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International Journal of Automotive Technology > Volume 19(3); 2018 > Article
International Journal of Automotive Technology 2018;19(3): 535-545.
doi: https://doi.org/10.1007/s12239-018-0051-y
Prathan Srichai1, Pop-Paul Ewphun1, Chinda Charoenphonphanich1, Preechar Karin1, Manida Tongroon5, Nuwong Chollacoop5
1King Mongkut’s Institute of Technology Ladkrabang
5National Science and Technology Development Agency
This research attempts to characterize the injection of palm biodiesel blended with diesel in a Zuech’s chamber. Thailand conventional diesel (mandated blend of biodiesel at 5 % or B5), palm biodiesel (B100) and four other biodiesel blends ratios (B20, B40, B60 and B80) were investigated with single hole injector of 140 and 200 μm diameters, injection pressure of 40 MPa to 160 MPa, constant back pressure of 4.5 MPa and energize time of 2.5 ms. The results show that increasing biodiesel blending ratios leads to longer injection delay, larger injection pressure drop, smaller injection quantity discharge coefficient (Cd) and shorter injection duration. With increasing biodiesel blending ratio, high Cavitation number from biodiesel viscosity decreases Reynolds number. Increasing injector diameter from 140 μm to 200 μm has reduced injection delay, increased fuel injection quantity, discharge coefficient and remaining injection duration. The increasing of injection pressure were improve, injection delay, injection duration, injection quantity and discharge coefficient until injection pressure 120 MPa. In addition at injection pressure over 120 MPa are decrease injection quantity and discharge coefficient, it effect form the cavitation phenomena. Increasing of viscosity, density, Bulk modulus and sound velocity were effect to increase injection delay, with reduce injection quantity, injection duration and pressure drop during injection process.
Key Words: Palm methyl ester, Injection characteristics, Injector diameter, Injector pressure, Zuench’s chamber
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