Impact of Exhaust Manifold Design on Internal Combustion Engine Performance

Optimizing the design of the exhaust manifold plays a crucial role in enhancing engine efficiency, reducing fuel consumption, and minimizing pollutant emissions in internal combustion engines. This study aims to improve the exhaust manifold geometry of the M3 engine, manufactured by PIDOCO (Pioneer Intelligence Design Origin Co.). The primary design objectives include reducing pressure drop and enhancing flow uniformity across the surface of the monolithic catalyst. To achieve these goals, a modified exhaust manifold geometry for the M3 engine was designed, and Computational Fluid Dynamics (CFD) simulations were conducted to evaluate the proposed designs. The geometries were created using CATIA software, while ANSYS Fluent was employed for CFD analysis. The results indicate that optimizing the exhaust manifold geometry reduces pressure drop by 45%, improves the flow uniformity index by 36%, and leads to a minimum 4.5% reduction in vehicle gaseous emissions.