Effects of H2 on the number concentration of particulate matter in diesel engines using a low-pressure loop exhaust-gas recirculation system

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We investigated the effects of H2 on the number concentration of particulate matter (PM) emissions from a diesel engine fitted with a low-pressure loop exhaust gas recirculation system. We used a 2.2-L four-cylinder direct-injection diesel engine satisfying EURO V regulations, and converted this engine to include an H2 feed. The air/fuel (A/F) ratio was varied in the range of 21.9-45.5 and the brake mean effective pressure was varied in the range of 2-6 bars to control the O2 concentration and in-cylinder temperature, both of which are significant for PM emissions. The number concentration of the emitted PM was measured using a scanning mobility particle sizer. We found that the emitted PM decreased by the addition of H 2 which caused the unburned gas temperature increased. Furthermore, the degree of reduction was larger as the A/F ratio, load, and H2 energy fraction increased. However, with A/F ratios of less than 21.9, the addition of H2 increased the number concentration of emitted PM which was attributed to the small O2 concentration at these A/F ratios.

Original languageEnglish
Pages (from-to)6746-6752
Number of pages7
JournalInternational Journal of Hydrogen Energy
Issue number12
Publication statusPublished - 2014 Apr 15


All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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