Drag reduction by pulsed jets on strongly unstructured wake: towards the square back control

Bideaux, Éric; Bobillier, Pierre; Fournier, Elisabeth; Gilliéron, Patrick; Hajem, Mahmoud El; Champagne, Jean‐Yves; Gilotte, Philippe; Kourta, Azeddine

doi:10.1504/ijad.2011.038846

Cited by 27 publications

(21 citation statements)

References 5 publications

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“…3.4 Pulsed Jet Effectiveness of pulsed jet has been investigated experimentally on the suppression of the rear slant recirculation bubble, without acting on longitudinal structures on an Ahmed body with 25° slant angle and it is found that 6 -8% maximum drag reduction is obtained depending on the geometric and jet exhaust configurations that show different sensitivity to the forcing parameters [30]. Another investigation has been carried out with an Ahmed body having 35° slant angle where 20% drag reduction is achieved that confirms the interest in using pulsed jets (shown in Figure 6) in order to reduce aerodynamic drag and pollutant emission [31]. By acting on the kinematic of the wake, this control technique changes the wall pressure and shear stress distributions on geometry of vehicles and generates evolutions in energy dissipation per unit process [32].…”

Section: Synthetic Jetssupporting

confidence: 53%

“…Maximum contribution of drag reduction for different control methods is shown in Figure 22. From the above analysis, it is seen that the drag reduction for active control system could be as much as 20% by using the pulse jet [31,32] and plasma actuator [39] as shown in Figure 20 and 22. On the other hand, for passive control system, the drag could be decreased to 21.2% by using Flaps [50] as shown in Figure 21 and 22.…”

Section: Discussionmentioning

confidence: 93%

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Review on Aerodynamic Drag Reduction of Vehicles

Mukut

Abedin

2019

IJEMM

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Due to higher price, limited supply and negative impacts on environment by fossil fuel, automobile industries have directed their concentrations in reducing the fuel consumption of vehicles in order to achieve the lower aerodynamic drag. As a consequence, numerous researches have been carried out throughout the world for not only getting the optimum aerodynamic design with lower drag penalty and but also other parameters that increases the fuel consumption. In this regard, relevant experimental and numerical outcomes on vehicle drag reduction considering various techniques such as active, passive and combined techniques in order to delay or suppress flow separation behind the vehicles have been considered in this review paper. Furthermore, the effects of drag reduction and their applicability on the vehicles are also illustrated in this paper. Therefore, it is conjectured that the drag reduction has been improved as much as 20%, 21.2%, and 30% by using the active, passive and combined control systems, respectively.

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Section: Synthetic Jetssupporting

confidence: 53%

Section: Discussionmentioning

confidence: 93%

Review on Aerodynamic Drag Reduction of Vehicles

Mukut

Abedin

2019

IJEMM

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“…This is not the only option to improve the aerodynamics of a car. There are also ways of controlling the flow around the vehicle by means of continuous or oscillating air blowing [6,4,14]. In this work, numerical calculations were performed to examine the aerodynamic drag force created on individual body parts of the high energy efficiency vehicle, specially designed for the Shell Eco-marathon competition.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Influence of Particular Parts of the High Efficient Electric Vehicle on the Aerodynamic Forces

Czyż¹,

Karpiński²,

Koçak³

2019

Adv. Sci. Technol. Res. J.

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The work presents a three-dimensional modeling of air flow around the research object. The purpose of this work was to perform numerical calculations to identify the magnitude of the aerodynamic drag force generated on individual elements of a high energy efficiency vehicle body. This vehicle, specially designed for the Shell Eco-marathon competition, needs to show the lowest possible fuel consumption while maintaining the prescribed speed. Minimizing the drag force at an early designing stage plays an important role here. The calculations were performed using the ANSYS Fluent calculation solver. The result of the conducted research is a description of the velocity and pressure distributions around the tested vehicle as well as an identification of the drag force on the external surfaces of the components and a description of the relationship between them. The work also discusses the dependence of the drag force as a function of speed in the range from 0 to 12 m/s. The influence of the ground on the drag force in the case when the object was immobilized in relation to the walls at the flowing medium, as in a wind tunnel, was investigated. On the basis of the calculations performed, no impact of the ground on the generated drag force magnitude was found.

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“…To improve this negative situation, one way is to use active flow control to reduce drag. Vehicle wakes are characterized by both large pressure drag and coherent structures [9,5,2,7]. In addition, their 3D features, which contribute for large part of performance losses, make the physical mechanisms at play even more complex.…”

Section: Introductionmentioning

confidence: 99%

Transport mechanisms inside the turbulent wake of a bluff body

2019

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Based on the recent work of Stella et al. on the bidimensional (2D) flow behind a ramp [11, 10], the present paper aims at analysing the entrainment phenomenon in a three-dimensional (3D) turbulent wake downstream of a bluff-body. Numerical and experimental data of different configurations of the Ahmed body are investigated. This study is part of a framework on the aerodynamic drag reduction for ground vehicles by defining proper and realistic control laws derived from the entrainment.

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Drag reduction by pulsed jets on strongly unstructured wake: towards the square back control

Cited by 27 publications

References 5 publications

Review on Aerodynamic Drag Reduction of Vehicles

Review on Aerodynamic Drag Reduction of Vehicles

Numerical Analysis of the Influence of Particular Parts of the High Efficient Electric Vehicle on the Aerodynamic Forces

Transport mechanisms inside the turbulent wake of a bluff body

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