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Effects of High EGR Rate on Dimethyl Ether (DME) Combustion and Pollutant Emission Characteristics in a Direct Injection Diesel Engine

Author

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  • Seung Hyun Yoon

    (Division of Automotive Engineering, Yeungnam College of Science & Technology, 170 Hyeonchung-ro, Nam-gu, Daegu 705-703, Korea)

  • Seung Chul Han

    (Division of Automotive Engineering, Yeungnam College of Science & Technology, 170 Hyeonchung-ro, Nam-gu, Daegu 705-703, Korea)

  • Chang Sik Lee

    (School of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea)

Abstract

This study investigated the effects of high exhaust gas recirculation (EGR) rates on dimethyl ether (DME) fuel combustion performance, exhaust emissions and particle emission characteristics in a small direct injection diesel engine under various injection timings. To examine the effect of EGR and injection timings, the experiment was performed under high EGR rates (0%, 30%, 50%) and injection timings were varied from 40° before top dead center (BTDC) to top dead center (TDC) of the crank angle to examine the effects of early injection of DME fuel. The combustion pressures and heat release rates for different EGR rates followed similar trends. As the injection timing was advanced, the indicated mean effective pressure (IMEP) differed little in response to EGR rate in the range from TDC to 25° BTDC, and more for crank angles beyond 25° BTDC. DME combustion exhibited very little soot emission, but soot emission increased slightly with EGR rate. The use of high EGR during combustion produced very low NO x concentrations but increased HC and CO emissions for advanced injection timings from 25° BTDC to 40° BTDC. The use of EGR increased both the emissions of total particle number and particle volume over the whole range of the injection timings; for all cases, total particle volume decreased as injection timing was advanced.

Suggested Citation

  • Seung Hyun Yoon & Seung Chul Han & Chang Sik Lee, 2013. "Effects of High EGR Rate on Dimethyl Ether (DME) Combustion and Pollutant Emission Characteristics in a Direct Injection Diesel Engine," Energies, MDPI, vol. 6(10), pages 1-11, October.
    • Handle: RePEc:gam:jeners:v:6:y:2013:i:10:p:5157-5167:d:29451
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    References listed on IDEAS

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    1. Wang, Xiangang & Huang, Zuohua & Zhang, Wu & Kuti, Olawole Abiola & Nishida, Keiya, 2011. "Effects of ultra-high injection pressure and micro-hole nozzle on flame structure and soot formation of impinging diesel spray," Applied Energy, Elsevier, vol. 88(5), pages 1620-1628, May.
    2. Torres García, Miguel & José Jiménez-Espadafor Aguilar, Francisco & Sánchez Lencero, Tomás, 2009. "Experimental study of the performances of a modified diesel engine operating in homogeneous charge compression ignition (HCCI) combustion mode versus the original diesel combustion mode," Energy, Elsevier, vol. 34(2), pages 159-171.
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    1. Anca N. Iuga (Butnariu) & Vasile N. Popa & Luminița I. Popa, 2018. "Comparative Analysis of Automotive Products Regarding the Influence of Eco-Friendly Methods to Emissions’ Reduction," Energies, MDPI, vol. 12(1), pages 1-24, December.
    2. Hanzhengnan Yu & Xingyu Liang & Gequn Shu & Xu Wang & Yuesen Wang & Hongsheng Zhang, 2016. "Experimental Investigation on Wall Film Distribution of Dimethyl Ether/Diesel Blended Fuels Formed during Spray Wall Impingement," Energies, MDPI, vol. 9(11), pages 1-17, November.
    3. Seemoon Yang & Changhee Lee, 2018. "Experimental Research on the Injection Rate of DME and Diesel Fuel in Common Rail Injection System by Using Bosch and Zeuch Methods," Energies, MDPI, vol. 11(2), pages 1-11, January.
    4. Wei Wang & Dong Liu & Yaoyao Ying & Guannan Liu & Ye Wu, 2017. "On the Response of Nascent Soot Nanostructure and Oxidative Reactivity to Photoflash Exposure," Energies, MDPI, vol. 10(7), pages 1-11, July.
    5. Giorgio Zamboni & Simone Moggia & Massimo Capobianco, 2017. "Effects of a Dual-Loop Exhaust Gas Recirculation System and Variable Nozzle Turbine Control on the Operating Parameters of an Automotive Diesel Engine," Energies, MDPI, vol. 10(1), pages 1-18, January.

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