Modeling of internal and near-nozzle flow for a GDI fuel injector

Conference · Sun Nov 08 04:00:00 EST 2015

DOI:https://doi.org/10.1115/ICEF2015-1112· OSTI ID:1336934

Saha, Kaushik ^[1]; Som, Sibendu ^[1]; Battistoni, Michele ^[2]; Li, Yanheng ^[3]; Quan, Shaoping ^[3]; Senecal, Peter Kelly ^[3]

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1. Argonne National Lab. (ANL), Argonne, IL (United States)
2. Univ. of Perugia (Italy)
3. Convergent Science Inc., Madison, WI (United States)

A numerical study of two-phase flow inside the nozzle holes and the issuing spray jets for a multi-hole direct injection gasoline injector has been presented in this work. The injector geometry is representative of the Spray G nozzle, an eight-hole counterbore injector, from the Engine Combustion Network (ECN). Simulations have been carried out for a fixed needle lift. Effects of turbulence, compressibility and non-condensable gases have been considered in this work. Standard k -ε turbulence model has been used to model the turbulence. Homogeneous Relaxation Model (HRM) coupled with Volume of Fluid (VOF) approach has been utilized to capture the phase change phenomena inside and outside the injector nozzle. Three different boundary conditions for the outlet domain have been imposed to examine non-flashing and evaporative, non-flashing and non-evaporative and flashing conditions. Noticeable hole-to-hole variations have been observed in terms of mass flow rates for all the holes under all the operating conditions considered in this study. Inside the nozzle holes mild cavitation-like and in the near-nozzle region flash boiling phenomena have been predicted when liquid fuel is subjected to superheated ambiance. Under favorable conditions considerable flashing has been observed in the near-nozzle regions. An enormous volume is occupied by the gasoline vapor, stantial computational cost. Volume-averaging instead of mass-averaging is observed to be more effective, especially for finer mesh resolutions.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1336934
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
Two-phase flow
cavitation
flash boiling
fuel spray
internal nozzle flow