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Combustion and Performance Characteristics of a Low Heat Rejection Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1993 by SAE International in United States
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The purpose of this paper is to investigate combustion and performance characteristics for an advanced class of diesel engines which support future Army ground propulsion requirements of improved thermal efficiency, reduced system size and weight, and enhanced mobility. Advanced ground vehicle engine research represents a critical building block for future Army vehicles. Unique technology driven engines are essential to the development of compact, high-power density ground propulsion systems.
Through an in-house analysis of technical opportunities in the vehicle ground propulsion area, a number of dramatic payoffs have been identified as being achievable. These payoffs require significant advances in various areas such as: optimized combustion, heat release phasing, and fluid flow/fuel spray interaction. These areas have been analyzed in a fundamental manner relative to conventional and low heat rejection “adiabatic” engines. Of particular note, in the research being reported here complex interacting mechanisms within the low heat rejection (LHR) class of engine were seen to be extremely sensitive to heat release phasing and its breakdown between premixed and diffusion combustion. Small parameter changes can significantly enhance or degrade engine performance depending upon characteristics such as engine geometry, heat transfer, and fluid flow/chemical kinetic phasing interactions. These sensitivities are not nearly as great in conventional water cooled engines.
Studies to date reveal that while chemical kinetics form a critical dominance in a conventionally cooled engine, an LHR engine is more critically affected by mixing controlled phenomena. The LHR engine combination of 1) shortened ignition delay, and 2) diffusion mixing limitations, is responsible for producing longer heat release periods in non-optimized LHR engines. Experimental results to fundamentally understand and improve this characteristic will be presented.
CitationSchwarz, E., Reid, M., Bryzik, W., and Danielson, E., "Combustion and Performance Characteristics of a Low Heat Rejection Engine," SAE Technical Paper 930988, 1993, https://doi.org/10.4271/930988.
- Bryzik, W., and Kamo, R., “TACOM/Cummins Adiabatic Engine Program,” SAE Paper 830314, SAE Trans. Vol 92, 1983.
- Bryzik, W., and Kamo, R., “TACOM/Cummins Adiabatic Engine Program,” SAE Paper 840428, Feb 1984.
- Assanis, D., Wiese, K., Schwarz, E., and Bryzik, W., “The Effects of Ceramic Coatings on Diesel Engine Performance and Exhaust Emissions,” SAE Paper 910460, Feb 1991.
- Reddy, C. S., Domingo, N., and Graves, R. L., “Low Heat Rejection Engine Research Status: Where Do We Go from Here?” SAE Paper 900620, Feb 1990.
- Borman, G. L., Farrell, P. V., Foster, D. E., Martin, J. K., and Myers, P. S., “Development of a Modular Transient Cycle Analysis Program for the Adiabatic Diesel and Other Compound Diesel Engines,” University of Wisconsin, TACOM, RDT&E, Technical Report No 13558, pp. 57-71, June 1991.
- Brands, M., Hoenhe, J., and Moore, C., “TACOM Adiabatic Engine Program Review,” 4 Oct 1984.
- Alkidas, A.C., “Performance and Emission Achievements with an Uncooled, Heavy Duty Single Cylinder Diesel Engine,” SAE 890144, Feb 1989.
- Gatowski, J. A., “Evaluation of a Selectively Cooled, Single Cylinder, 0.5 L Diesel Engine,” SAE 900693, Feb 1990.
- Dickey, D. W., “The Effect of Insulated Combustion Chamber Surfaces on Direct Injected Diesel Engine Performance, Emissions and Combustion,” SAE 890292, Feb 1989.
- Morel, T., Wahiduzzaman, S., and Fort, E. F., “Heat Transfer Experiments in an Insulated Diesel,” SAE 880186, Feb 1988.
- Woods, M., Schwarz, E., and Bryzik, W., “Heat Rejection from High Output Adiabatic Diesel Engine,” SAE 920541, Feb 1992.