Effects of natural gas composition and compression ratio on the thermodynamic and combustion characteristics of a heavy-duty lean-burn SI engine fueled with liquefied natural gas

In this study, the effects of natural gas composition and compression ratio on thermodynamic and combustion characteristics were comprehensively investigated using a spark ignition liquefied natural gas engine modified from a heavy-duty compression ignition engine. LNG fuel samples with two different methane compositions and a series of compression ratios were tested and analyzed with the same boundary conditions at a lean burn condition of 1.38...