This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Shock Wave Development and Propagation in Automobile Exhaust Systems
Annotation ability available
Sector:
Language:
English
Abstract
For the purpose of exhaust noise reduction in an automobile engine, an experimental investigation was carried out to confirm the existence of shock waves in the exhaust system. Pressure measurments were conducted along the exhaust pipe of an in-line 4-cycle automobile engine, and the results clearly show that the compression waves at the exhaust port of the engine develop into the shock waves as they propagate in the exhaust pipe with the engine running at high speed. This nonlinear developing process of the shock wave was numericaly simulated using 2-dimentional unsteady Euler equations. Flow visualization study was also conducted using holographic interpherometer in order to prove the existence of shock waves in the exhaust pipe, and shock waves of Mach 1.1 were observed.
Consequently, it is found that the nonlinear effects in the compression wave development should be taken into account in the design phase of the engine muffler.
Recommended Content
| Technical Paper | Decay of Shock Waves Propagating in a Kinked Exhaust Pipe |
| Technical Paper | A Study on the Relation Between Pulsating Flow and the Noise |
| Technical Paper | Study of the Generation mechanism for Abnormal Exhaust Noise |
Authors
Topic
Citation
Sekine, N., Matsumura, S., Takayama, K., Onodera, O. et al., "Shock Wave Development and Propagation in Automobile Exhaust Systems," SAE Technical Paper 880082, 1988, https://doi.org/10.4271/880082.Also In
References
- Harten A. High Resolution Schemes for Hyperbolic Concervation Luws J. Camputational Physics 49 357 393 1983
- Yee H. C. Warming R. F. Harten A. Implicit Total Variation Diminishing (TVD) Schemes for Steady-State Calculations J. Computational Physics 57 327 360 1985
- Benson R. S. The Thermodynamics and Gas Dynamics of Internal Combustion Engines 1 1982 Oxford Sience Publication
- Liepman W. H. Roshko Element of Gas Dynamics 1960 John Wiley & Sons, Inc.
- Takayama K. Proc. SPIE, Industrial Applications of Laser Technology 398 1983 174
- Itoh K. Takayama K. Theoretical and Appl. Mech 35 1987 27
- Sekine N. Matsumura S. et al. Initiation and Propagation of shock waves in the exhaust pipe of an internal combustion engine Proc. JSME. No. 87-0717B 1987