Aerodynamic Characteristics of Ahmed Body with Inverted Airfoil Eppler 423 and Gurney Flap on Fastback Car

Abstract

The installation of aerodynamic devices, such as rear wings with the application of a Gurney flap, is very important to improve the performance of vehicles and can generate downforce and reduce slip when a car turns and brakes. The goal of this study was to determine the aerodynamic characteristics of the addition of a rear wing using an Eppler 423 airfoil, which was applied with a Gurney flap featuring variations in the angle of attack and the height of the Gurney flap. The rear wing was mounted on the Ahmed body with a rear slant angle of 15°, which is similar to the configuration on a fastback type car. This research was conducted by 3D modeling through computational fluid dynamics (CFD) simulation using ANSYS Student R18.2 by using ahmed body design. There are three variations in the angle of attack for the rear wing (0°, 7.5°, and 15°), as well as five variations in Gurney flap height of 0%, 0.5%, 1%, 1.5%, and 2% for the chord-line length. In this study, the best variation was found at an angle of attack of 15⁰ with a height of 2% C. From this configuration improved CL/CD ratio by 25.36% when compared to the results without a Gurney flap.

Pengaruh Penambahan Gurney Flap pada Airfoil NACA 0015

“…li et al [3] melakukan penelitian mengenai efek penambahan gurney flap pada airfoil dan mengungkapkan hasil penambahan gurney flap pada airfoil akan meningkatkan nilai koefisien angkat. Peningkatan secara bersamaan terhadap nilai koefisien angkat serta penurunan nilai koefisien hambat dapat dilakukan dengan penambahan gurney flap [4]. Pemasangan gurney flap adalah tegak lurus terhadap garis chord pada trailing edge yang diletakkan di sisi tekan airfoil [3].…”

Application of Multi-objective Adjoint-based Aerodynamic Optimisation on Generic Road Vehicle with Rear Spoiler

“…The application of computational methods for aerodynamic shape optimisation has gained research attention in many engineering fields, especially in the aeronautics [1], [2] and automotive field [3], [4]. Shape optimisation in road vehicle applications is generally aimed at reducing the aerodynamic drag [5], [6], increasing the downforce [7], [8], or reducing the side force due to the presence of crosswind [9], [10]. Reducing vehicle drag is more generally applied in almost all aerodynamic optimisations.…”

Mitigation of Porosity and Residual Stress on Carbody Aluminum Alloy Vibration Welding: A Systematic Literature Review

“…In recent decades, aerodynamic design and lightweight vehicle bodies have become the new standard for fuel efficiency purposes [1], [2]. The use of new materials to replace steel such as composite, aluminum or steel/non-steel combinations is the choice of automotive manufacturers to meet new standards [3], [4].…”