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<p>This study aims to design and develop a multi-element diffuser for open-wheeled race car, with a focus on enhancing downforce generation and overall aerodynamic efficiency. The primary goal is to optimize the diffuser’s capability to generate downforce effectively for Formula 3 race cars, adhering to the guidelines set by the Fédération Internationale de l’Automobile (FIA). This study aims to improve the competitive performance and potential of open-wheel race cars in motorsport, improving the aerodynamic innovation in automotive technology. Two-Dimensional Computational Fluid Dynamics (CFD) analysis using the SST K-Omega Turbulent Model identified a 10° diffuser angle as optimal, achieving a maximum downforce of 198.9N at a 20&#xa0;mm ride height and a velocity of 50&#xa0;m/s. In Three-Dimensional Study, Six diffuser configurations were developed, with the final design showing a 14.22% improvement in downforce at 40&#xa0;m/s and minimal change in the C<sub>L</sub>/C<sub>D</sub> ratio. Scaled wind tunnel tests of the first and sixth configurations revealed a 125% increase in downforce and a 75% improvement in the C<sub>L</sub>/C<sub>D</sub> ratio for the sixth configuration.</p>

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Design and Development of Rear Diffuser for Enhanced Aerodynamic Performance of Open-Wheeled Race Cars

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Sadan Kanchanapalli,
  • Akhil Jalagam,
  • Ashvin Dandothkar,
  • Ravikumar Beecha

摘要

This study aims to design and develop a multi-element diffuser for open-wheeled race car, with a focus on enhancing downforce generation and overall aerodynamic efficiency. The primary goal is to optimize the diffuser’s capability to generate downforce effectively for Formula 3 race cars, adhering to the guidelines set by the Fédération Internationale de l’Automobile (FIA). This study aims to improve the competitive performance and potential of open-wheel race cars in motorsport, improving the aerodynamic innovation in automotive technology. Two-Dimensional Computational Fluid Dynamics (CFD) analysis using the SST K-Omega Turbulent Model identified a 10° diffuser angle as optimal, achieving a maximum downforce of 198.9N at a 20 mm ride height and a velocity of 50 m/s. In Three-Dimensional Study, Six diffuser configurations were developed, with the final design showing a 14.22% improvement in downforce at 40 m/s and minimal change in the CL/CD ratio. Scaled wind tunnel tests of the first and sixth configurations revealed a 125% increase in downforce and a 75% improvement in the CL/CD ratio for the sixth configuration.