Spatio-temporal identification of plume dynamics by 3D computed tomography using engine combustion network spray G injector and various fuels
Autor: | Lyle M. Pickett, Joonsik Hwang, Phoevos Koukouvinis, I.K. Karathanassis, Lukas Weiss, Scott A. Skeen |
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Rok vydání: | 2020 |
Předmět: |
Tomographic reconstruction
TL 020209 energy General Chemical Engineering Organic Chemistry Nozzle Energy Engineering and Power Technology 02 engineering and technology Mechanics Injector Combustion Schlieren imaging Plume law.invention Fuel Technology 020401 chemical engineering TA 13. Climate action law Extinction (optical mineralogy) 0202 electrical engineering electronic engineering information engineering Environmental science TJ 0204 chemical engineering Combustion chamber |
Zdroj: | Fuel |
ISSN: | 0016-2361 |
DOI: | 10.1016/j.fuel.2020.118359 |
Popis: | Understanding of plume direction and mixture quality in a combustion chamber is crucial to improve engine performance. While a variety of diagnostics using laser and x-ray facilities have been applied to identify plume direction, most applications require sophisticated experimental setup as well as troubleshooting for light attenuation or scattering issues. In this study, we acquire temporally and spatially resolved liquid volume fraction by three-dimensional tomographic reconstruction of ensemble-averaged extinction images to produce unique information on plume movement and growth in the midst of a multi-plume spray. Measurements were carried out in a constant-flow spray vessel coupled with high-speed Mie-scattering, diffused back-illumination extinction, and schlieren imaging. Four different fuels, a single component iso-octane, a multi-component surrogate with di-isobutylene, a multi-component fuel with olefinic molecular structure, and a 70% standardized gasoline 30% ethanol (e30) blend were injected using Engine Combustion Network (ECN) Spray G injector under ECN G2 (50 kPa absolute), G3 (100 kPa absolute), and G3HT (G3 with 393 K ambient temperature) conditions. Planar slices, available from the tomographically reconstructed extinction data, confirmed greater plume-to-plume interaction for the flash-boiling G2 iso-octane condition with an approximately 6° smaller plume direction angle relative to the injector axis, compared to the nozzle drill angle. The olefinic and e30 fuels, which have broader distillation curves, exhibited stronger plume growth and eventual complete spray plume collapse and longer time for evaporation. Using the 3D dataset, we show that factors that increase plume growth also create more interaction between plumes to ultimately reduce the plume direction angle. |
Databáze: | OpenAIRE |
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