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Analysis of transient flows in gasoline direct injection systems: effects on unsteady air entrainment by the spray; Analyse des ecoulements transitoires dans les systemes d'injection directe essence: effets sur l'entrainement d'air instationnaire du spray

Abstract

The aim of this study is to determine instantaneous liquid flow rate oscillations effect on non stationary air entrainment of an injector conical spray (Gasoline Direct Injection). The tools we use are either experimental or numerical ones. An instantaneous flow rate determination method is used. It is based on pulsated flows physics and only requires the velocity at the centerline of a pipe mounted just before the injector. So, it is possible to 'rebuild' the instantaneous velocity distributions and then to get the instantaneous liquid flow rate (Laser Doppler Anemometry measurements). A mechanical and hydraulics modeling software (AMESim) is necessary to get injector outlet flow rate. Simulations are validated by both 'rebuilding' method results and common rail pressure measurements. Fluorescent Particle Image Velocimetry (FPIV), suited to dense two -phase flows, is used to measure air flow around and inside the conical spray. Velocity measurements close to the spray frontier are used to compute instantaneous air entrainment. Considering droplets momentum exchange with air and thanks to droplets diameters and liquid velocities measurements at the nozzle exit, a transient air entrainment model is proposed according to FPIV measurements. (author)
Authors:
Publication Date:
Mar 15, 2005
Product Type:
Thesis/Dissertation
Report Number:
FRNC-TH-6617
Reference Number:
RN07000068; TVI: 0610
Resource Relation:
Other Information: TH: These energetique et transferts; 108 refs.
Subject:
33 ADVANCED PROPULSION SYSTEMS; 42 ENGINEERING; DIRECT INJECTION ENGINES; SPRAYS; FUEL INJECTION SYSTEMS; FLOW RATE; LASER DOPPLER ANEMOMETERS; FLOW VISUALIZATION; VELOCITY; PRESSURE GRADIENTS; LAMINAR FLOW; WAVE PROPAGATION; SOUND WAVES; TRANSIENTS; AIR FLOW; DRAG; DENSITY; COMPUTERIZED SIMULATION; VORTICES; TWO-PHASE FLOW; REYNOLDS NUMBER; DROPLETS
OSTI ID:
20802728
Research Organizations:
Institut National Polytechnique, 31 - Toulouse (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR0603376
Availability:
Commercial reproduction prohibited; OSTI as DE20802728
Submitting Site:
FR
Size:
275 pages
Announcement Date:
Dec 20, 2006

Citation Formats

Delay, G. Analysis of transient flows in gasoline direct injection systems: effects on unsteady air entrainment by the spray; Analyse des ecoulements transitoires dans les systemes d'injection directe essence: effets sur l'entrainement d'air instationnaire du spray. France: N. p., 2005. Web.
Delay, G. Analysis of transient flows in gasoline direct injection systems: effects on unsteady air entrainment by the spray; Analyse des ecoulements transitoires dans les systemes d'injection directe essence: effets sur l'entrainement d'air instationnaire du spray. France.
Delay, G. 2005. "Analysis of transient flows in gasoline direct injection systems: effects on unsteady air entrainment by the spray; Analyse des ecoulements transitoires dans les systemes d'injection directe essence: effets sur l'entrainement d'air instationnaire du spray." France.
@misc{etde_20802728,
title = {Analysis of transient flows in gasoline direct injection systems: effects on unsteady air entrainment by the spray; Analyse des ecoulements transitoires dans les systemes d'injection directe essence: effets sur l'entrainement d'air instationnaire du spray}
author = {Delay, G}
abstractNote = {The aim of this study is to determine instantaneous liquid flow rate oscillations effect on non stationary air entrainment of an injector conical spray (Gasoline Direct Injection). The tools we use are either experimental or numerical ones. An instantaneous flow rate determination method is used. It is based on pulsated flows physics and only requires the velocity at the centerline of a pipe mounted just before the injector. So, it is possible to 'rebuild' the instantaneous velocity distributions and then to get the instantaneous liquid flow rate (Laser Doppler Anemometry measurements). A mechanical and hydraulics modeling software (AMESim) is necessary to get injector outlet flow rate. Simulations are validated by both 'rebuilding' method results and common rail pressure measurements. Fluorescent Particle Image Velocimetry (FPIV), suited to dense two -phase flows, is used to measure air flow around and inside the conical spray. Velocity measurements close to the spray frontier are used to compute instantaneous air entrainment. Considering droplets momentum exchange with air and thanks to droplets diameters and liquid velocities measurements at the nozzle exit, a transient air entrainment model is proposed according to FPIV measurements. (author)}
place = {France}
year = {2005}
month = {Mar}
}