Biodiesel is an attracted alternative fuel and biodiesel–diesel blends can be used as fuel in order to substitute some part of diesel in engine at various applications. In this study, the spray properties of different type of blends of biodiesel–diesel (25%, 50%, 75% and 100% biodiesel) as well as pure diesel is investigated under various ambient conditions by means of high-speed schlieren photography technique. A comparative analysis of blended fuels and diesel sprays is also presented. The experimental results show that when adopting fuel blends with variable biodiesel–diesel fractions in the swirl-type injector sprays, the spray developing patterns are not significantly changed. In the case of low ambient pressure (surrounding condition), the main spray tip penetration decreases and the spray angle increases with the increase of biodiesel fraction. Under the elevated ambient pressure condition, the difference of spray penetration amongst the blends shows inconspicuous, meanwhile the spray angle of all test fuels keeps almost constant in the fully developed stage except that the spray of pure diesel shows a larger cone angle in the beginning of injection period.
Biodiesel, spray, Blends
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