International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 05 | May 2025
p-ISSN: 2395-0072
www.irjet.net
"Shaping the Flow: Aerodynamic Forces, Drag Reduction, and Stability in Modern Vehicles" Viken B Bhagwagar1, Siddharth A Sukhiyajiwala2, Karan M Gandhi3, Devam S Tamakuwala4 1 Department of Mechanical Engineering, Bhagwan Mahavir College of Engineering Technology, Surat, India 2 Department of Automobile Engineering, GIDC Degree Engineering College, Abrama, Navsari, India 3 Department of Automobile Engineering, GIDC Degree Engineering College, Abrama, Navsari, India 4 Department of Automobile Engineering, GIDC Degree Engineering College, Abrama, Navsari, India
---------------------------------------------------------------------***-------------------------------------------------------------------driving experience. However, with the increasing global Abstract - This review paper provides a emphasis on fuel economy, sustainability, and comprehensive analysis of aerodynamic principles, environmental regulations, the role of aerodynamics in drag reduction techniques, and instability effects in automotive design has become more significant than both heavy and light vehicles. It begins with ever [1]. fundamental airflow behaviour and governing equations, followed by the evolution of vehicle A well-optimized aerodynamic design reduces air aerodynamics over the decades. A detailed resistance (drag force), which is one of the most comparison of various vehicle shapes, from passenger dominant forces acting against a moving vehicle. The drag force is generated due to the interaction between cars to race cars, highlights the aerodynamic tradethe car’s surface and the surrounding air, and its offs between drag and downforce. Experimental and reduction can lead to substantial fuel savings. Studies computational studies are examined to evaluate the indicate that for passenger vehicles traveling at effectiveness of drag-reducing devices such as rear highway speeds, nearly 50% of the total engine diffusers, spoilers, vortex generators, and fairings. power is consumed to overcome aerodynamic drag Specific focus is given to crosswind effects and [2]. Even a slight decrease in drag coefficient (Cd) can instability risks, particularly in heavy trucks and contribute to significant fuel efficiency improvements high-speed race cars. Techniques like underbody over long-distance travel, making aerodynamics a optimization, spoiler angle tuning, and wake primary focus for automakers and researchers. In management are discussed for enhancing stability addition to fuel economy, reducing drag also leads to higher top speeds, improved acceleration, and better and performance. The review concludes by handling [3]. emphasizing the role of advanced CFD modeling and wind tunnel testing in aerodynamic development and Apart from drag, lift and downforce are other critical the need for cost-effective design integration in aerodynamic forces that impact vehicle performance and commercial vehicles. stability. The lift force acts in the opposite direction to the vehicle’s weight, reducing traction and making the car unstable at high speeds. Excessive lift, particularly at the rear, can lead to dangerous driving conditions, especially during high-speed maneuvers such as overtaking or cornering. Conversely, downforce is beneficial, as it increases tire grip on the road surface, enhancing control and maneuverability.
Keywords: Aerodynamic Drag, Drag Reduction, Computational Fluid Dynamics (CFD), Wind Tunnel Testing, Lift and Downforce, Rear Spoiler, Rear Diffuser, Vortex Generators (VGs), Yaw Angle, Heavy Vehicles, Race Car Aerodynamics, Flow Separation, Pressure Distribution.
1. INTRODUCTION Aerodynamics is a crucial aspect of modern automotive engineering, influencing key factors such as vehicle performance, fuel efficiency, safety, and stability. It is the study of air flow around objects and can be analyzed using three primary research approaches: theoretical, numerical, and experimental. Since the early days of automobile manufacturing, engineers have sought to improve vehicle aerodynamics to enhance efficiency and
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