This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Computational Aeroacoustics of Mufflers for Exhaust Air Rush Prediction and Experimental Validation
Technical Paper
2017-01-1311
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Air rush noise is exhaust gas driven flow-induced noise in the frequency range of 500-6500 Hz. It is essential to understand the flow physics of exhaust gases within the mufflers in order to identify any counter measures that can attenuate this error state. This study is aimed at predicting the flow physics and air rush noise of exhaust mufflers in the aforementioned frequency range at a typical exhaust flow rate and temperature. The study is performed on two different muffler designs which show a significant air rush noise level difference when tested on the vehicle. The transient computational study was performed using DES with 2nd order spatial discretization and 2nd order implicit scheme for temporal discretization in StarCCM+. To compare with test data, a special flow test stand is designed so that all high and low frequency contents emanating from the engine are attenuated before the flow enters the test part. Also, the flow pulsation is dampened before entering the test parts to agree closely with CFD boundary conditions. The predicted air rush noise from CFD study exhibited good agreement with the experimental results.
Recommended Content
Technical Paper | Advanced Design of Automotive Exhaust Silencer Systems |
Technical Paper | Muffler Selection and Design for Internal Combustion Engines |
Technical Paper | Identification of AeroAcoustic Noise Sources Using Inverse Boundary Element Method |
Authors
Citation
Mishra, S., Gummadi, N., Bozzi, L., Vaughn, N. et al., "Computational Aeroacoustics of Mufflers for Exhaust Air Rush Prediction and Experimental Validation," SAE Technical Paper 2017-01-1311, 2017, https://doi.org/10.4271/2017-01-1311.Also In
References
- Kanai , K. and Katsuyama , H. The Predictive Simulation of Exhaust Pipe Narrow-band Noise SAE Int. J. Passeng. Cars -Mech. Syst. 8 1 82 91 2015 10.4271/2015-01-1329
- Bogey , C. , Bailly , C. Computation of a high Reynolds number jet and its radiated noise using large eddy simulation based on explicit filtering Computers & Fluids 35 1344 1358 2006 10.1016/j.compfluid.2005.04.008
- DeBonis , J. R. Progress Towards Large-Eddy Simulations for Prediction of Realistic Nozzle Systems presented at 44 th AIAA Aerospace Science Meeting and Exhibit 2004 10.2514/6.2006-487
- Uzun , A. , Blaisdell , G. A. , Lyrintzis , A. S. 3-D Large Eddy Simulation for Jet Aeroacoustics presented at 9 th AIAA/CEAS Aeroacoustics Conference 2003 10.2514/6.2003-3322
- Uzun , A. , Lyrintzis , A. S. , Blaisdell , G. A. Coupling of Integral Acoustics Methods with LES for Jet Noise Prediction presented at 42 nd AIAA Aerospace Sciences Meeting and Exhibit 2004 10.2514/6.2004-517