Effects of gas composition on the performance and emissions of compressed natural gas engines

Byung Hyouk Min, Jin Taek Chung, Ho Young Kim, Simsoo Park

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Natural gas is considered to be a promising alternative fuel for passenger cars, truck transportation and stationary engines providing positive effects both on the environment and energy security. However, since the composition of natural gas fuel varies with location, climate and other factors, it is anticipated that such changes in fuel properties will affect emission characteristics and performance of CNG (Compressed Natural Gas) engines. The purpose of the present study is to investigate the effects of the difference in gas composition on the engine performance and emission characteristics. The results show that THC (Total Hydrocarbon) decreases with increasing WI (Wobbe Index) and MCP (Maximum Combustion Potential). On the other hand, it is observed that NOx slightly increases as WI and MCP increase. The TLHV (Total Lower Heating Value of Intake) is proposed in this study as a potential index for compatibility of gas fuels in a CNG engine. There is a variation in power up to 20% depending on the composition of gas when the A/F ratio and spark timing are fixed for a specific gas fuel.

Original languageEnglish
Pages (from-to)219-226
Number of pages8
JournalKSME International Journal
Issue number2
Publication statusPublished - 2002 Feb


  • CNG (Compressed Natural Gas)
  • Emission
  • Gas Composition
  • MCP (Maximum Combustion Potential)
  • Total Lower Heating Value of Intake (TLHV)
  • WI (Wobbe Index)

ASJC Scopus subject areas

  • Mechanical Engineering


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