Influence of In-Cylinder Air Flow on Spray Propagation

The influence of in-cylinder flow on the propagation of 2-Butanone and Ethanol sprays is studied. To solely evaluate the interaction of air flow and fuel, high-speed Mie-Scattering Imaging of hollow cone sprays is conducted both in a single-cylinder optical engine with tumble movement and in a press...

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Bibliographic Details
Published in:SAE International Journal of Engines 2017-10, Vol.10 (4), p.1398-1410, Article 2017-01-9280
Main Authors: Braun, Marco, Palmer, Johannes, Overbrueggen, Timo van, Klaas, Michael, Kneer, Reinhold, Schroeder, Wolfgang
Format: Article
Language:English
Subjects:
Air flow
Comparative analysis
Droplets
Engine cylinders
Ethanol
Ethanol fuels
Evaporation
Gasoline
Liquid fuels
Pressure vessels
Propagation
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Summary:The influence of in-cylinder flow on the propagation of 2-Butanone and Ethanol sprays is studied. To solely evaluate the interaction of air flow and fuel, high-speed Mie-Scattering Imaging of hollow cone sprays is conducted both in a single-cylinder optical engine with tumble movement and in a pressure vessel with negligible air flow. The direct comparison reveals an improved spray propagation of 2-Butanone due to the engine’s air flow. The lower viscosity of 2-Butanone causes an enhanced jet breakup compared to Ethanol such that the spray consists of more and smaller droplets. Small droplets possess a lower momentum, which allows the droplets to be more efficiently transported by the air flow. Consequently, the fuel distribution across the cylinder is enhanced. As the liquid fuel is distributed to a larger volume, improved convection accelerates evaporation. Finally, 2-Butanone is more volatile compared to Ethanol, which further improves evaporation, such that, 2-Butanone is considered a promising surrogate fuel for Ethanol and Gasoline.
ISSN:1946-3936
1946-3944
1946-3944
DOI:10.4271/2017-01-9280