Double-Pulse PLIF Imaging of Self-Ignition Centers in an SI Engine

作者: Robert Schießl , Andreas Dreizler , Ulrich Maas , Andrew J Grant , Paul Ewart

DOI: 10.4271/2001-01-1925

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摘要: In this study, the occurrence of auto-ignition centers in a two-stroke SI engine was investigated using planar laserinduced fluorescence (PLIF). An experimental equipped with glass windows to enable full optical access into combustion chamber operated under knocking conditions. The pulsed output two XeCl excimer lasers formed light sheets (300 μm × 4 cm), which were spatially overlapped and directed operating engine. Unburned fuel components fluoresce strongly when illuminated laser radiation; burned regions display no fluorescence. Self-ignited therefore show up as dark sites images, indicating local consumption fuel. resulting PLIF images recorded fast-gated ICCD cameras. By delaying second pulse specific time (100 ns—600 μs), image pairs acquired allowed temporal development mutual influence hot-spots be studied. short duration (20 ns), two-dimensional nature imaged region strong signals obtained from our detection scheme yield very detailed information self-ignited regions. Approximately 20 000 recorded. As important quantities, spatial distribution expansion velocities extracted statistically.

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