An experimental study on the spray characteristics of diesel-dimethyl ether (DME) blended fuels by phase doppler anemometry |
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Authors: | Email author" target="_blank">Jin?XiaoEmail author Zhen?Huang XinQi?Qiao |
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Affiliation: | (1) Key Laboratory of Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China |
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Abstract: | This paper presents an experimental study on the spray characteristics of diesel-dimethyl ether (DME) blended fuels by phase
doppler anemometry (PDA). Blended fuels with DME mass fractions of 15%, 30% and pure diesel fuel were used to evaluate the
effect of the DME concentration on the spray pattern, droplet size and velocity. The data for spray velocity vector and droplet
size field were obtained. The experimental results reveal that the micro-explosive function exists in the jet of diesel-dimethyl
ether (DME) blended fuels and the radial velocity of the blended fuels spray is larger than that of conventional diesel fuel
spray near the nozzle exit. At the downstream part of the spray, the radial velocity and its attenuation rate of blended fuels
are much more uniform and smaller than those of pure diesel spray. At the centerline of the spray, the attenuation rates of
all spray axial velocities are similar. With the increase of DME concentration in the fuel, the spray angle and the exit velocity
increase and the droplet size deceases.
Supported by the National Natural Science Foundation of China (Grant No. 50806046) and the National Basic Research Program
of China (“973” Project) (Grant No. 2007CB210007) |
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Keywords: | blended fuel phase doppler anemometry spray |
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