Three-dimensional laser induced fluorescence of fuel distributions in an HCCI engine
| Autor: | Jenny Nygren, Marcus Aldén, Johan Hult, Bengt Johansson, Mattias Richter, Magnus Christensen, Anders Hultqvist |
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| Rok vydání: | 2002 |
| Předmět: |
Chemistry
business.industry Mechanical Engineering General Chemical Engineering Homogeneous charge compression ignition Laser Combustion law.invention Ignition system Optics law Fuel efficiency Equidistant Physical and Theoretical Chemistry business Laser-induced fluorescence Intensity (heat transfer) |
| Zdroj: | Proceedings of the Combustion Institute. 29:679-685 |
| ISSN: | 1540-7489 |
| DOI: | 10.1016/s1540-7489(02)80087-6 |
| Popis: | Three-dimensional imaging of fuel tracer planar laser-induced fluorescence in a homogeneous charge compression ignition (HCCI) engine is presented. A high-speed multiple Nd:YAG laser and detection system, in combination, with a scanning mirror, are used to collect eight images, with an equidistant separation of 0.5 mm. Three-dimensional isoconcentration surfaces calculated from the data are visualized. Three-dimensional imaging offers new opportunities to study different combustion events, specifically the topology of flame structures. For example, it is possible to distinguish if separate islands in a fluorescence image really are separate or if it is an effect from wrinkling in and out of the laser sheet. The PLIF images were also analyzed by identifying five intensity ranges corresponding to increasing degrees of reaction progress. The gradual fuel consumption and thus combustion was then analyzed by calculating the volumetric fraction of these intensity ranges for different crank angle positions. The occurrence of multiple isolated ignition spots and the observed gradual decrease in fuel concentration indicates that HCCI combustion relies on distributed reactions and not flame propagation. (Less) |
| Databáze: | OpenAIRE |
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