Prediction of micro-explosion delay of emulsified fuel droplets

It is established, that the destruction of carbon deposits when the engine is running on a water-fuel emulsion occurs due to the phenomenon of micro-impact of emulsified fuel droplets, the evaporation rate of which depends on their diameter, pressure and amplitude of the gaseous medium. As a result of the removal of carbon deposits in the engines, there is an increase in the average compression value for the engine cylinders by 8 % and the engine power by 11 %, as well as a decrease in the specific fuel consumption by 10 % and the smoke of the exhaust gases by 16 %. Keywords: engine, water-fuel emulsion, micro-impact, emulsified fuel, compression. [email protected]

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Numerical Investigation of Internal Behavior and Optimal Preparation Condition of Emulsified Fuel Droplets

KAGAKU KOGAKU RONBUNSHU ◽

10.1252/kakoronbunshu.37.167 ◽

2011 ◽

Vol 37 (2) ◽

pp. 167-174

Author(s):

Yoshiyuki Suzuki ◽

Haruyuki Kamata ◽

Takuji Harada ◽

Masakazu Shoji ◽

Yohsuke Matsushita ◽

...

Keyword(s):

Numerical Investigation ◽

Preparation Condition ◽

Fuel Droplets ◽

Emulsified Fuel

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Visualization of aggregation process of dispersed water droplets and the effect of aggregation on secondary atomization of emulsified fuel droplets

Proceedings of the Combustion Institute ◽

10.1016/j.proci.2010.05.115 ◽

2011 ◽

Vol 33 (2) ◽

pp. 2063-2070 ◽

Cited By ~ 59

Author(s):

Yoshiyuki Suzuki ◽

Takuji Harada ◽

Hirotatsu Watanabe ◽

Masakazu Shoji ◽

Yohsuke Matsushita ◽

...

Keyword(s):

Aggregation Process ◽

Water Droplets ◽

Secondary Atomization ◽

Fuel Droplets ◽

Emulsified Fuel

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Spray characteristics of a fuel–water internally rapid mixing injector for burner combustion

10.31224/osf.io/dgj97 ◽

2018 ◽

Author(s):

Y. Nada ◽

Y. Kidoguchi ◽

S. Yoshimura ◽

K. Onoda ◽

D. Asao ◽

...

Keyword(s):

High Speed ◽

Sampling Method ◽

High Load ◽

Soot Emission ◽

Rapid Mixing ◽

Fuel Droplets ◽

Emulsified Fuel ◽

Mixing Chamber ◽

Atomization Characteristics ◽

Load Conditions

The fuel-water internally rapid mixing type of injector has been developed to reduce NOx and soot emissions from combustion furnaces operating under high-load conditions. The injector allows spray injection of water emulsified fuel originating from base fuel and water without any surfactants. The aim of present study is to elucidate the mechanism of emulsification occurring in the injector and the atomization characteristics of the injector. We measured the sizes of fuel droplets discharged from the injector by means of a high-speed shadowgraph method combined with image processing. Soybean oil was used as the base fuel. The flow patterns of the fuel and water in a transparent mixing chamber of the injector were also visualized. In addition, we investigated the inner structure of the large droplets sampled by an immersion droplet sampling method. The base fuel, water and air are separately introduced into the injector. In the mixing chamber of the injector, fuel and water are blown by swirling air, and then impinge on the inner wall of the chamber. The base fuel is emulsified through the mixing of fuel with water resulting from the impingement. The emulsified fuel moves to injection holes along the inner wall, and is finally discharged through the injection holes with atomizing air. The probability profiles of droplet size exhibit that the existence probabilities of coarse droplets with diameters greater than approximately 35 mm are increased when the fuel is emulsified. Although the emulsification deteriorates the atomization capability of the injector, the secondary atomization including the micro-explosion occurring in combustion furnaces would form fine droplets, and thus reducing the soot emission from the furnaces. The microscope observations revealed that the emulsified fuel filling in a large droplet sampled corresponds to W/O type.

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