Drag reduction of motor vehicles by active flow control using the Coanda effect

Geropp, D.; Odenthal, Hans-Jürgen

doi:10.1007/s003480050010

Cited by 51 publications

(30 citation statements)

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“…Previous studies by Englar (2003) and Geropp (2000) used a trailing edge radius in combination with steady blowing at the rear of squareback vehicles to create a coanda effect. This was used to turn freestream flow towards the centre of the wake region to increase the pressure on the base of the vehicle.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic drag reduction of a simplified squareback vehicle using steady blowing

Littlewood

Passmore

2012

Exp Fluids

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Section: Introductionmentioning

confidence: 99%

Aerodynamic drag reduction of a simplified squareback vehicle using steady blowing

Littlewood

Passmore

2012

Exp Fluids

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“…The Reynolds number is calculated by (4), where is the viscosity coefficient which equals 1.81 × 10 −5 Pa⋅s:…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…As a result, the active control method was put forward. For example, a blower can be installed to the tail to optimize the wake flow [4]. There have been some other active control methods used to optimize the wake flow.…”

Section: Introductionmentioning

confidence: 99%

A New Method to Optimize the Wake Flow of a Vehicle: The Leading Edge Rotating Cylinder

Shao

Yao

Zhang

et al. 2017

Mathematical Problems in Engineering

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The wake flow of a vehicle significantly influences its aerodynamic performance and the stability during high-speed drive. Therefore, optimization of the vehicle wake flow is an effective way to improve its aerodynamic performance and further improve the handling stability and fuel economy. In this paper, a new method, the leading edge rotating cylinder, is used to optimize the wake flow of a vehicle. According to the results of simulations, this method can reduce the pressure drag, increase the negative lift force, and strengthen the stability of the vehicle under crosswind. Furthermore, this method optimizes not only the wake flow of the vehicle with rotating cylinders but also the interactive vehicles in the driving route in overtaking maneuvers or platoon driving. In conclusion, this method effectively optimizes the flow fields around the vehicles, and it significantly helps to improve the handling stability and fuel economy of the vehicle.

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“…In contrary, passive flow control involves geometrical modifications in flow system without any auxiliary energy (control rod or plate, passive vortex generators, surface waviness, surface roughness etc.). Many active and passive flow control methods were employed for one main purpose such as only drag reduction [2][3][4][5][6] or only vortex-induced vibration (VIV) suppression [7,8], etc. But less attention paid to both reducing mean drag and fluctuating forces concurrently on bluff bodies.…”

Section: Introductionmentioning

confidence: 99%

Active control of flow around a square prism by slot jet injection

Fırat

Akansu

Hacıalioğulları

2013

EPJ Web of Conferences

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Abstract. The main aim of the experimental study is to determine both the most effective injection surface and rate in order to ensure minimum drag and fluctuating forces on a square prism subjected to crossflow. All predetermined jet injection surfaces i.e. front, side, and rear, tested separately for injection ratios of IR = 0, 1, 1.5, 2 at Reynolds number of Re = 16,000. Surface pressures were measured by differential pressure transducer whereas instantaneous velocity measurements were performed by using multichannel Constant Temperature Anemometer (CTA). It was concluded that jet injection, especially from the rear surface, brought noticeable improvements to the flow characteristics of a square prism. For rear jet configuration with IR = 1.5, the mean drag coefficient ( ) was reduced to 79.4% and level on side surfaces was reduced to 20% of that of the single square prism. In addition, instantaneous flow visualization photographs and Strouhal number (St) distribution across the injection ratio were also presented to identify the flow patterns and underlying mechanism of drag and fluctuating force reduction of square prism with rear jet configuration.

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Drag reduction of motor vehicles by active flow control using the Coanda effect

Cited by 51 publications

References 0 publications

Aerodynamic drag reduction of a simplified squareback vehicle using steady blowing

Aerodynamic drag reduction of a simplified squareback vehicle using steady blowing

A New Method to Optimize the Wake Flow of a Vehicle: The Leading Edge Rotating Cylinder

Active control of flow around a square prism by slot jet injection

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