This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Improved Parametric Expressions for Acoustic Source Strength Level and Impedance of Turbocharged Diesel Engine Exhaust System
Technical Paper
2019-26-0218
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
The present article aims at a possible integration of design of an engine with the muffler to ensure adequate overall insertion loss (IL) of the muffler. Acoustic source characteristics of the engine exhaust system of turbocharged diesel generator (DG) sets running at a fixed shaft speed are estimated using a recently developed novel direct evaluation method. Each cylinder of a multi-cylinder engine is modelled individually as an acoustic source, which allows estimation of the source characteristics for different arrangements of exhaust runners. Parametric expressions of the acoustic source strength level (SSL) and the internal impedance of each cylinder are proposed for full load condition of a 4-cylinder and a 6-cylinder turbocharged (TC) engines. Using the appropriate transfer and combination of source strength level (with proper phase) and source impedance, source characteristics of the complete engine are computed. These source characteristics are used to predict the unmuffled exhaust SPL spectrum which compares well with the measured spectrum. The methodology described here for the DG set engines can be readily extended to automotive engines.
Recommended Content
Authors
Citation
Kumar, K. and Munjal, M., "Improved Parametric Expressions for Acoustic Source Strength Level and Impedance of Turbocharged Diesel Engine Exhaust System," SAE Technical Paper 2019-26-0218, 2019, https://doi.org/10.4271/2019-26-0218.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 |
Also In
References
- Munjal , M.L. Acoustics of Ducts and Mufflers Second Chichester, UK Wiley 2014
- Kathuriya , M.L. and Munjal , M.L. A Method for the Experimental Evaluation of the Acoustic Characteristics of an Engine Exhaust System in the Presence of Mean Flow J. Acoust. Soc. Am. 60 3 745 751 1976
- Kathuriya , M.L. and Munjal , M.L. Experimental Evaluation of the Aeroacoustic Characteristics of a Source of Pulsating Gas Flow J. Acoust. Soc. Am. 65 1 240 248 1979
- Desmons , L. , Hardy , J. , and Auregan , Y. Determination of the Acoustical Source Characteristics of an Internal Combustion Engine by Using Several Calibrated Loads J. Sound Vib. 179 5 869 878 1995
- Bodén , H. On Multi-Load Methods for Determination of the Source Data of Acoustic One-Port Sources J. Sound Vib. 180 5 725 743 1995 10.1006/jsvi.1995.0111
- Jang , S.-H. and Ih , J.-G. Refined Multiload Method for Measuring Acoustical Source Characteristics of an Intake or Exhaust System J. Acoust. Soc. Am. 107 6 3217 3225 2000
- Prasad , M.G. and Crocker , M.J. Acoustical Source Characterization Studies on a Multi-Cylinder Engine Exhaust System J. Sound Vib. 90 4 479 490 1983
- Ross , D.F. and Crocker , M.J. Measurement of the Acoustic Internal Source Impedance of an Internal Combustion Engine J. Acoust. Soc. Am. 74 1 18 27 1983
- Kumar , K.M. and Munjal , M.L. A Simple Novel Method for Direct Evaluation of the Acoustic Source Impedance of the Exhaust System of a Single Cylinder Engine 24th International Congress on Sound and Vibration, ICSV 2017 2017
- Kumar , K.M. and Munjal , M.L. Direct Estimation and Experimental Validation of the Acoustic Source Characteristics of Two-Cylinder Naturally Aspirated Diesel Engine Exhaust System Appl. Acoust. 135 70 84 2018 10.1016/j.apacoust.2018.01.022
- Kumar , K.M. and Munjal , M.L. Direct Estimation and Experimental Validation of the Acoustic Source Characteristics of 4-Cylinder Turbocharged Diesel Engine Exhaust System 13th Western Pacific Acoustics Conference New Delhi 1 6 2018
- Peat , K.S. , Elasari , M. , and Dequand , S. A Linear Acoustic Model of the Passive Acoustic Effect of the Turbine in an Automotive Turbocharger International Congress on Sound and Vibration Stockholm, Sweden 2003
- Peat , K.S. , Torregrosa , A.J. , Broatch , A. , and Fernández , T. An Investigation into the Passive Acoustic Effect of the Turbine in an Automotive Turbocharger J. Sound Vib. 295 60 75 2006 10.1016/j.jsv.2005.11.033
- Tiikoja , H. , Rämaal , H. , Abom , M. , and Bodén , H. Test-Rig for Complete Acoustic Characterization of Turbochargers Proceedings of 16th AIAA/CEAS Aeroacoustics Conference 2010
- El Nemr , Y. , Veloso , R. , Girstmair , J. , Kabral , R. et al. Experimental Investigation of Transmission Loss in an Automotive Turbocharger Compressor under Ideal and Real Engine Operating Conditions 12th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Stockholm, Sweden 1 12 2017 10.29008/ETC2017-298
- Kumar , K.M. 2018
- Hota , R.N. and Munjal , M.L. Approximate Empirical Expressions for the Aeroacoustic Source Strength Level of the Exhaust System of Compression Ignition Engines Int. J. Aeroacoustics 7 3 349 371 2008
- Munjal , M.L. and Doige , A.G. On Uniqueness, Transfer and Combination of Acoustic Sources in One-Dimensional Systems J. Sound Vib. 121 1 25 35 1988 10.1016/S0022- 460X(88)80058-0