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Modified Single-Fluid Cavitation Model for Pure Diesel and Biodiesel Fuels in Direct Injection Fuel Injectors

[+] Author Affiliations
Kaushik Saha, Ehab Abu-Ramadan, Xianguo Li

University of Waterloo, Waterloo, ON Canada

Paper No. ICEF2012-92085, pp. 141-152; 12 pages
doi:10.1115/ICEF2012-92085
From:
  • ASME 2012 Internal Combustion Engine Division Fall Technical Conference
  • ASME 2012 Internal Combustion Engine Division Fall Technical Conference
  • Vancouver, BC, Canada, September 23–26, 2012
  • Conference Sponsors: Internal Combustion Engine Division
  • ISBN: 978-0-7918-5509-6
  • Copyright © 2012 by ASME

abstract

A cavitation model has been developed for the internal two-phase flow of diesel and biodiesel fuels in fuel injectors under high injection pressure conditions. The model is based on the conventional single-fluid mixture approach with modification in the phase change rate expressions and local mean effective pressure, considering the effects of viscous stresses and turbulent pressure fluctuations, and also takes into account the effects of turbulence, compressibility and wall roughness. The model is validated by comparing the model predictions of probable cavitation regions, velocity distribution, fuel mass flow rate and pressure with the experimental measurement available in literature. It is found that cavitation inception for biodiesel occurs at a higher injection pressure, compared to diesel, due to its lower saturation pressure. However, supercavitation occurs for both diesel and biodiesel at high injection pressures. RNG k–ε model for turbulence modeling is reliable by comparing its performance with realizable k–ε and SST k–ω models. The effect of liquid phase compressibility becomes considerable for very high injection pressures. Wall roughness is not an important factor for cavitation in fuel injectors.

Copyright © 2012 by ASME

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