Aerodynamics Analysis of Several Typical Cars

Yang, Xiaoping; Cai, Zh.; Ye, Q.

doi:10.1134/s1810232819020085

Cited by 5 publications

(2 citation statements)

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“…The base slant angle affects the rear trailing vortices strength and separation (Ahmed et al , 1984). The car with the small head, slowly rising engine cover and window, a proper downward tilt at the top of the tail and a proper upward tilt at the bottom of the tail, has little influence for air resistance and reduces the trailing vortex of the body (Yang et al , 2019). Rounding both the vehicle’s front and rear corners reduces the drag coefficient by 22%–33% (Saltzman and Meyer, 1974).…”

Section: Introductionmentioning

confidence: 99%

Flow control of a vehicle using reverse flow fan

Raj Mohamed,

2023

AEAT

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Purpose This study aims to achieve optimum flow separation control for a road vehicle using a reverse flow fan on rear side. Design/methodology/approach A full-length reverse flow fan array (fan’s air speed is 50% of the car’s speed) is attached throughout the width of the vehicle at rear edge corner. Findings The reverse flow fan array positioned at rear edge of car pushes the airflow against the car’s rear window. It creates the recirculation region and alters the pressure distribution. This reduces the lift coefficient by 150%, which becomes the downforce and reduces the drag coefficient by 22%. As the car speed increases, fan speed should also be increased for effective flow control. Research limitations/implications This active flow control method for 3D Ahmed car body has been studied computationally at low speed (40 m/s). Practical implications This design increases the downforce, thus gives better cornering speed and stability, and decreases the drag which improves fuel efficiency. It can be used for effective flow control of cars (hatchback/sedan). The findings can be applied to the bluff bodies, road vehicles, UAV and helicopter fuselage for flow separation control. Originality/value The fan array is attached on car’s rear side, which blows air against the car’s rear window. It alters the pressure distribution and aerodynamics forces favorably. But the existing high-speed fan used in a sports cars sucks the air from bottom and pushes it rearward, which increases both the traction force and drag.

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Section: Introductionmentioning

confidence: 99%

Flow control of a vehicle using reverse flow fan

Raj Mohamed,

2023

AEAT

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“…In earlier times, high-speed cars were only dependent upon horsepower of the engine to maintain the performance segment of the vehicle. But in recent trends, design engineers are adapting the concepts of aerodynamics to enhance the efficiency of the vehicle [2,3]. Fuel consumption due to aerodynamic drag consumes about half the vehicle's energy [4,5].…”

Section: Introductionmentioning

confidence: 99%

Drag reduction by application of aerodynamic devices in a race car

et al. 2021

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In this era of fast-depleting natural resources, the hike in fuel prices is ever-growing. With stringent norms over environmental policies, the automotive manufacturers are on a voyage to produce efficient vehicles with lower emissions. High-speed cars are at a stake to provide uncompromised performance but having strict rules over emissions drives the companies to approach through a different route to keep the demands of performance intact. One of the most sought-after ways is to improve the aerodynamics of the vehicles. Drag force is one of the major setbacks when it comes to achieving high speeds when the vehicle is in motion. This research aims to examine the effects of different add on devices on the vehicle to reduce drag and make the vehicle aerodynamically streamlined. A more streamlined vehicle will be able to achieve high speeds and consequently, the fuel economy is also improved. The three-dimensional car model is developed in SOLIDWORKS v17. Computational Fluid Dynamics (CFD) is performed to understand the effects of these add on devices. CFD is carried out in the ANSYS™ 17.0 Fluent module. Drag Coefficient (CD), Lift Coefficient (CL), Drag Force and Lift Force are calculated and compared in different cases. The result of the simulations was analyzed and it was observed that different devices posed several different functionalities, but maximum drag reduction was found in the case of GT with spoiler and diffuser with a maximum reduction of 16.53%.

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