the Ahmed model, so as to achieve the purpose of reducing drag [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Drag Reduction and Optimization of MIRA Model Based on Plasma Actuator

Lai

Can

et al. 2020

Actuators

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Active flow control of surface dielectric barrier discharge (SDBD) plasma is a technology that converts electrical energy into kinetic energy to achieve flow control. Its main application areas are concentrated in the aviation field. Undoubtedly, few studies have applied it in the field of automobile flow control. Meanwhile, during high-speed driving, there is a serious airflow separation phenomenon at the rear of notch-back cars, which brings a large area of negative pressure to the back of the cars. Due to the huge pressure difference between the front and end of the cars, it will increase the driving drag and fuel cost of the car. In this context, we seek to discuss the control effect on the airflow separation at the rear of the notch-back by using the phenomenological numerical simulation method of plasma flow control. Firstly, the plasma actuator is arranged separately on the rear end of the roof, c-pillar, upper and side of the trunk to study the control effect of airflow separation. After that, the plasma actuators at each position are combined and actuated simultaneously. We try to observe the control effect of airflow separation and select the combination with the best drag reduction effect. In the third stage, an efficient global optimization (EGO) algorithm based on kriging response surface is applied to optimize the supply voltage of the best combination that has been obtained before and obtain the driving voltage parameter of each actuator optimized under this combination. The results show that when plasma actuation is applied at four locations, only the actuation applied to the side of the luggage compartment has a significant drag reduction effect, while in other cases, the drag coefficient will increase. Specifically, drag reduction is better when the actuation is applied at four positions simultaneously. The maximum drag reduction coefficient of the car is reduced by 13.17%.

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Experimental Investigation of Flow Control over an Ahmed Body using DBD Plasma Actuator

Cited by 15 publications

References 35 publications

Aerodynamic drag reduction of a simplified vehicle model by promoting flow separation using plasma actuator

Aerodynamic drag reduction of a simplified vehicle model by promoting flow separation using plasma actuator

Separation Flow Control of a Generic Ground Vehicle Using an SDBD Plasma Actuator

Aerodynamic Drag Reduction and Optimization of MIRA Model Based on Plasma Actuator

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