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Experimental research of flame kernel development and its relation to cycle-to-cycle variability of homogenous charge spark ignition engine

Hunicz J.

Archivum Combustionis

2009

Vol. 29 nr 1-2

28-37

The paper presents research of flame kernel development conducted on a spark ignited homogenous charge single cylinder engine. Measurements were done with the use of a spark plug equipped with eight optical fibres placed inside the spark plug body. Position of the flame kernel front was identified on base of crankshaft position at the moment of light signals detection. The optical signal level of flame front arrival was set by comparison of flame volume with mass burnt fraction. Flame kernel behaviour was investigated at variable air excess ratio and ignition advance under three different engine loads and rotational speed of 2000 RPM. Coefficients of variation in flame kernel growth rate and indicated mean effective pressure (IMEP) were compared for all measurement conditions. Analysis of cross-correlation functions of flame kernel growth rate and IMEP for consecutive cycles have shown that correlation coefficient sign depends on ignition timing in relation to minimum ignition advance set for best torque.