Some Problems Concerning Wind Tunnel Testing of Automotive Vehicles

Gross, Donald S.; Sekscienski, William S.

doi:10.4271/660385

Cited by 19 publications

(2 citation statements)

References 3 publications

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“…In this configuration, the blockage ratio of the model to the test section frontal surfaces was below 5 %, as advised by Gross and Sekscienski. 43 The following results are presented for an upstream velocity U 0 of 12 m s À1 , corresponding to a Reynolds number Re ¼ U 0 H= ¼ 8:5 Â 10 4 based on the trailer's height, where is the air kinematic viscosity.…”

Section: Methodology a Experimental Methodology 1 Test Facilitymentioning

confidence: 99%

Experimental and numerical characterization of the airflow in the wake of a heavy truck

Pérard-Lecomte,

Djeddou,

Fokoua

et al. 2023

Physics of Fluids

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The wake flow of a heavy truck model is investigated at Re=8.5×104 using particle image velocimetry measurements combined with computational fluids dynamics-simulations. Experimental measurements are carried out on a 1:28-scale model, focusing exclusively on the central longitudinal plane, in the rear of the truck model. Numerical simulations are performed based on the URANS (unsteady Reynolds averaged Navier–Stokes) approach using two statistical turbulence models, i.e., the shear stress transport k–ω and the baseline Reynolds stress (BSL-RSM) models. A comparison between the numerical and experimental results of the mean velocity profiles in the wake of the heavy truck is found to be relatively consistent. The BSL-RSM model, however, gives a better prediction of experiments, with a deviation of 6% in the near wake, against 13% for the SST k–ω. Both URANS models undervalue the streamwise and spanwise turbulence intensity components with a deviation around 24%, compared with the experimental results. The characteristic feature of the wake flow topology is the formation of a recirculation bubble resulting from the shear layers separated from the truck surfaces. Different identification methods, including visualization of closed streamlines, vorticity magnitude, and the Q-invariant criterion, are considered and highlight the existence of two particular vortex regions in the mean flow: a vortex-shedding area in the upper recirculation region and a back-truck attached vortical structure. It is found that the Q criterion-based technique is a relevant indicator of the vortex cores regions.

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Section: Methodology a Experimental Methodology 1 Test Facilitymentioning

confidence: 99%

Experimental and numerical characterization of the airflow in the wake of a heavy truck

Pérard-Lecomte,

Djeddou,

Fokoua

et al. 2023

Physics of Fluids

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“…The papers [10][11][12][13][14][15] are devoted to the method of experimental investigation of vehicles aerodynamics. A huge amount of material was accumulated to determine the constant value of Cx for various vehicles.…”

Section: автомобільний транспорт вип 51 2022mentioning

confidence: 99%

Assessment of increased energy efficiency of vehicles with a rational reduction of engine capacity

Podrigalo¹,

Kholodov²,

Tarasov³

et al. 2022

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Problem. The tendency to reduce the working volume of internal combustion engines, which has emerged in recent years in the global automotive industry, is due to the need to improve the environmental situation and energy efficiency of road transport. Goal. The aim of the study is to increase the energy efficiency of vehicles by rationally reducing the maximum effective engine capacity. Methodology. The work uses the method of partial accelerations, implemented in a mobile registration and measurement complex, which allowed the authors to obtain an improved formula for calculating the force of aerodynamic resistance. Experimental studies of car aerodynamics were also carried out. Results. The article presents the results of the authors' research, which made it possible to prove the possibility of reducing the power of the internal combustion engine while maintaining the specified maximum speed and the specified level of indicators of the dynamic properties of cars. Originality. The relationship between the degree of use of the maximum engine power and the relative change in the effective specific fuel consumption of a carburetor gasoline engine with direct injection of gasoline and diesel is determined. Practical value. Calculations performed on the example of the ZAZ-1103 "Slavuta" car showed that a rational reduction in effective power allows for a 9.5% reduction in fuel consumption, and for an engine with direct injection of gasoline and diesel engines, this leads to an increase in fuel consumption by 6.7 % and 20.3%, respectively.

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The underbody flow of an EDS-type advanced ground transport vehicle

Howell

Everitt

1981

Journal of Wind Engineering and Industrial Aerodynamics

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Some Problems Concerning Wind Tunnel Testing of Automotive Vehicles

Cited by 19 publications

References 3 publications

Experimental and numerical characterization of the airflow in the wake of a heavy truck

Experimental and numerical characterization of the airflow in the wake of a heavy truck

Assessment of increased energy efficiency of vehicles with a rational reduction of engine capacity

The underbody flow of an EDS-type advanced ground transport vehicle

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