This content is not included in your SAE MOBILUS subscription, or you are not logged in.
A Simple Approach for the Estimation of the Exhaust Noise Source at the Valves
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 09, 2019 by SAE International in United States
Annotation ability available
Exhaust noise emission is the result of the propagation of pressure perturbations along the exhaust line, whose primary source is the instantaneous mass flow rate across the exhaust valves. In this paper, a model for the estimation of this magnitude is presented, which has two main objectives: the first one is to provide a representation of the engine as an exhaust noise source as independent as possible on the exhaust system; the second one to allow for the estimation of the exhaust mass flow in such cases where the full set of data required by a conventional gas-dynamic simulation is not available. The model presented uses a reduced set of geometrical and operation data, which can be either representative for a given engine family, or even target values for an engine still not fully defined. It is based on the estimation of in-cylinder variables at exhaust opening by means of a First-Law approach to the closed cycled, starting from rather general data on the energy balance of the engine. Then, conventional gas-dynamic equations are solved, but with the assumption of an anechoic termination downstream of the exhaust valve, so that the results are rendered independent of the particular exhaust geometry. The results of the model are validated against those of a conventional gas-dynamic code, showing that any differences lie within acceptable limits if the purpose is the assessment of the exhaust noise source.
|Technical Paper||Electronic Ignition Control|
|Technical Paper||Development of Exhaust Silencer for Improved Sound Quality and Optimum Back Pressure|
CitationTorregrosa, A., Olmeda, P., Adam, J., Morin, F. et al., "A Simple Approach for the Estimation of the Exhaust Noise Source at the Valves," SAE Technical Paper 2019-24-0174, 2019, https://doi.org/10.4271/2019-24-0174.
- Takeyama , S. , Takeda , H. , and Takagi , Y. Reduction in Exhaust Noise through Exhaust Valving Modifications Achieved with a Gas Dynamics Simulation Model SAE Technical Paper 910617 1991 10.4271/910617
- Seldon , W. , Shoeb , A. , Schimmel , D. , and Cromas , J. Experimental GT-POWER Correlation Techniques and Best Practices Low Frequency Acoustic Modeling of the Exhaust System of a Naturally Aspirated Engine SAE Technical Paper 2017-01-1793 2017 10.4271/2017-01-1793
- Seldon , W. , Hamilton , J. , Cromas , J. , and Schimmel , D. Experimental GT-POWER Correlation Techniques and Best Practices Low Frequency Acoustic Modeling of the Intake System of a Turbocharged Engine SAE Technical Paper 2017-01-1794 2017 10.4271/2017-01-1794
- Gonzalez , D.M. and Di Nunno , D. Internal Exhaust Gas Recirculation for Efficiency and Emissions in a 4-Cylinder Diesel Engine SAE Technical Paper 2016-01-2184 2016 10.4271/2016-01-2184
- Boden , H. Recent Advances in IC-Engine Exhaust and Intake System Acoustic Source Characterization SAE Technical Paper 2012-36-0611 2012 10.4271/2012-36-0611
- Brunel , J. A New Experimental Method to Study the Exhaust Process of an IC Engine SAE Technical Paper 925065 1992
- Torregrosa , A.J. , Broatch , A. , and Payri , R. On the Influence of Manifold Geometry on Exhaust Noise SAE Technical Paper 1999-01-1650 1999 10.4271/1999-01-1650
- Morel , T. , Silvestri , J. , Goerg , K. , and Jebasinski , R. Modeling of Engine Exhaust Acoustics SAE Technical Paper 1999-01-1665 1999 10.4271/1999-01-1665
- Torregrosa , A.J. , Fajardo , P. , Gil , A. , and Navarro , R. Development of Non-Reflecting Boundary Condition for Application in 3D Computational Fluid Dynamic Codes Engineering Applications of Computational Fluid Mechanics 6 3 447 460 2012 10.1080/19942060.2012.11015434
- Benson , R.S. The Thermodynamics and Gas Dynamics of Internal-Combustion Engines Oxford Oxford University Press 1982 978-0198562108