This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Application of Computational Fluid Dynamics to the Study of Conditions Relevant to Autoignition Damage in Engines
Annotation ability available
Sector:
Language:
English
Abstract
The process of autoignition in an internal combustion engine cylinder produces large amplitude high frequency gas pressure waves accompanied by significant increases in gas temperature and velocity, and as a consequence large convective heat fluxes to piston and cylinder surfaces. Extended exposure of these surfaces to autoignition, results in their damage through thermal fatigue, particularly in regions where small clearances between the piston and cylinder or cylinder head, lie in the path of the oscillatory gas pressure waves.
The ability to predict spatial and temporal' variations in cylinder gas pressure, temperature and velocity during autoignition and hence obtain reasonable estimates of surface heat flux, makes it possible to assess levels of surface fatigue at critical zones of the piston and cylinder head, and hence improve their tolerance to autoignition.
In this paper Computational Fluid Dynamics (CFD) has been used to study conditions of severe autoignition in a spark ignition engine, particularly in regions where piston to cylinder or cylinder head clearances are small. It is shown that very high pressures are generated in regions of small clearance as supersonic pressure waves are decelerated as they enter these spaces.
Recommended Content
Authors
Topic
Citation
Dent, J., Das, S., and Blunsdon, C., "Application of Computational Fluid Dynamics to the Study of Conditions Relevant to Autoignition Damage in Engines," SAE Technical Paper 961963, 1996, https://doi.org/10.4271/961963.Also In
References
- Halstead M. P. Kirsch L.. J. Quinn C. P. “The Autoignition of Hydrocarbon fuels at High Temperatures and Pressures - Fitting a Mathematical Model” Comb. and Flame 20 45 1977
- Morse P. M. Ingard K. U. Theoretical Acoustics McGraw-Hill New York 1978
- Lee W. Schaefer H. J. Analysis of Local Pressures, Surface Temperatures and Engine Damage Under Knock Conditions” SAE Paper No 830508 1983
- Stephens R. W. B. Bate A. E. “Acoustics and Vibrational Physics” Arnold Edward London 1966
- Hayashi T. Taki M. Kojima S. Kondo T. “Photographic Observation of Knock with a Rapid Compression Machine” SAE Paper No 841336 1984
- Spicher U. Kollmeier H. P. “Detection of Flame Propagation During Knocking Combustion by Optical Fibre Diagnostics” SAE Paper No 861532
- Maly R. R. Klein R. Peters N. König G. “Theoretical and Experimental Investigation of Knock Induced Surface Destruction” SAE Paper No 900025 1990
- Smith R. P. Sprenger D. H. “Combustion Instability in Solid Propellant Rockets” 4th Symp. (International) on Combustion 1952
- Hickling R. Chen F. Feldmaier D. A. “Pressure Pulsations in Engine Cylinders” Engine Noise Excitation, Vibration and Radiation Hickling R. Kamal M.M. Plenum Press London 1982
- Hickling R. Feldmaier D. A. Sung S. H. “Knock Induced Cavity Resonances in Open Chamber Diesel, Engines” J. Acoust. Soc. Am 65 6 1474 1979
- Blunsdon C. A. Dent J. C. “The Simulation of Autoignition and Knock in a Spark Ignition Engine with Disk Geometry” SAE Paper No 940524 1994
- Liiva P. M. Liiva P. M. Valentine J. N. Cobb J. M. Acker W. P. “Use of Multiple Pressure Transducers to find in Cylinder Knock Location” SAE Paper No 922368 1992
- Curry S. “A Three Dimensional Study of Flame Propagation in a Spark Ignition Engine” SAE Trans. 71 628 1963
- Konig G. Sheppard C. G. W. “End Gas Autoignition and knock in a Spark Ignition Engine” SAE Paper No 902135 1990
- Eyzat P. Trapy J. “Thermal Transports - Characterisation of Increase in Thermal Exchanges in Spark Ignition Engines Operating with Knock” C.R. Acad. Sc. Paris Oct. 1982
- Lu J. H. Ezekoye D. liyama A. Greif R. Sawyer R.F. “Effect of Knock on Time-Resolved Engine Heat Transfer” SAE Paper No 890158 1989
- Kreith F. Bohn M. S. Principles of Heat Transfer 5th West Publishing Company St Paul 1993
- Nates R. J. Yates A. D. B. “Knock Damage Mechanisms in Spark Ignition Engines” SAE Paper No 942064 1994
- Betz G. Elermann J. “Knock Related Piston Damage in Gasoline Engines, Knock Measurement Techniques, Aspects of Knock Failure” Int. Symp. on Knocking Combustion Engines Wolfsburg 1981
- Boehm G. Harrer J. “Nickel Coated Pistons for Improved Durability in Knock Control Engines” SAE Paper No 900453 1990
- Amsden A. A. O′Rourke P. J. Butler T. D. KIVA-II: A Computer Program for Chemically Reactive Flows” Los Alamos National Laboratory Report LA-11560-MS 1989
- Hirst S. L. Kirsch L. J. The Application of a Hydrocarbon Autoignition Model Simulating Knock and Other Engine Phenomena” Combustion Modelling in Reciprocating Engines Mattavi J.M. Amann C .A. Plenum Press London 1980
- Ramos J. I. “Internal Combustion Engine Modelling” Hemisphere Publishing Corp. New York 1989
- French C. C. J. Atkins K. A. “Thermal Loading of a Petrol Engine” Proc. IMechE 187 1973
- Betts W. E. “Avoiding High Speed Knock Engine Failures” Int. Symp. on Knocking Combustion Engines Wolfsburg 1981
- Shapiro A. H. The Dynamics and Thermodynamics of Compressible Fluid Flow I The Ronald Press Co. New York 1953
- Karplus W. A. “Analog Simulation -Solution of Field Problems” McGraw Hill New York 1958
- Isakoff S. E. “Analysis of Unsteady Fluid Flow Using Direct Electrical Analogs” Industrial an Engineering Chemistry 47 5 1955
- Veribest Analogue Design Tools Veribest International plc UK
- McNaughton W. P. Richman R. H. Beaupre G. “Strain History and Hysteresis Effects for Elastic-Plastic Materials Subject to Cyclic Contacts Phil. Mag A 3 65 531 1992