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Single Orifice Diesel Injector Flow Characterization and the Impact of Needle Lift Using Large Eddy Simulation and Proper Orthogonal Decomposition

[+] Author and Article Information
Mohamed Chouak

Thermofluids for Transportation Laboratory (TFT) Department of Mechanical Engineering, École de Technologie Supérieure, Montréal, Canada
mohamed.chouak.1@ens.etsmtl.ca

Louis Dufresne

Thermofluids for Transportation Laboratory (TFT) Department of Mechanical Engineering, École de Technologie Supérieure, Montréal, Canada
louis.dufresne@etsmtl.ca

Patrice Seers

Thermofluids for Transportation Laboratory (TFT) Department of Mechanical Engineering, École de Technologie Supérieure, Montréal, Canada
patrice.seers@etsmtl.ca

1Corresponding author.

ASME doi:10.1115/1.4041642 History: Received February 13, 2018; Revised September 27, 2018

Abstract

The flow in the injector's sac volume has been reported to influence diesel-injector nozzle flow, but few studies have characterized sac volume. Our study modeled flow in the sac volume using a large eddy simulation (LES) approach to gain better insight into the complexity of the flow dynamics. It focused on the effect of fixed needle lifts on sac-volume internal flow of a single-hole injector with emphasis on large-scale unsteadiness; 3-D proper orthogonal decomposition (POD) was used to analyze the flow. The main findings are: (1) an enlarging flow jet entering the sac volume with decreasing small scales of turbulence was observed as needle lift increased. (2) 3-D POD revealed that the mean flow energy was nearly constant at low needle lifts (6%, 8%, and 10%) and decreased two-fold at the higher needle lift of 31%. (3) The analysis of fluctuating modes revealed that flow restructuring occurred with increasing needle lift as three different energy distributions were observed with the lowest (6%), intermediary (8%, 10%, and 16%), and highest needle lifts (31%). (4) Lastly, the analysis of the POD-reduced-order model has shown that the lowest frequency of mode 1, which carries the highest fluctuating energy, is responsible for the oscillation of the main rotating structure within the sac volume that causes fuel-jet enlarging/narrowing with time. This oscillation of the main structure was found to decrease with increased needle lift.

Copyright (c) 2018 by ASME
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