Active flow control on a 1:4 car model

Heinemann, Till; Springer, Matthias; Lienhart, H.; Kniesburges, Stefan; Othmer, Carsten; Becker, Stefan

doi:10.1007/s00348-014-1738-0

Cited by 17 publications

(12 citation statements)

References 14 publications

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“…Vehicles' aerodynamic characteristics have been greatly influenced by the shape of rear end, which also affects the stability and comfort. The effect of steady blowing has been investigated experimentally on a realistic car model by Heinemann et al [19], at three different position namely, (i) perpendicular top position air jet (ii) perpendicular bottom position air jet (iii) tangential bottom position air jet which are shown in Figure 3. Their results showed that rear axle lift was reduced by about 5% with coefficient of drag (CD) changes around 1%.…”

Section: Steady Blowingmentioning

confidence: 99%

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: Steady Blowingmentioning

confidence: 99%

Review on Aerodynamic Drag Reduction of Vehicles

Mukut

Abedin

2019

IJEMM

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“…Alimi [14] investigated the technique of active flow control by using harmonic vortex generator jets for laminar boundary layer separation. Heinemann et al [15] carried out experimental studies on active flow control via high-speed blowing, using a 1:4 scaled model vehicle. These authors demonstrated a reduction of 5% in the rear axle lift with a negligible increase of 1% in the drag.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies on active aerodynamic control via blowing have been focused on drag reduction by preventing the flow separation through blowing or suction. Although a reduction of approximately 7-10% in the aerodynamic drag can be realized by blowing, the main drawback is the large amount of electric energy consumed to inject a high momentum air flow by the fan [12,15]. In contrast, in the ALA, the ram air with a high total pressure is guided to the discharge position through the duct.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Active Aerodynamic Control via Flow Discharge on a High-Camber Rear Spoiler of a Road Vehicle

Lee

Kim

2019

Applied Sciences

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In this study, a numerical investigation of the active aerodynamic control via flow discharge was performed on a two-dimensional simplified vehicle with a spoiler. The analysis was performed using computational fluid dynamics techniques based on the unsteady Reynolds averaged Navier–Stokes equations. Unlike the conventional aerodynamic control methods, in which the control flow is forcibly injected to increase the lift or reduce the drag, the flow discharge method uses the ram air flow to reduce both the downforce and aerodynamic drag of a road vehicle. The technique of aerodynamic control via the flow discharge is applied to a simplified vehicle with a rear spoiler. For the isolated spoiler, at a discharge speed of 40% of the vehicle driving speed, the flow discharge at 75% of the chord exhibited a reduction of 4.5% and 1.8% in the aerodynamic drag and downforce reduction, respectively. For the vehicle with a spoiler, the drag and downforce were respectively reduced, on average, by 3.4% and 19.3% for a vehicle velocity range of 100–300 km/h; in this case, the discharge speed was 40% of the vehicle driving speed, and the discharge position was 75% of the chord owing to the interaction between the spoiler separation flow and vehicle wake.

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“…Some active control techniques have been developed and focusing on local intervention in wall turbulence dealing with steady blowing or suction [14][15][16][17][18][19][20][21][22]. Krentel et al modeled a predictive closed-loop actuation approach for one steady blowing excitation configuration [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of blowing flow control and front geometry towards the reduction of aerodynamic drag on vehicle models

Tarakka¹,

Salam²,

Jalaluddin³

et al. 2019

FME Transactions

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This paper presents analyses of the effect of blowing flow control and variations on front geometry towards the reduction of aerodynamic drag on vehicle models. Blowing flow control is an alternative measure in modifying the onset of flow separation in the boundary layer on the surface of the vehicle. The modification is expected to reduce the dominating influence of the separation area on the total drag. Conducted in computational and experimental approaches, the research investigated the effect of frontal slant angle variations (θ) of 25°, 30° and 35° towards the reduction of aerodynamic drag on vehicle models on the application of blowing flow control with upstream and blowing speed of 16.7 m/s and 0.5 m/s, respectively. Load cells were used in the experimental method to validate the reduction of aerodynamic drag obtained from computational method. It is indicated that the effects of blowing flow control and variations on front geometry are significant in the increasing on pressure coefficients and the reduction of aerodynamic drag on vehicle models. The largest increase on pressure coefficients of 38.93% is indicated on the vehicle model with θ=35°, while the largest reduction of aerodynamic drag occurred on the same model with the values of 14.81 and 12.54 for computational and experimental methods, respectively.

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Active flow control on a 1:4 car model

Cited by 17 publications

References 14 publications

Review on Aerodynamic Drag Reduction of Vehicles

Review on Aerodynamic Drag Reduction of Vehicles

Numerical Study of Active Aerodynamic Control via Flow Discharge on a High-Camber Rear Spoiler of a Road Vehicle

Effect of blowing flow control and front geometry towards the reduction of aerodynamic drag on vehicle models

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