Injection Characteristics of Palm Methyl Ester Blended with Diesel Using Zuech’s Chamber

  • Prathan Srichai
  • Pop-Paul Ewphun
  • Chinda Charoenphonphanich
  • Preechar Karin
  • Manida Tongroon
  • Nuwong Chollacoop


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 



injection rate, mg/ms


fuel density, kg/m3


internal volume of zuech’s chamber, cm3


rate of pressure change in chamber, MPa/ ms


isothermal bulk modulus, MPa


back pressure in Zuech’s chamber, MPa


volume change during bulk modulus test, cm3


number of orifices, hole


cross-section area of orifice exit, mm2


difference of injection and back pressure, MPa


discharge coefficient


average of flow velocity, m/s


coefficient of velocity


diameter of orifice exit, μm


fuel viscosity, cSt


cavitation number


injection pressure, MPa


vapor pressure, MPa


back pressure, MPa


start of injection


start of energize


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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Prathan Srichai
    • 1
  • Pop-Paul Ewphun
    • 2
  • Chinda Charoenphonphanich
    • 1
  • Preechar Karin
    • 2
  • Manida Tongroon
    • 3
  • Nuwong Chollacoop
    • 3
  1. 1.Faculty of EngineeringKing Mongkut’s Institute of Technology LadkrabangBangkokThailand
  2. 2.International CollegeKing Mongkut’s Institute of Technology LadkrabangBangkokThailand
  3. 3.National Metal and Materials Technology Center (MTEC)National Science and Technology Development Agency (NSTDA)PathumthaniThailand

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