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Low Heat Rejection Engine Research Status: Where Do We Go from Here?
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A study is carried out here to examine the probable causes for the seemingly contradictory results found in the present-day literature on low-heat-rejection (LHR) engines, provide plausible explanations, and indicate possible directions for future research. Almost all numerical studies predict improved thermal efficiency, increased availability in the exhaust, and reduced in-cylinder heat rejection in the case of LHR engines. The degree of improvement varies considerably from a few percentage points to several, depending on the extent of insulation and whether or not turbocompounding and Rankine bottoming cycle are included. In these simulations, care is taken not to allow the volumetric efficiency to decrease due to higher cylinder temperatures in LHR engines. In addition, air-fuel ratio and, in many instances, peak conditions are maintained constant in both the LHR and conventionally-cooled engines. One experimental investigation, which has followed the above conditions, has shown considerable improvement in fuel consumption over conventionally-cooled engines. Some other experimental studies which have not followed these conditions indicate that LHR engines are poor performers. In fact, some of the engines used in the tests cannot even be classified as LHR engines as they have rejected more heat than the conventional ones. In the experiments where the volumetric efficiency is allowed to fall, combustion to degrade, peak conditions to alter, and in-cylinder heat rejection to increase, the LHR engine's performance naturally suffers. In conclusion, it appears significant improvements in thermal efficiency can be obtained by LHR engines relative to baseline engines. This fact is borne by numerous numerical simulations and also by the experiment which is carried under the proper constraints. To further validate this, more experiments, under the aforementioned conditions, are recommended on LHR engines built for this purpose rather than the existing ones improvised by component substitution.
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Reddy, C., Domingo, N., and Graves, R., "Low Heat Rejection Engine Research Status: Where Do We Go from Here?," SAE Technical Paper 900620, 1990, https://doi.org/10.4271/900620.Also In
References
- Cheng, W. K. Wong, V. W. Gao, F. “Heat Transfer Measurement Comparisons in Insulated and Non-Insulated Diesel Engines,” SAE paper No. 890570 1989
- Woschni, G. Spindler, W. Kolesa, K. “Heat Insulation of Combustion Chamber Walls - A Measure to Decrease the Fuel Consumption of I.C. Engines?” SAE paper No. 870339 1987
- Cheng, W. R. Wong, V. W. “Does Heat Transfer Increase in Low Heat Rejection Engines? - A Discussion on the Recent Results from Woschni et al.,” proceedings of the 25th Automotive Technology Development Contractors' Coordination Meeting SAE 57 60 1987
- Havstad, P. H. Gervin, I. J. Wade, W. R. “A Ceramic Insert Uncooled Diesel Engine,” SAE paper No. 860447 1986
- Miyairi, Y. Matsuhisa, T. Ozawa, T. Oikawa, H. Nakashima, N. “Selective Heat Insulation of Combustion Chamber Wall, for a DI Diesel Engine with Monolithic Ceramics,” SAE paper No. 890141 1989
- Morel, T. Wahiduzzaman, S. Fort, E. F. “LHR Engine Design Analysis Methodology - Heat Transfer Measurements in an Insulated Diesel,” SAE paper No. 880186 1988
- Morel, T. Wahiduzzaman, S. Fort, E. F. Blumberg, P. N. “Methods for Heat Transfer and Field Analysis of the Insulated Diesel,” Phase III-Report No. DOE/NASA/0342-3 1988
- Toyama, K. Yoshimitsu, T. Nishiyama, T. Shimauchi, T. Nakagaki, T. “Heat Insulated Turbocompound Engine,” SAE paper No. 831345 1983
- Dickey, D. Vinyard, S. Callahan, T. Keribar, R. “The Effect of Insulated Diesel Surfaces on Performance, Emissions and Combustion,” proceedings of the 25th Automative Technology Development Contractors' Coordination Meeting SAE 49 56 1987
- Alkidas, A. C. “Performance and Emissions Achievements with an Uncooled Heavy Duty, Single Cylinder Diesel Engine,” SAE paper 890144 1989
- Wade, W. R. Havstad, P. H. Ounsted, E. J. Trinker, F. H. Garvin, I. J. “Fuel Economy Opportunities with an Uncooled DI Diesel Engine,” SAE paper No. 841286 1984
- Sudhakar, V. “Performance Analysis of Adiabatic Engines,” SAE paper No. 840481 1986
- Kamo, R. Bryzik, W. “Adiabatic Turbo-Compound Engine Performance Prediction,” SAE paper No. 780068 1978
- Moore, C. H. Hoehne, J. L. “Combustion Chamber Insulation Effect on the Performance of a Low Heat Rejection Cummins V-903 Engine,” SAE paper No. 860371 1986
- Morel, T. Keribar, R. Blumberg, P. N. Fort, E. F. “Examination of Key Issues in Low Heat Rejection Engines,” SAE paper No. 860316 1986
- Morel, T. Fort, E. F. Blumberg, P. N. “Effect of Insulation Strategy and Design Parameters on Diesel Engine Heat Rejection and Performance,” SAE paper No. 850506 1985
- Hoag, K. L. Brando, M. C. Bryzik, W. “Cummins/TACOM Adiabatic Engine Program,” SAE paper No. 850356 1985
- Tovell, J. F. “The Reduction of Heat Losses to the Diesel Engine Cooling System,” SAE paper No. 830316 1983
- French, C. C. J. “Ceramics in Reciprocating Internal Combustion Engines,” SAE paper No. 841135 1984
- Hoag, K. L. “A Perspective on Low Heat Rejection Diesel Engine Development,” proceedings of the 1987 Coatings for Advanced Heating Engines Workshop Castine, ME II-9 II-15 1987
- Watson, N. Kyratatos, N. P. Holmes, K. “The Performance Potential of Limited Cooled Diesel Engines,” Proc. I MechE. 197A 1983
- Wallace, F. J. Kao, T. K. Tarbad, M. Alexander, W. D. Cole, A. “Thermally Insulated Diesel Engines,” Proc. I MechE. 198A 5 1984
- Bennethum, J. E. Hakim, N. S. “The Low Heat Rejection (Adiabatic) Reference Engine Design for On-Highway Applications,” Proceedings of the 23rd Automative Technology Development Contractors' Coordination Meeting DOE 63 79 1985
- Assanis, D. N. “A Computer Simulation of the Turbocharged Turbocompound Diesel Engine System for Studies of Low Heat Rejection Engine Performance,” MIT 1985
- Annand, W. D. “Heat Transfer in the Cylinder of Reciprocating Internal Combustion Engines,” Proc. I MechE 177 36 1963
- Morel, T. Keribar, R. Wahiduzzaman, S. Fort, E. F. “LHR Engine Design Analysis Methodology and Validation,” proceeding of the 24th Automotive Technology Development Contractors' Coordination Meeting SAE 61 72 1986
- Morel, T. Keribar, R. Blumberg, P. N. Fort, E. F. “Methods for Heat Transfer and Thermal Analysis of Insulated Diesels,” proceedings of the 23rd Automatic Technology Development Contractors' Coordination Meeting SAE 81 97 1985
- Bruns, L. Bryzik, W. Kamo, R. “Performance Assessment of U.S. Army Truck with Adiabatic Diesel Engine,” SAE paper No. 890142 1989
- Wallace, F. J. Way, R.J.B. Vollmert, H. “Effect of Partial Suppression of Heat Loss to the Coolant on the High Output Diesel Engine Cycle,” SAE paper No. 790823 1979
- Furuhama, S. Enomoto, Y. “Heat Transfer into Ceramic Combustion Wall of Internal Combustion Engines,” SAE paper No. 870153 1987
- Germerdonk, R. Nguyen, N. N. “Increase of the Local Heat Transfer Coefficient by ‘Convection Vive’ Phenomenon,” German Chemical Engineering 8 1985 81 86 1985
- Griffiths, W. J. “Thermodynamic Simulation of the Diesel Engine Cycle to Show the Effect of Increasing Wall Temperatures on Thermal Efficiency and Heat Rejection,” Wellworthy Topics (England) 63 7 10 Winter 1976-77
- Zapf, H. “Limitations and Possibilities of Heat Tight Combustion Space in Diesel Engines,” VDI Berichte 238 85 87 1975
- Siegla, D. C. Amman, C. A. “Exploratory Study of the Low Heat Rejection Diesel for Passenger Car Applications,” SAE Paper No. 840435 1985
- Colgate, S. A. “Partial Adiabatic Cycle Heat Loss,” American Chemical Society Paper No. 869080 1986
- Primus, R. J. Hoag, K. L. Flynn, P. F. Brands, M. C. “ An Appraisal of Advanced Engine Concepts using Second Law Analysis Techniques,” SAE paper No. 841287 1984
- Obert, E. F. “Internal Combustion Engines and Air Pollution,” Harper and Row 174 1973
- Van Wylen, G. J. Sonntag, R. E. “Fundamentals of Classical Thermodynamics,” Second John Wiley and Sons 336 1973
- Yoshimitsu, T. Toyama, K. Sato, F. Yamaguchi, H. “Capabilities of Heat Insulated Diesel Engine,” SAE paper No. 820421 1982
- “Insulated Components,” Ricardo Document NSJ 18.2.88
- Cheng, W. Mechanical Engineering Department MIT Cambridge, MA 1988
- Hunter, C. E. Havstad, P. H. Garwin, I. J. Daby, E. E. “The Effect of Reduced Chamber Heat Loss on Combustion and Emission of Alternative Fuels in a Light-Duty DI Diesel,” SAE paper No. 881628 1988
- Reddy, C. S. Domingo, N. Graves. R. L. “A study of Adiabatic Engine Performance,” Oak Ridge National Laboratory