Experimental study of separation bubble control behind a backward-facing step using plasma actuators

Pouryoussefi, Sohrab Gholamhosein; Mirzaei, Mehran; Hajipour, Majid

doi:10.1007/s00707-014-1245-7

Cited by 40 publications

(13 citation statements)

References 17 publications

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“…In this situation, due to high conductivity, plasma is discharged at the higher density, reducing plasma density outside the region. This eventually leads to the reduction of induced velocity and this reduces actuator body force (Pouryoussefi et al 2015;Dalvand et al 2018).…”

Section: Quiescent Flow Testmentioning

confidence: 99%

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

Shadmani

Nainiyan

Mirzaei

et al. 2018

JAFM

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Ahmed body is a standard configuration of road vehicles and most of the studies of automobile aerodynamics are performed based on it. In this paper, the plasma actuator was used as an active flow control method to control the flow around the rear part of the Ahmed body with the rear slant angle of 25°. Experiments were carried out in a wind tunnel at two different velocities of U=10m/s and U=20m/s using steady and unsteady excitations. The hot-wire anemometer was used to measure the vortex shedding frequency at the downstream of the body. Pressure distribution was measured using 52 sensors and total drag force was extracted with a load cell. Furthermore, smoke flow visualization was employed to investigate the flow pattern around the body. The results showed that the plasma actuator was more effective on the pressure distribution and total drag force at the velocity of U=10m/s. In fact, by applying steady and unsteady excitations there was 7.3% and 5% drag reduction; respectively. While at the velocity of U=20m/s; the actuator had no significant effect on pressure distribution and total drag. As a remarkable result, the plasma actuator, especially in the steady actuation, has demonstrated its effectiveness on dispersing the longitudinal vortices and suppressing the separated flow on the rear slant at low velocities.

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Section: Quiescent Flow Testmentioning

confidence: 99%

“…A proper carrier frequency in unsteady excitation is estimated using vortex shedding frequency. In most of the time, this frequency is set to be equal with the shedding frequency (Pouryoussefi et al 2015). For this purpose, 1-D Hot-wire probe was placed at the three different locations behind the model shown in Fig.…”

Section: Hot-wire Measurementmentioning

confidence: 99%

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

Shadmani

Nainiyan

Mirzaei

et al. 2018

JAFM

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“…Induced velocity by the plasma actuator is proportional to intensity of applied voltage on the electrodes, as the voltage increases the maximum induced velocity increases too. Maximum induced velocity by the plasma actuator in quiescent air was measured by Pouryoussefi et al (2014). In this reference, a high resolution digital micromanometer and a silicone microtube (0.5 mm diameter) as the Pitot-tube were used for measuring the induced velocity inside the plasma field, where the Pitot-tube was installed downstream the internal edge of the covered electrode with a 5-mm-spacing from this edge and a spacing of 0.5mm from the wall surface.…”

Section: Test Conditions In the Wind Tunnelmentioning

confidence: 99%

“…So, the input electrical parameters supplied to the electrodes were applied voltage (VPP) of 9 kV and the carrier frequency (Fac) of 10 kHz. (Pouryoussefi et al 2014).…”

Section: Test Conditions In the Wind Tunnelmentioning

confidence: 99%

Experimental Study of Plasma Actuator Effects on Flow Field Separation Bubble around Blunt Flat Plate

Kavousfar¹,

Esmaeilzadeh

Mahdavy-Moghaddam³

et al. 2016

JAFM

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In this paper, the air flow around a blunt flat plate with a rounded leading edge has been experimentally examined with and without the presence of a plasma actuator. Tests have been conducted with Reynolds numbers ranging from 10 4 to 10 5 . Significant phenomena in this flow field is the flow separation at the leading edge of the body, which called separation bubble. There are two considerably dimensionless parameters in this experiment. One of them is the leading edge radius ratio to body thickness and other one is the ratio of maximum velocity induced by plasma actuator to free stream velocity. Geometries with the values of R/D=0, 1/16, 2/16, 4/16 were tested. For each geometry, the effectiveness of plasma actuator on the separation bubble is studied in different values of velocity ratio. The results show that, the effect of plasma actuator for the geometry with sharp edge (R/D=0), is negligible, while in geometry with rounded edge, the plasma actuator has significant effect on the separation bubble domain. This effectiveness is enhanced, by increasing of leading edge radius and velocity ratio, so that in rounded edge geometry (R/D=4/16) length of separation bubble is reduced about 75%.

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“…The application of plasma actuator itself on squareback object is not a new thing. Control on the vortex shedding has been done using plasma actuator which resulted in transverse actuator configuration as the best one [10] while another research suggested the placement to be at the upstream of separation point [11].…”

Section: Introductionmentioning

confidence: 99%

Drag reduction due to recirculating bubble control using plasma actuator on a squareback model

Karim

Julian

2018

MATEC Web Conf.

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Abstract. Flow control on a squareback object which resembles many engineering related objects is believed to be highly beneficial. One of the flow characteristics behind the object, recirculating bubble, is known to play significant role in pressure distribution. Meanwhile, plasma actuator implementation on such object is still underdeveloped in application basis. This paper focuses on acquiring a deeper understanding of plasma actuator effect on flow phenomenon behind a squareback object, especially on its application to recirculating bubble control in order to reduce drag. The experiment was divided into drag measurement experiment and visualization experiment. The drag measurement result shows that plasma actuator succeeded on reducing drag up to 15.36% in the lowest Reynolds number. Meanwhile, the visualization experiment shows that plasma actuator has shifted the recirculating bubble position to be closer to the object's wall.

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Experimental study of separation bubble control behind a backward-facing step using plasma actuators

Cited by 40 publications

References 17 publications

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

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

Experimental Study of Plasma Actuator Effects on Flow Field Separation Bubble around Blunt Flat Plate

Drag reduction due to recirculating bubble control using plasma actuator on a squareback model

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