Effect of n-pentanol addition on the combustion, performance andemission characteristics of a direct-injection diesel engine

Liangjie Wei, Chun Shun Cheung, Zuohua Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

183 Citations (Scopus)


In this study, experiments were conducted to examine the effect of using a mixture of diesel and n-pentanol, which is one of the second-generation biofuels with comparable properties to diesel fuel, as fuel on the combustion, performance, and gaseous and particulate emissions of a naturally-aspirated, four-cylinder, direct-injection diesel engine. Three n-pentanol fractions in the fuel mixture were selected: 10, 20 and 30% by volume. Results show that, the addition of n-pentanol leads to longer ignition delay and increases the peak heat release rate in the premixed combustion phase. The brake specific fuel consumption increases with increase of n-pentanol, while the brake thermal efficiency is not affected. Regarding the gaseous emissions, n-pentanol addition results in the following consequence: (a) HC (hydrocarbon) and CO (carbon monoxide) emissions increase for 30% n-pentanol in the blended fuel at low engine load but decrease at high engine load; (b) a slight increase (maximum 8%) in NOxemissions but noticeable increase in NO2emissions. Regarding the particulate emissions, n-pentanol is found to be very promising in terms of reducing both the mass concentration and the particulate number concentration simultaneously.
Original languageEnglish
Pages (from-to)172-180
Number of pages9
Publication statusPublished - 1 Jun 2014


  • Combustion
  • Diesel engine
  • Gaseous emissions
  • Particle emissions
  • Pentanol
  • Second-generation biofuel

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Energy(all)
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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