Wake Studies of a Model Passenger Car Using PIV

McCutcheon, G; McColgan, A.H.; Grant, Ian; Hurst, D.

doi:10.4271/2002-01-3335

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…This means that there is a strong inward flow from lateral side of the vehicle. McCutcheon et al (2002) found this phenomenon at the location of x/L = 1.0 but it is shown at x/L = 0.5 in this experiment. The discrepancy mainly results from the fact they measured the wake for a hatch-back vehicle which has different rear shape from the present notch-back vehicle.…”

Section: Wake Structure In the Streamwise Planementioning

confidence: 58%

“…Cogotti and Gregorio (2000) studied the wake of the rear-view-mirror and the flow field around the left side of a frontal wheel of the full-size vehicle. McCutcheon et al (2002) investigated the wake flow of the simplified car model according to the angle of the hatchback. Al-Garni and Bernal (2003) and Heineck and Walker (1999) carried out PIV measurements to examine the characteristics of the turbulent flow around a truck.…”

Section: Introductionmentioning

confidence: 99%

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Effects of an air spoiler on the wake of a road vehicle by PIV measurements

Kim

Sung

et al. 2006

J Vis

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A particle image velocimetry (PIV) technique has been used to analyze the flow characteristics behind a road vehicle with/without an air spoiler attached on its trunk and also to estimate its effect on the wake. A vehicle model scaled in the ratio of 1/43 is set up in the mid-section of a closed-loop water tunnel. The Reynolds number based on the vehicle length is 10 5 . To investigate the three-dimensional structure of the recirculation zone and vortices, measurements are carried out on the planes both parallel and perpendicular to the free stream, respectively. The results show significantly different vorticity distributions in the recirculation region according to the existence of the air spoiler. The focus and the saddle point, appearing in the wake, are disposed differently along the spanwise direction. Regarding the streamwise vortices, the air spoiler produces large wing tip vortices. They have opposite rotational directions to C-pillar vortices which are commonly observed in the case that an air spoiler is absent. The wing tip vortices generate the down force and as a result, they might make the vehicle more stable in driving.

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Section: Wake Structure In the Streamwise Planementioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Effects of an air spoiler on the wake of a road vehicle by PIV measurements

Kim

Sung

et al. 2006

J Vis

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“…The sinusoidal velocity shape of 33.3 m/s is specified at the inlet to mimic the road conditions, the pressure outlet and the moving ground are specified as other boundary conditions. Transient calculation with a time step of 0.025 s is used to simulate the vehicle moving on the sinusoidal road and the steady-state simulation analysis is used to simulate the wind tunnel test for vehicle driving on the no-grad or flat road conditions (Jones and Clark, 2005;McCutcheon et al, 2002;Borg et al, 2003).…”

Section: Cfd Simulations 31 Model Establishmentmentioning

confidence: 99%

Vehicle aerodynamic simulation analysis and research on bumpy road

Zheng

2020

HFF

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Purpose In order to certify the testing of vehicle Cd on the real road can be replaced by the much simplified steady-state simulation process inside wind tunnel. Design/methodology/approach The paper opted innovative methods to verify the feasibility of using aerodynamic wind tunnel test for vehicle development purpose, including establishing the typical sinusoidal mapping function for road shapes during vehicle driving process to simplify the complexity of the road and choosing three different kinds of road spectrum amplitudes to establish the vehicle motion model, which can accurately predict the vehicle motion characteristics in the road driving process. The new approach simulates the vehicle aerodynamics on the road by taking into account the pitch angle changes during vehicle motion. Findings By comparing the transient drag coefficient on road with the steady-state simulated value in the conventional aerodynamic wind tunnel. This paper provides empirical insights about the flow field analysis around the vehicle on road that can verify the feasibility of using aerodynamic wind tunnel test for vehicle development purpose. Research limitations/implications Because of establishing the typical sinusoidal mapping function for road shapes, the study results may lack generalizability. Therefore, researchers are encouraged to test the proposed propositions further. Practical implications This paper includes implications for the flow field analysis around the vehicle on road that can verify the feasibility of using aerodynamic wind tunnel test for vehicle development purpose. Originality/value This paper fulfills an identified need to use aerodynamic wind tunnel test for vehicle development purpose.

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“…Highly complex wake structures, including those generated by a helicopter-type rotor system [114] and those generated behind an Ahmed model car [115], have been measured in two-dimensions with DPIV and PIV respectively. In the ®rst case, the vortex wake interaction with a stationary blade was investigated from a pitching and rotating rotor system.…”

Section: Wakesmentioning

confidence: 99%

The application of laser measurement techniques to aerospace flows

Lawson

2004

Proceedings of the Institution of Mechanical Engineers, Part G:

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Laser measurement techniques are becoming more commonly applied to many areas of thermo¯uids and heat transfer. An area of their application, which presents highly challenging requirements, is in the measurement of aerospace¯ows. In this case the experimentalist may encounter high mass¯owrates, high-speed¯ows and in some cases high temperatures, and the measurements may also have to be taken with restricted optical access. Such types of¯ow have already been measured using established laser techniques such as particle image velocimetry, laser Doppler anemometry, laser-induced¯uorescence and liquid crystal thermography. Other more recent techniques which have seen application include Doppler global velocimetry and molecular tagging velocimetry for velocity measurement and thermographic phosphor thermometry for surface temperature measurement. This paper reviews the most recent advances in laser techniques and their application to aerospace environments.

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Wake Studies of a Model Passenger Car Using PIV

Cited by 8 publications

References 12 publications

Effects of an air spoiler on the wake of a road vehicle by PIV measurements

Effects of an air spoiler on the wake of a road vehicle by PIV measurements

Vehicle aerodynamic simulation analysis and research on bumpy road

The application of laser measurement techniques to aerospace flows

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