Journal
ENERGY
Volume 186, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2019.07.098
Keywords
Ultra-high injection pressure; Ethanol-diesel fuel blends; Spray tip penetration and velocity; Shock waves
Categories
Funding
- National Natural Science and Foundation of China [51676012]
- Fundamental Research Funds for the Central Universities [M19113100130]
- Nation Civil Astronautic Project Research on the optimization of mixed-mode propulsion system
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In the present study, the atomization characteristics of ethanol-diesel blends fuel spray and shock waves were investigated by using experimental methods under ultra-high injection pressure in the range 200Mpa-350 MPa. A high-speed camera and Schlieren technology were used to visualize the fuel spray morphology and shock waves. The spray tip penetration, velocity and shock wave angle were determined via experimental approaches. Furthermore, the special spray shape under ultra-high injection pressure, such as liquid tail, expanded body and bifurcated structures, was analyzed. To validate the classical spray empirical models, predicted spray penetration results based on two typical models (Dent's and Hiroyasu's model) were compared with experimental data. The results indicated that fuel injection pressure and ethanol volume fraction presented significant effects on the spray evolution. With increasing injection pressure, the spray tip penetration became faster and the induced attached shock waves reveal clearer. The fuel spray jets achieved the larger penetration velocity and more induced shock waves under higher injection pressure or lower ethanol volume fraction. (C) 2019 Elsevier Ltd. All rights reserved.
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