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MTBE for Improved Diesel Combustion and Emissions?
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Abstract
Reduced emissions from the spark-ignition engine, when fueled by gasoline containing small amounts of MTBE, have led us to explore similar positive results in compression-ignition (CI) engine combustion by adding this oxygenate compound to Diesel fuel. This study was performed in two separate laboratories by employing the respective experimental apparatus.
When a pre-chamber type CI engine was operated by using Diesel fuel mixed with several volume portions of MTBE, including 5, 10 and 15%, several positive results were obtained, as compared with those from the baseline neat Diesel-fueled operations: (1) The engine delivers overall comparable or better performance characteristics; (2) The brake thermal efficiency is higher at the advanced and late injection times; (3) Some considerable reduction of both soot and NOx emissions is found; (4) The ignition delay increases but the combustion duration decreases.
In order to help explain the unexpected responses of CI combustion to the above fuel modifications, high-speed in-cylinder spectral infrared digital imaging was performed for the same fuel modification. Some plausible and consistent results are observed, which help explain die above findings.
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Kajitani, S., Usisaki, H., Clasen, E., Campbell, S. et al., "MTBE for Improved Diesel Combustion and Emissions?," SAE Technical Paper 941688, 1994, https://doi.org/10.4271/941688.Also In
Diesel Engines: Fuel Injection, Combustion, Emissions, and Exhaust Aftertreatment
Number: SP-1050; Published: 1994-09-01
Number: SP-1050; Published: 1994-09-01
References
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- McComiskey, T. Jiang, H. Qian, Y. Rhee. K.T. Kent, J.C. “High-Speed Spectral Infrared Imaging of Spark Ignition Engine Combustion,” SAE Paper- 930865 1993 1993 SAE Transactions
- Jiang, H. Qian, Y. Rhee, K.T. “High-Speed Dual-Spectra Infrared Imaging,” Optical Engineering 32 6 1281 1289 1993
- Jeong, Y.I. Qian, Y. Campbell, S. Rhee, K.T. SAE Paper 941732 1994