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Influence of Biodiesel Blended in Gasoline-Based Fuels on Macroscopic Spray Structure from a Diesel Injector

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Abstract

This research investigates the spray characteristics of gasoline-biodiesel blended fuels (GB), which expected to be utilized in a gasoline compression ignition engine. Commercial gasoline blended with 0 ∼ 20 % by volume of biodiesel, called GB00 – GB20, were used to experiment. In addition, neat biodiesel and pure gasoline were also investigated as the references. Firstly, the chemical and physical properties of the GB blends were characterized to clarify the effect of biodiesel content. Then, spray macroscopic visualization was performed by the shadowgraph technique. The test fuels at injection pressures of 1,000, 1,200, and 1,350 bar were injected into a constant volume combustion chamber (CVCC). The constant back pressures in the CVCC were set at 30 bar and 50 bar. The spray penetrating length and cone angle were analyzed by an image processing technique. Biodiesel is characterized as the widest angle and longest spray length while gasoline has the narrowest cone angle and shortest penetration. There is no correlation between the spray angle/penetration length and the percentage of biodiesel in the blends among the GB. When the injection pressure was increased, the spray cone angle was slightly decreased, while the spray-penetrating length was increased for all test fuels.

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Abbreviations

B100:

neat biodiesel

BP:

back pressure

CVCC:

constant volume combustion chamber

Cv :

velocity coefficient

GB00:

pure gasoline

GB05:

5 % biodiesel-blended gasoline

GB10:

10 % biodiesel-blended gasoline

GB15:

15 % biodiesel-blended gasoline

GB20:

20 % biodiesel-blended gasoline

IP:

injection pressure

S:

spray penetration length

t:

time

tr :

transition time between initial and developed spray

γ m :

surface tension of mixture

γ i :

surface tension of component

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Acknowledgement

This research was supported by The Leading Human Resource Training Program of the Regional Neo Industry through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2016H1D5A1908826).

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Authors and Affiliations

  1. Graduate School of Mechanical Engineering, University of Ulsan, Ulsan, 44610, Korea

    Sakda Thongchai

  2. School of Mechanical Engineering, University of Ulsan, Ulsan, 44610, Korea

    Ocktaeck Lim

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  1. Sakda Thongchai
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Correspondence to Ocktaeck Lim.

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Thongchai, S., Lim, O. Influence of Biodiesel Blended in Gasoline-Based Fuels on Macroscopic Spray Structure from a Diesel Injector. Int.J Automot. Technol. 20, 701–711 (2019). https://doi.org/10.1007/s12239-019-0066-z

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