This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Cyclical Thermal Phenomena in Engine Combustion Chamber Surfaces
Annotation ability available
Sector:
Language:
English
Abstract
The heat flux from the gases to the walls of I.C. engines is highly transient, producing temperature transients in thin layers of the walls adjacent to the combustion chamber. The resulting surface temperature swings affect engine performance, and also increase the maximum temperature of the engine components. To analyze these effects, a one-dimensional, time-dependent heat conduction model was developed, with the capability to handle layered or laminated walls and temperature-dependent material properties. The model is driven by a thermodynamic cycle code coupled to a steady-state heat conduction model of the engine structure. A parametric study was carried out in which boundary conditions representing a heavy duty diesel engine were applied to materials with a wide range of thermal properties. The calculated results include the swing amplitudes, net heat flux, and “pumped heat,” a quantity describing heat stored temporarily in the walls and rejected back to combustion gases within each cycle.
Recommended Content
Authors
Topic
Citation
Morel, T., Keribar, R., and Blumberg, P., "Cyclical Thermal Phenomena in Engine Combustion Chamber Surfaces," SAE Technical Paper 850360, 1985, https://doi.org/10.4271/850360.Also In
References
- Bradish, J. P. Myers, P. S. Uyehara, O. A. 1966 “Effects of Deposit Properties on Volumetric Efficiency, Neat Transfer and Preignition in Internal Combustion Engines,” SAE Paper 660130
- Cawley, J. D. 1984 “Overview of Zirconia with Respect to Gas Turbine Applications,” NASA Technical Paper 2286 NASA Lewis R.C.
- Goldsmith, A. Waterman, T. E. Hirschhorn, H. J. “Handbook of Thermophysical Properties of Solid Materials, Volume III: Ceramics,” The MacMillan Company New York 1961 932 931
- Morel, T. Fort, E. F. Blumberg, P. N. 1985 “Effect of Insulation Strategy and Design Parameters on Diesel Engine Heat Rejection and Performance” SAE Congress 1985 Detroit, Michigan
- Morel, T. Keribar, R. 1985 “A Model for Predicting Spatially and Time Resolved Convective Heat Transfer in Bowl-in-Piston Combustion Chambers” SAE Congress 1985 Detroit Michigan
- Shamah, E. 1967 “Unsteady Heat Transfer Simulation for a Diesel Engine,” University of Wisconsin
- Wallace, F. J. Way, R. J. B. Vollmert, H. 1979 “Effect of Partial Suppression of Heat Loss to Coolant on the High Output Diesel Engine Cycle,” SAE Paper 790823