This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Evaluation of Positive-Displacement Supercharging and Waste Heat Recovery for an LHR Diesel
Annotation ability available
Sector:
Language:
English
Abstract
One demonstrated method for improving the shaft thermal efficiency of turbocharged heavy-duty diesel engines is turbo-compounding--the incorporation of a power turbine, geared to the engine output shaft, which can supply additional power extracted from the exhaust. An alternative approach is to use a screw-type positive displacement compressor/expander geared to the engine output shaft, as a substitute for both the turbocharger and power turbine. One concept for the latter approach was described in recent literature, with an accompanying analysis indicating a significant advantage over turbo-machinery at full load. The present paper reports the results of a more detailed comparative analysis between this screw-machine and turbomachinery when applied to supercharging and waste heat recovery in heavy duty diesels. These comparisons are developed through the use of an engine system simulation code and are examined for both full load and part load cases, including curb idle. In order to extend this analysis to advanced diesel engine designs, comparisons also are developed for a highly insulated configuration. The results show that at high loads the screw machine has an advantage over turbomachinery but that at part loads and curb idle the reverse situation exists. Insulation is found to have negligible effect on the relative merits of the two types of systems.
Recommended Content
Authors
Citation
Fort, E., Blumberg, P., and Wood, J., "Evaluation of Positive-Displacement Supercharging and Waste Heat Recovery for an LHR Diesel," SAE Technical Paper 870026, 1987, https://doi.org/10.4271/870026.Also In
SAE 1987 Transactions Alternative Engines and Engine Components and Systems
Number: V96-5; Published: 1988-09-01
Number: V96-5; Published: 1988-09-01
References
- Hoehne J. L. Werner J. R. “The Cummins Advanced Turbocompound Diesel Engine Evaluation” NASA Report CR-168042 December 1982
- Sekar R. Kamo R. “Positive Displacement Compounding of a Heavy Duty Diesel Engine” NASA Report CR-168286 November 1983
- Wurm J. Kinast J. A. Bulicz T. “Assessment of Positive Displacement Supercharging and Compounding of Adiabatic Diesel” SAE Paper 840430 1984
- Morel T. et.al. “Examination of Key Issues in Low Heat Rejection Engines” SAE Paper 860316 1986
- Wichert K. E. “Characteristics of Helical, Rotary, Positive Displacement Compressors” ASME Paper 61-HYD-18 1961