This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Carbureted SI Engine Air Flow Measurements
Technical Paper
2016-01-1082
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Measurement of internal combustion engine air flow is challenging due to the required modification of the intake system and subsequent change in the air flow pattern. In this paper, various surge tank volumes were investigated to improve the accuracy of measuring air flow rate into a 674-cm3, four-stroke, liquid-cooled, internal combustion engine. According to the experimental results, when the venturi meter is used to measure the intake air flow rate, an air surge tank is required to be installed downstream of the venturi to smoothen the air flow. Moreover, test results revealed that increasing air surge tank volume beyond a limit could have a negative effect on the engine performance parameters especially in carbureted engines where controlling AFR is difficult. Although the air flow rate into the engine changed with increasing tank volume, the air-fuel ratio was leaner for smaller tank volumes. The volume of the air surge tank showed its greatest influence on the engine performance parameters when the throttle valve was approaching the wide-open position. The test results showed that a surge tank volume of about 10 to 11 times the engine displacement gave the most accurate air flow results compared to the engine without installing any surge tank, especially at higher engine speed and load.
Authors
Citation
Afkhami, B., Zhao, Y., Miers, S., and loesche, J., "Carbureted SI Engine Air Flow Measurements," SAE Technical Paper 2016-01-1082, 2016, https://doi.org/10.4271/2016-01-1082.Also In
References
- Lumley J.L. Engines an Introduction Cambridge University Press 1999
- Heywood J.B. Internal Combustion Engine Fundamentals Mc-Graw Hill Inc. 1988
- Blair , G. Design and Simulation of Four-Stroke Engines Warrendale Society of Automotive Engineers, Inc. 1999 978-0-7680-2555-2/R-186
- Hamilton , L. and Lee , J. The Effects of Intake Plenum Volume on the Performance of a Small Normally Aspirated Restricted Engine, SAE Int. J. Engines 1 1 1312 1318 2009 10.4271/2008-01-3007
- Samuel , J. , NS , P. , and Annamalai , K. Effect of Variable Length Intake Manifold on a Turbocharged Multi-Cylinder Diesel Engine SAE Technical Paper 2013-01-2756 2013 10.4271/2013-01-2756
- Jemni M.A. , Kantchev G. , Abid M.S. Influence of Intake Manifold Design on In-cylinder Flow and Engine Performances in a Bus Diesel Engine Converted to LPG Gas Fuelled, Using CFD Analyses and Experimental Investigations Int. J. Energy 2011 36 2701 2715
- Harrison M.F. , De Soto I. , Rubio Unzueta P.L. A Linear Acoustic Model for Multi-cylinder IC Engine Intake Manifolds Including the Effects of the Intake Throttle J. Sound and Vibration 2004 278 975 1011
- Sakowitz A. , Mihaescu M. , Fuchs L. Flow Decomposition Methods Applied to the Flow in an IC Engine Manifold J. Applied Thermal Engineering 2014 65 57 65
- Shahbakhti M. , Amini M.R. , Li J. , Asami S. , Hedrick J.K. Early Model-Based Design and Verification of Automotive Control System Software Implementations ASME Journal of Dynamic Systems, Measurement and Control 14 137 2 Feb. 2015
- Amini , M. , Shahbakhti , M. , and Ghaffari , A. A Novel Singular Perturbation Technique for Model-Based Control of Cold Start Hydrocarbon Emission, SAE Int. J. Engines 7 3 1290 1301 2014 10.4271/2014-01-1547
- Pai , D. , Singh , H. , and Muhammed , P. Simulation Based Approach for Optimization of Intake Manifold SAE Technical Paper 2011-26-0074 2011 10.4271/2011-26-0074
- Ceviz M.A. Intake Plenum Volume and its Influence on the Engine Performance, Cyclic Variability and Emissions Int. J. Energy Conversion and Management 2007 48 961 966
- Bates , S. Flame Imaging Studies in a Spark-Ignition Four-Stroke Internal Combustion Optical Engine SAE Technical Paper 890154 1989 10.4271/890154
- Ceviz M.A. , Akin M. Design of a New SI Engine Intake Manifold with Variable Length Plenum Int. J. Energy Conversion and Management 2010 51 2239 2244
- Bueno André V. , Velásquez José A. , Milanez Luiz F. Internal Combustion Engine Indicating Measurements Applied Measurement Systems Haq Zahurul Prof. 2012 978-953-51-0103-1 InTech