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Governing parameters and dynamics of turbulent spray atomization from modern GDI injectors

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  • Moon, Seoksu
  • Li, Tianyun
  • Sato, Kiyotaka
  • Yokohata, Hideaki

Abstract

Understanding the governing parameters and dynamics of turbulent spray atomization is essential for the advancement of fuel injection technologies, but no concrete understandings have been derived previously. The current study investigates the governing parameters and dynamics of turbulent spray atomization by experimental observations of near-nozzle spray phenomena using an X-ray imaging technique. The effects of critical injection parameters such as fuel property, injection pressure and ambient density on near-nozzle liquid feature size and velocity distributions were extensively studied using three injection nozzles having different levels of initial flow turbulence and dispersion. Based on the results, the governing parameters and dynamics of turbulent spray atomization and the issues on the advanced fuel injection control of modern engines were thoroughly discussed. The results showed that fuel and injection pressure effects on spray atomization became insignificant from a critical Weber number which decreased upon the increase in initial flow turbulence and dispersion. The increase in ambient density increased the resultant droplet size at downstream due to the faster deceleration of spray which brought the atomization termination location closer to the nozzle exit. The spray atomization was terminated at the location of ca. 72% exit velocity regardless of the injection condition.

Suggested Citation

  • Moon, Seoksu & Li, Tianyun & Sato, Kiyotaka & Yokohata, Hideaki, 2017. "Governing parameters and dynamics of turbulent spray atomization from modern GDI injectors," Energy, Elsevier, vol. 127(C), pages 89-100.
    • Handle: RePEc:eee:energy:v:127:y:2017:i:c:p:89-100
    DOI: 10.1016/j.energy.2017.03.099
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    1. Moon, Seoksu & Huang, Weidi & Li, Zhilong & Wang, Jin, 2016. "End-of-injection fuel dribble of multi-hole diesel injector: Comprehensive investigation of phenomenon and discussion on control strategy," Applied Energy, Elsevier, vol. 179(C), pages 7-16.
    2. Battistoni, Michele & Grimaldi, Carlo Nazareno, 2012. "Numerical analysis of injector flow and spray characteristics from diesel injectors using fossil and biodiesel fuels," Applied Energy, Elsevier, vol. 97(C), pages 656-666.
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