Investigations of the Effect of Humid Air on NOX & PM Emissions of a CNG Engine

Numerical and experimental investigations of the effect of a humid air system on nitrogen oxides (NOx) and Particulate Matter (PM) emissions of a compressed natural gas (CNG) engine have been performed. For the numerical modeling, non-premixed combustion in a single cylinder was simulated using the presumed probability density function combustion model. Simulations were performed for dry as well as humid air intake, ranging from 5% to 30% relative humidity (RH). Numerical results have shown 40% reduction in NO emission at 10% relative humidity, when compared with the corresponding emission with dry intake air. With 15% and 30% relative humidity levels, NO emission were reduced by 65% and 93% respectively.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Figures; References; Tables;
  • Pagination: 22p

Subject/Index Terms

Filing Info

  • Accession Number: 01700462
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Report/Paper Numbers: CA16-2932, METRANS-CSULB contract number G18571, METRANS-CSULB G185715100
  • Contract Numbers: 65A0533 TO 013
  • Created Date: Dec 19 2018 1:32PM