A hybrid method technique for design and optimization of Formula race car exhaust muffler

Abstract

In this work a multilevel Computational Fluid Dynamics (CFD) analysis has been applied for the design of a Formula race car exhaust muffler with improved characteristics of sound pressure level (SPL) and fluid dynamic response. The approaches developed and applied for the optimization process range from the 1D to fully 3D CFD simulation, exploring hybrid approaches based on the integration of a 1D model with 3D tools. Modern mufflers typically have a complex system of chambers and flow paths. There are a variety of sound damping and absorbing mechanisms working to quiet the sound flowing through a muffler and piping system. Two calculation methods were selected for this study. The muffler has a complex inner structure containing perforated pipe and fiber material. Computer-aided design (CAD) file of the muffler was established for developing Finite Element Analysis (FEA) model in AVL BOOST v2017 and another commercial advanced design software (SolidWorks 2017). FEA model was made to monitor the flow properties, pressure and velocity. After the model was verified, sensitivity studies of design parameters were performed to optimize the SPL of the muffler. The software analysis results are included in the paper. Recommendations are made for obtaining smoother SPL curves for various measurement methods.

Investigation of the effects of volume change on flow structure and acoustic in a silencer

“…The study's findings suggested that using sound-absorbing material could lower SPL by 15% to 20%. [13][14][15] For automotive engines, Vasiraja and Saravana Sathiya Prabhahar 16 designed a muffler with perforated inner pipes and nozzles to reduce the sound pressure level. The investigation looked at the effect of convergence angle and nozzle number.…”

“…The study's findings suggested that using sound-absorbing material could lower SPL by 15% to 20%. 13–15…”

Numerical Investigation of the Effect of Muffler Geometry on Engine Performance

“…Power-train and chassis consist of electrical powertrain component, braking system, engine component, cooling system, lubrication system, fuel system, steering system, transmission system suspension system and exhaust system [9]- [13]. Exhaust system is designed to convey the emission from the engine away from the driver and passengers and to reduce the emissions the vehicle releases into the environment [14], [15]. It control the delivery of hot gasses and provide information to the vehicle's computer in order to significantly improve vehicle performance and reduce the amount of noise generated by the vehicle.…”

“…It control the delivery of hot gasses and provide information to the vehicle's computer in order to significantly improve vehicle performance and reduce the amount of noise generated by the vehicle. The major components of the exhaust system include exhaust manifold, catalytic converter, exhaust pipe, resonator, muffler, oxygen sensors and tailpipe [12], [15], [16].…”

Exhaust Prototype Design of L12B Engine

“…Therefore the use of computational technology is used in this research. The use of computational technology in this research is the use of computational fluid dynamics software or abbreviated as CFD [8][9][10][11][12].…”