Low Heat Rejection Diesel Engines
When compared with conventional diesel engines, Low Heat Rejection (LHR) engines have the following features. Fuel economy is improved by 5 to 10 percent in turbocharged engines, or 9 to 15 percent with turbocompounding. Power is reduced by up to 25 percent in naturally-aspirated engines, but this loss can be recovered by pressure boosting. NOx emissions data vary widely, but it is concluded that they will be increased by an average value of 15 percent. However, HC and CO emissions will be reduced by up to 50 percent. Smoke levels should be reduced and particulates will be reduced by up to 80 percent. Noise levels should be reduced and there should be improved capability for operation with low cetane fuels.
Problems to be solved include high temperature lubrication and high temperature materials.
KeywordsDiesel Engine Fuel Economy Ignition Delay Cetane Number Volumetric Efficiency
Unable to display preview. Download preview PDF.
- 1.R. H. Thring, “Adiabatic Diesel Engines,” Fourth Quarterly Report, SwRI Project No. 03–8011, March 1985.Google Scholar
- 2.J. F. Tovell, “The Reduction of Heat Losses to the Diesel Engine Cooling System,” SAE Paper 830316.Google Scholar
- 3.P. A. Watts and J. B. Heywood, “Simulation Studies of the Effects of Turbocharging and Reduced Heat Transfer on Spark-Ignition Engine Operation,” SAE Paper 800289.Google Scholar
- 4.R. M. Kamo, M. Woods, T. Yamada and M. Mori, “Thermal Barrier Coating for Diesel Engine Piston,” ASME Paper 80-DGP-14.Google Scholar
- 5.T. Yoshimitsu, K. Toyama, F. Sata and H. Yamaguchi, “Capabilities of Heat Insulated Diesel Engine,” SAE Paper 820431.Google Scholar
- 6.M. N. Savliwala and N. S. Hakim, “Statistically Optimized Performance Predictions of Low Heat Rejection Engines with Exhaust Recovery,” SAE Paper 860315.Google Scholar
- 7.K. Toyama, T. Yoshimitsu, T. Nishiyama, T. Shamauchi and T. Nakagaki, “Heat Insulated Turbocompound Engine,” SAE Paper 831345.Google Scholar
- 8.R. Kamo and W. Bryzik, “Adiabatic Turbocompound Diesel Engine,” ASME Paper 84-DGP-16.Google Scholar
- 9.F. J. Wallace, T. K. Kao, W. D. Alexander, A. Cole and M. Tarabad, “Thermal Barrier Pistons and Their Effect on the Performance of Compound Diesel Engine Cycles,” SAE Paper 830312.Google Scholar
- 10.A. C. Alkidas, “The Influence of Partial Suppression of Heat Rejection on the Performance and Emissions of a Divided-Chamber Diesel Engine,” SAE Paper 860309.Google Scholar
- 11.R. H. Thring, “Low Heat Rejection Engines,” SAE Paper 860314.Google Scholar
- 12.S. Timoney, and G. Flynn, “A Low Friction, Unlubricated SiC Diesel Engine,” SAE Paper 830313.Google Scholar
- 13.W. Bryzik, and R. Kamo, “TACOM/Cummins Adiabatic Engine Program,” SAE Paper 830314.Google Scholar
- 14.D. C. Siegla, and C. A. Amann, “Exploratory Study of the LowHeat-Rejection Diesel for Passenger-Car Application,” SAE Paper 840435.Google Scholar
- 15.W. R. Wade, P. H. Haystad, E. J. Ounsted, F. H. Trinkler and I. J. Garwin, “Fuel Economy Opportunities with an Uncooled DI Diesel Engine,” SAE Paper 841286.Google Scholar