Experimental investigation on the performance, gaseous and particulate emissions of a methanol fumigated diesel engine

C. H. Cheng, Chun Shun Cheung, Tat Leung Chan, Shuncheng Lee, C. D. Yao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

124 Citations (Scopus)


Experiments were conducted on a 4-cylinder direct-injection diesel engine with fumigation methanol injected into the air intake of each cylinder. The fumigation methanol was injected to top up 10%, 20% and 30% of the power output under different engine operating conditions. The effects of fumigation methanol on engine performance, gaseous emissions and particulate emission were investigated. The experimental results show that there is a decrease in the brake thermal efficiency when fumigation methanol is applied, except at the highest load of 0.67 MPa. At low loads, the brake thermal efficiency decreases with increase in fumigation methanol; but at high loads, it increases with increase in fumigation methanol. The fumigation method results in a significant increase in hydrocarbon (HC), carbon monoxide (CO), and nitrogen dioxide (NO2) emissions. The concentration of nitrogen oxides (NOx) is significantly reduced except at close to full load condition. There is also a reduction in the smoke opacity and the particulate matter (PM) mass concentration. For the submicron particles, the total number of particles decreases at low and medium loads but increases at high loads. In all cases, there is a shift of the particles towards smaller geometrical mean diameter, especially at high loads. The increase in nano-sized particles and the increase in NO2emission could have serious impact on human health.
Original languageEnglish
Pages (from-to)115-124
Number of pages10
JournalScience of the Total Environment
Issue number1
Publication statusPublished - 15 Jan 2008


  • Diesel engine
  • Gaseous emissions
  • Methanol
  • Particle size distribution
  • Particulate mass
  • Ultra-low sulfur diesel

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution


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