Study of the automotive aerodynamic performance affected by entrance structure of forecabin

Huang, Yuqi; Wang, Shun; Yuan, Jing; Liu, Zhentao

doi:10.1016/j.enbenv.2020.06.012

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…Few studies have used various turbulent models to investigate the aerodynamic performance of vehicles' surroundings. Huang et al [16] utilized Large Eddy Simulation (LES) to simulate large-scale turbulent motion at the entrance structure of the forecabin in an Ahmed body. Compared to the original Ahmed model, the presence of the forecabin will increase the oscillation frequency of the flow field by approximately 15 times.…”

Section: Introductionmentioning

confidence: 99%

Drag Reduction on a Three Dimensional Teardrop-Shaped Body Car with Different Stagnation Points

Lee

Tiew²,

Chang³

et al. 2022

Int. J. Automot. Mech. Eng.

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The long-term goal in the automotive industry is to reduce fuel consumption and environmental pollution without compromising the aerodynamic performance of the car. Herein, the aerodynamic performance of an in-house designed Shell Eco-Marathon prototype car is analyzed using Computational Fluid Dynamics simulations. Shape optimization of the Shell car is executed to reduce drag by modifying the rear underbody profile and stagnation point position. The effect of one modification to another is studied to determine the changes to overall flow around the car and, more importantly, the lift and drag coefficients. It has been found that the stagnation point height has a higher influence on the aerodynamic performance of the car compared to variations of the rear underbody, with optimum drag reductions of 17% and 10%, respectively. Moreover, combining the two best configurations to the car reduces CD by 25%, and this marks the highest drag reduction achieved in this study.

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Section: Introductionmentioning

confidence: 99%

Drag Reduction on a Three Dimensional Teardrop-Shaped Body Car with Different Stagnation Points

Lee

Tiew²,

Chang³

et al. 2022

Int. J. Automot. Mech. Eng.

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Experimental investigation of the flow features around an elliptical Ahmed body

Siddiqui

Agelin‐Chaab

2022

Physics of Fluids

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The Ahmed body with a rectangular rear end is a simplified, canonical bluff body geometry that shares similarities with generic road vehicles. It is known to produce flow separations and strong vortices at the rear end. The aerodynamic performance of vehicles is significantly affected by such three-dimensional flow structures. This work proposed a modified Ahmed body with an elliptical rear end called the elliptical Ahmed body. The study examines in detail the near-field characteristics of the flow over the elliptical Ahmed body at a slant angle of 25{degree sign} with a low Reynolds number of 1.4 x 104 based on the model height. The principal flow features are analyzed using time-resolved and standard particle image velocimetry. The time-averaged and time-resolved analyses revealed a flow transition at the rear end that eliminated the slant separation bubble. Furthermore, a significant wake flow restructuring is found to curb the lower recirculation bubble and shift the upper recirculation bubble towards the slant surface. Several distinct Strouhal numbers are found over the slant surface and wake region. In addition, the effect on coherent structures is evaluated using proper orthogonal decomposition and dynamic mode decomposition, which shows a considerable difference between the standard and elliptical Ahmed body wake structures. The results of this investigation show that body modification of the Ahmed body using elliptical curvature at the rear end can significantly affect the overall flow features and help improve the aerodynamics performance of the vehicles.

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Degradation Analysis of 18650 Cylindrical Cell Battery Pack with Immersion Liquid Cooling System. Part 2: Aging Assessment at Cell Level

Rüwald,

Marongiu,

van Faassen

et al. 2024

Preprint

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Study of the automotive aerodynamic performance affected by entrance structure of forecabin

Cited by 3 publications

References 14 publications

Drag Reduction on a Three Dimensional Teardrop-Shaped Body Car with Different Stagnation Points

Drag Reduction on a Three Dimensional Teardrop-Shaped Body Car with Different Stagnation Points

Experimental investigation of the flow features around an elliptical Ahmed body

Degradation Analysis of 18650 Cylindrical Cell Battery Pack with Immersion Liquid Cooling System. Part 2: Aging Assessment at Cell Level

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