Numerical Investigation of Aerodynamic Braking for a Ground Vehicle

Devanuri, Jaya Krishna

doi:10.1007/s40032-017-0385-7

Cited by 11 publications

(2 citation statements)

References 11 publications

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“…The vehicle is equipped with a passive front wing and an active rear wing, which, according to [34], is the most common air brake setup. In fact, a front airbrake could significantly disrupt the airflow and reduce the potential downforce and drag generated by the rear wing, which would not receive a freestream airflow any longer [35]. The rear wing can vary its angle of attack, φ r , between the conditions of (i) maximum efficiency in terms of the lift-to-drag ratio and maximum downforce (φ r = −14 deg) and (ii) maximum drag (φ r = −60 deg).…”

Section: Case Study Vehiclementioning

confidence: 99%

On the Benefits of Active Aerodynamics on Energy Recuperation in Hybrid and Fully Electric Vehicles

et al. 2023

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In track-oriented road cars with electric powertrains, the ability to recuperate energy during track driving is significantly affected by the frequent interventions of the antilock braking system (ABS), which usually severely limits the regenerative torque level because of functional safety considerations. In high-performance vehicles, when controlling an active rear wing to maximize brake regeneration, it is unclear whether it is preferable to maximize drag by positioning the wing into its stall position, to maximize downforce, or to impose an intermediate aerodynamic setup. To maximize energy recuperation during braking from high speeds, this paper presents a novel integrated open-loop strategy to control: (i) the orientation of an active rear wing; (ii) the front-to-total brake force distribution; and (iii) the blending between regenerative and friction braking. For the case study wing and vehicle setup, the results show that the optimal wing positions for maximum regeneration and maximum deceleration coincide for most of the vehicle operating envelope. In fact, the wing position that maximizes drag by causing stall brings up to 37% increased energy recuperation over a passive wing during a braking maneuver from 300 km/h to 50 km/h by preventing the ABS intervention, despite achieving higher deceleration and a 2% shorter stopping distance. Furthermore, the maximum drag position also reduces the longitudinal tire slip power losses, which, for example, results in a 0.4% recuperated energy increase when braking from 300 km/h to 50 km/h in high tire–road friction conditions at a deceleration close to the limit of the vehicle with passive aerodynamics, i.e., without ABS interventions.

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Section: Case Study Vehiclementioning

confidence: 99%

On the Benefits of Active Aerodynamics on Energy Recuperation in Hybrid and Fully Electric Vehicles

et al. 2023

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“…Research on electrohydraulic braking systems helped production of automatic collision braking systems for autonomous vehicles. Studies on position of air brakes their impact on coefficient of drag also led to interesting improvements in aerodynamics of the vehicle [4][5][6].…”

Section: Theoreticalmentioning

confidence: 99%

Aerodynamic Performance Enhancement of a Sports Vehicle Using Numerical Techniques

Gupta

Srinivas

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Evaluation of vehicle aerodynamics is an integral part of automotive engineering. The aerodynamic performance of automobile has great influence on the power performance, economy, handling stability and ride comfort of the vehicle. In this context, the present work focuses on improving the aerodynamic performance of a modelled sports vehicle using numerical techniques. Baseline analysis of a research paper was conducted for validation of the results obtained in numerical simulations. Multiple turbulence models, flow boundary conditions, and inlet parameters were explored using Ansys Fluent Computational Fluid Dynamics software. The validation of the baseline data was proved using convergence, numerical and theoretical validation. Solution convergence parameters were Absolute Residual criteria and Mass Flow Rate. Grid Independency, Inlet Velocity and Flow Turbulence Model checks were employed to further refine the accuracy of simulations. This research studied and presented the effects of a two-flap spoiler on the aerodynamic performance of the vehicle using pressure, velocity, and eddy viscosity contours using simulations of incompressible air flow over the modelled car body. Improved flow contours exhibited a reduction of Coefficient of Drag and Lift parameters. Using Coefficient of Pressure (Cp) as a baseline parameter, multiple configurations of flow boundary conditions were explored. The literature consists of theoretical, experimental, and numerical aspects of the research papers and journals that were studied for this research. The objectives were to model, mesh and simulate a sports car to better understand the flow vortices and validate the aerodynamic flow parameters with the studied literature.

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Computational Fluid Dynamics Analysis of Effect of Braking Plate Configurations on the Aerodynamic Behaviors of an Ahmed Car

Jiang

Niu

et al. 2022

Flow Turbulence Combust

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Numerical Investigation of Aerodynamic Braking for a Ground Vehicle

Cited by 11 publications

References 11 publications

On the Benefits of Active Aerodynamics on Energy Recuperation in Hybrid and Fully Electric Vehicles

On the Benefits of Active Aerodynamics on Energy Recuperation in Hybrid and Fully Electric Vehicles

Aerodynamic Performance Enhancement of a Sports Vehicle Using Numerical Techniques

Computational Fluid Dynamics Analysis of Effect of Braking Plate Configurations on the Aerodynamic Behaviors of an Ahmed Car

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