Open AccessCycle-by-cycle variations in a spark ignition engine fueled with gasoline and natural gas
Author(s) -
Pawan Kumar Singotia,
Samir Saraswati
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/691/1/012061
Subject(s) - mean effective pressure , spark ignition engine , gasoline , natural gas , petrol engine , automotive engineering , octane rating , internal combustion engine , homogeneous charge compression ignition , environmental science , combustion , engine knocking , ignition timing , compression ratio , chemistry , combustion chamber , engineering , waste management , organic chemistry
A comparative study of cycle-by-cycle variations (CCV) in a spark ignition (SI) engine fueled with gasoline and natural gas was conducted. The average peak cylinder pressure (PP), indicated mean effective pressure (IMEP) and maximum rate of pressure rise ((dp/dθ) max )are found to be low for engine fueled with natural gas in comparison to that of gasoline. However, the CCV of these parameters increases as engine operation is switched from gasoline to natural gas. The coefficient of variation (COV) of PP, IMEP and (dp/dθ) max significantly increases at very low load condition for both the fuels due to high residual gases. Natural gas engine shows more misfiring cycles in comparison to gasoline engine. Further, CCV increases with the increase of engine speed for both the fuels because of an increase in turbulence and instable combustion at high engine speed. As engine speed increases and engine load decreases the combustion based parameters become more independent of crank angle due to high CCV in these conditions.