Authors
Todd D Fansler, David L Reuss, Volker Sick, Rainer N Dahms
Publication date
2015/4
Source
International Journal of Engine Research
Volume
16
Issue
3
Pages
260-305
Publisher
SAGE Publications
Description
This article reviews systematic research on combustion instabilities (principally rare, random misfires and partial burns) in spray-guided stratified-charge (SGSC) engines operated at part load with highly stratified fuel -air -residual mixtures. Results from high-speed optical imaging diagnostics and numerical simulation provide a conceptual framework and quantify the sensitivity of ignition and flame propagation to strong, cyclically varying temporal and spatial gradients in the flow field and in the fuel -air -residual distribution. For SGSC engines using multi-hole injectors, spark stretching and locally rich ignition are beneficial. Combustion instability is dominated by convective flow fluctuations that impede motion of the spark or flame kernel toward the bulk of the fuel, coupled with low flame speeds due to locally lean mixtures surrounding the kernel. In SGSC engines using outwardly opening piezo-electric injectors …
Scholar articles
TD Fansler, DL Reuss, V Sick, RN Dahms - International Journal of Engine Research, 2015