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Title: Mechanisms of spray formation and combustion from a multi-hole injector with E85 and gasoline

Abstract

The spray formation and combustion characteristics of gasoline and E85 (85% ethanol, 15% gasoline) have been investigated using a multi-hole injector with asymmetric nozzle-hole arrangement. Experiments were carried out in a quiescent optical chamber using high-speed shadowgraphy (9 kHz) to characterise the spray sensitivity to both injector temperature and ambient pressure in the range of 20-120 C and 0.5, 1.0 bar. Spray-tip penetrations and 'umbrella' spray cone angles were calculated for all conditions. Phase Doppler Anemometry was also used to measure droplet sizes in the core of one of the spray plumes, 25 mm below the injector tip. To study the effect of fuel properties on vaporisation and mixture preparation under realistic operating conditions, a separate set of experiments was carried out in a direct-injection spark-ignition optical engine. The engine was run at 1500 RPM under cold and fully warmed-up conditions (20 C and 90 C) at part load and full load (0.5 and 1.0 bar intake pressure). Floodlit laser Mie-scattering images of the sprays on two orthogonal planes corresponding to the swirl and tumble planes of in-cylinder flow motion were acquired to study the full injection event and post-injection mixing stage. These were used to make comparisons with themore » static chamber sprays and to quantify the liquid-to-vapour phase evaporation process for both fuels by calculating the projected 'footprint' of the sprays at different conditions. Analysis of the macroscopic structure and turbulent primary break-up properties of the sprays was undertaken in light of jet exit conditions described in terms of non-dimensional numbers. The effects on stoichiometric combustion were investigated by imaging the natural flame chemiluminescence through the engine's piston crown (swirl plane) and by post-processing to derive flame growth rates and trajectories of flame motion. (author)« less

Authors:
; ;  [1];  [2];  [3]
  1. Department of Mechanical Engineering, University College London (United Kingdom)
  2. Ford Motor Company, Dunton Engineering Centre (United Kingdom)
  3. Ford Werke GmbH, Merkenich, Cologne (Germany)
Publication Date:
OSTI Identifier:
21305679
Resource Type:
Journal Article
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 157; Journal Issue: 4; Other Information: Elsevier Ltd. All rights reserved; Journal ID: ISSN 0010-2180
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; GASOLINE; COMBUSTION; SPRAYS; INJECTION; VAPORS; CHEMILUMINESCENCE; GASOHOL; FLAMES; COMPARATIVE EVALUATIONS; COMBUSTION PROPERTIES; DROPLETS; EVAPORATION; LIQUIDS; MIXTURES; ASYMMETRY; CONES; CYLINDERS; IGNITION; IMAGES; MIXING; NOZZLES; PLUMES; SENSITIVITY ANALYSIS; STOICHIOMETRY; TRAJECTORIES; VELOCITY; TEMPERATURE RANGE 0273-0400 K; PRESSURE RANGE KILO PA; SIZE; DIRECT INJECTION ENGINES; SPARK IGNITION ENGINES; TEMPERATURE DEPENDENCE; PRESSURE DEPENDENCE; Spray formation; E85; DISI engines

Citation Formats

Aleiferis, P G, Serras-Pereira, J, van Romunde, Z, Caine, J, and Wirth, M. Mechanisms of spray formation and combustion from a multi-hole injector with E85 and gasoline. United States: N. p., 2010. Web. doi:10.1016/J.COMBUSTFLAME.2009.12.019.
Aleiferis, P G, Serras-Pereira, J, van Romunde, Z, Caine, J, & Wirth, M. Mechanisms of spray formation and combustion from a multi-hole injector with E85 and gasoline. United States. doi:10.1016/J.COMBUSTFLAME.2009.12.019.
Aleiferis, P G, Serras-Pereira, J, van Romunde, Z, Caine, J, and Wirth, M. Thu . "Mechanisms of spray formation and combustion from a multi-hole injector with E85 and gasoline". United States. doi:10.1016/J.COMBUSTFLAME.2009.12.019.
@article{osti_21305679,
title = {Mechanisms of spray formation and combustion from a multi-hole injector with E85 and gasoline},
author = {Aleiferis, P G and Serras-Pereira, J and van Romunde, Z and Caine, J and Wirth, M},
abstractNote = {The spray formation and combustion characteristics of gasoline and E85 (85% ethanol, 15% gasoline) have been investigated using a multi-hole injector with asymmetric nozzle-hole arrangement. Experiments were carried out in a quiescent optical chamber using high-speed shadowgraphy (9 kHz) to characterise the spray sensitivity to both injector temperature and ambient pressure in the range of 20-120 C and 0.5, 1.0 bar. Spray-tip penetrations and 'umbrella' spray cone angles were calculated for all conditions. Phase Doppler Anemometry was also used to measure droplet sizes in the core of one of the spray plumes, 25 mm below the injector tip. To study the effect of fuel properties on vaporisation and mixture preparation under realistic operating conditions, a separate set of experiments was carried out in a direct-injection spark-ignition optical engine. The engine was run at 1500 RPM under cold and fully warmed-up conditions (20 C and 90 C) at part load and full load (0.5 and 1.0 bar intake pressure). Floodlit laser Mie-scattering images of the sprays on two orthogonal planes corresponding to the swirl and tumble planes of in-cylinder flow motion were acquired to study the full injection event and post-injection mixing stage. These were used to make comparisons with the static chamber sprays and to quantify the liquid-to-vapour phase evaporation process for both fuels by calculating the projected 'footprint' of the sprays at different conditions. Analysis of the macroscopic structure and turbulent primary break-up properties of the sprays was undertaken in light of jet exit conditions described in terms of non-dimensional numbers. The effects on stoichiometric combustion were investigated by imaging the natural flame chemiluminescence through the engine's piston crown (swirl plane) and by post-processing to derive flame growth rates and trajectories of flame motion. (author)},
doi = {10.1016/J.COMBUSTFLAME.2009.12.019},
journal = {Combustion and Flame},
issn = {0010-2180},
number = 4,
volume = 157,
place = {United States},
year = {2010},
month = {4}
}