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An Analytical Assessment of the CO2 Emissions Benefit of Two-Stroke Diesel Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 5, 2016 by SAE International in United States
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Two-stroke diesel engines could be a promising solution for reducing carbon dioxide (CO2) emissions from light-duty vehicles. The main objective of this study was to assess the potential of two-stroke engines in achieving a substantial reduction in CO2 emissions compared to four-stroke diesel baselines. As part of this study 1-D models were developed for loop scavenged two-stroke and opposed piston two-stroke diesel engine concepts.
Based on the engine models and an in-house vehicle model, projections were made for the CO2 emissions for a representative light-duty vehicle over the New European Driving Cycle and the Worldwide Harmonized Light Vehicles Test Procedure. The loop scavenged two-stroke engine had about 5-6% lower CO2 emissions over the two driving cycles compared to a state of the art four-stroke diesel engine, while the opposed piston diesel engine had about 13-15% potential benefit. Opposed piston two-stroke engines offer the potential for even higher thermal efficiency than loop scavenged two-stroke engines. The efficiency advantages of the opposed piston two-stroke engine are mainly because of lower in-cylinder heat losses due to elimination of the cylinder head and lower surface area to volume ratio.
The thermal efficiency of a loop scavenged two-stroke engine can be potentially further improved by using thermal barrier materials for incylinder surfaces to minimize heat losses. Analytical studies show that integration of thermal barrier materials and two-stroke loop scavenged engine could lead to a cost effective highly efficient diesel engine. Whether the theoretical benefit translates to actual CO2 emissions reduction will have to be verified experimentally.
CitationWarey, A., Gopalakrishnan, V., Potter, M., Mattarelli, E. et al., "An Analytical Assessment of the CO2 Emissions Benefit of Two-Stroke Diesel Engines," SAE Technical Paper 2016-01-0659, 2016, https://doi.org/10.4271/2016-01-0659.
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