Empirical Investigation of Spark-Ignited Flame-Initiation Cycle-to-Cycle Variability in a Homogeneous-Charge Reciprocating Engine Corresponding Author

Abstract : This experimental study investigates the flame initiation-period variability in the spark-ignited homogeneous-charge TCC-III engine. The engine was operated with lean, rich, and stoichiometric, propane and methane, with and without nitrogen dilution. These operating conditions were chosen to systematically change the unstretched laminar flame velocity and the Markstein number. Traditional pressure measures, apparent heat release analysis, particle image velocimetry (PIV), and OH* flame imaging were used to generate over 400 metrics for 750 cycles at each of the 34 tests at 11 operating conditions. A multivariate statistical analysis was used to identify the parameters important to the variability of the crank angle at 10% fuel mass-fraction burned (CA10), but not could reveal physical mechanisms or cause and effect. The analysis here revealed that the combustion-phasing cycle-to-cycle variations (CCV) is established by the time of the notional laminar-to-turbulent flame transition that occurs by CA01, measured here from the flame-image growth. Both the Markstein number and stretched laminar flame speed were found to be important. The velocity magnitude and direction were found to correlate with fast and slow CA10 as found in early literature. It was also revealed that the shear-strength, a property of the strain-rate tensor at the scales resolved here (1 mm), deserves further investigation as a possible effect on CA10.
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Submitted on : Monday, December 17, 2018 - 5:13:54 PM
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Philipp Schiffmann, Volker Sick, David Reuss. Empirical Investigation of Spark-Ignited Flame-Initiation Cycle-to-Cycle Variability in a Homogeneous-Charge Reciprocating Engine Corresponding Author. International Journal of Engine Research, SAGE Publications (UK and US), 2018, 19 (5), pp.491-508. ⟨10.1177/1468087417720558⟩. ⟨hal-01958143⟩

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