Hybrid Method for the Design and Optimization of a Silent Exhaust System for Formula Racing Cars
Keywords:Exhaust system, muffler, sound presure level, finite element analysis, 1D and 3D simulation
In this work, a multilevel CFD analysis was applied for the design of a Formula race car muffler system with improved sound pressure level (SPL) and fluid dynamic response characteristics. The approaches developed and applied for the optimization process range from 1D simulation to full 3D CFD simulation, exploring hybrid approaches based on the integration of a 1D model with 3D tools. Modern silencers typically have a complex system of chambers and flow paths. There are a variety of sound damping and absorption mechanisms that attenuate the sound transmitted through the muffler and pipes. Two calculation methods were selected for this study. The silencer has a complex internal structure containing a perforated pipe and a fibrous material. The CAD file of the silencer was created to develop the FEA model in (AVL BOOST v2017) and another commercial advanced design software (SolidWorks 2017). The FEA model was designed to monitor flow properties, pressure, and velocity. Once the model was verified, sensitivity studies of the design parameters were performed to optimize the sound pressure level of the silencer. The results of the software analysis are included in the paper. Recommendations are made for smoother sound pressure level (SPL) curves for various measurement methods.
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