Simulation and Measurement of Transient Fluid Phenomena within Diesel Injection

Martin Gold, Richard Pearson, Jack Turner, Dan Sykes, Viacheslav Stetsyuk, Guillaume De Sercey, Cyril Crua, Foivos Koukouvinis, Manolis Gavaises

Research output: Contribution to journalConference article

Abstract

Rail pressures of modern diesel fuel injection systems have increased significantly over recent years, greatly improving atomisation of the main fuel injection event and air utilisation of the combustion process. Continued improvement in controlling the process of introducing fuel into the cylinder has led to focussing on fluid phenomena related to transient response. High-speed microscopy has been employed to visualise the detailed fluid dynamics around the near nozzle region of an automotive diesel fuel injector, during the opening, closing and post injection events. Complementary computational fluid dynamic (CFD) simulations have been undertaken to elucidate the interaction of the liquid and gas phases during these highly transient events, including an assessment of close-coupled injections.
Microscopic imaging shows the development of a plug flow in the initial stages of injection, with rapid transition into a primary breakup regime, transitioning to a finely atomised spray and subsequent vaporisation of the fuel. During closuring of the injector the spray collapses, with evidence of swirling breakup structures together with unstable ligaments of fuel breaking into large slow-moving droplets. This leads to sub-optimal combustion in the developing flame fronts established by the earlier, more fully-developed spray. The simulation results predict these observed phenomena, including injector surface wetting as a result of large slow-moving droplets and post-injection discharge of liquid fuel. This work suggests that post-injection discharges of fuel play a part in the mechanism of the initial formation, and subsequent accumulation of deposits on the exterior surface of the injector. For multiple injections, opening events are influenced by the dynamics of the previous injection closure; these phenomena have been investigated within the simulations.
LanguageEnglish
Number of pages15
JournalSAE Technical Papers
Volume2019-January
Issue numberJanuary
DOIs
Publication statusPublished - 15 Jan 2019
Externally publishedYes
EventSAE - International Powertrains, Fuels & Lubricants Meeting - San Antonio Marriott Riverwalk, San Antonio , United States
Duration: 22 Jan 201924 Jan 2019
https://www.sae.org/attend/ipfl/attend

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Fluids
Fuel injection
Diesel fuels
Automotive fuels
Ligaments
Liquid fuels
Atomization
Fluid dynamics
Vaporization
Transient analysis
Discharge (fluid mechanics)
Wetting
Rails
Nozzles
Microscopic examination
Computational fluid dynamics
Deposits
Imaging techniques
Computer simulation
Liquids

Cite this

Gold, M., Pearson, R., Turner, J., Sykes, D., Stetsyuk, V., De Sercey, G., ... Gavaises, M. (2019). Simulation and Measurement of Transient Fluid Phenomena within Diesel Injection. SAE Technical Papers, 2019-January(January). https://doi.org/10.4271/2019-01-0066
Gold, Martin ; Pearson, Richard ; Turner, Jack ; Sykes, Dan ; Stetsyuk, Viacheslav ; De Sercey, Guillaume ; Crua, Cyril ; Koukouvinis, Foivos ; Gavaises, Manolis. / Simulation and Measurement of Transient Fluid Phenomena within Diesel Injection. In: SAE Technical Papers. 2019 ; Vol. 2019-January, No. January.
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Gold, M, Pearson, R, Turner, J, Sykes, D, Stetsyuk, V, De Sercey, G, Crua, C, Koukouvinis, F & Gavaises, M 2019, 'Simulation and Measurement of Transient Fluid Phenomena within Diesel Injection', SAE Technical Papers, vol. 2019-January, no. January. https://doi.org/10.4271/2019-01-0066

Simulation and Measurement of Transient Fluid Phenomena within Diesel Injection. / Gold, Martin; Pearson, Richard; Turner, Jack; Sykes, Dan; Stetsyuk, Viacheslav; De Sercey, Guillaume; Crua, Cyril; Koukouvinis, Foivos; Gavaises, Manolis.

In: SAE Technical Papers, Vol. 2019-January, No. January, 15.01.2019.

Research output: Contribution to journalConference article

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T1 - Simulation and Measurement of Transient Fluid Phenomena within Diesel Injection

AU - Gold, Martin

AU - Pearson, Richard

AU - Turner, Jack

AU - Sykes, Dan

AU - Stetsyuk, Viacheslav

AU - De Sercey, Guillaume

AU - Crua, Cyril

AU - Koukouvinis, Foivos

AU - Gavaises, Manolis

PY - 2019/1/15

Y1 - 2019/1/15

N2 - Rail pressures of modern diesel fuel injection systems have increased significantly over recent years, greatly improving atomisation of the main fuel injection event and air utilisation of the combustion process. Continued improvement in controlling the process of introducing fuel into the cylinder has led to focussing on fluid phenomena related to transient response. High-speed microscopy has been employed to visualise the detailed fluid dynamics around the near nozzle region of an automotive diesel fuel injector, during the opening, closing and post injection events. Complementary computational fluid dynamic (CFD) simulations have been undertaken to elucidate the interaction of the liquid and gas phases during these highly transient events, including an assessment of close-coupled injections.Microscopic imaging shows the development of a plug flow in the initial stages of injection, with rapid transition into a primary breakup regime, transitioning to a finely atomised spray and subsequent vaporisation of the fuel. During closuring of the injector the spray collapses, with evidence of swirling breakup structures together with unstable ligaments of fuel breaking into large slow-moving droplets. This leads to sub-optimal combustion in the developing flame fronts established by the earlier, more fully-developed spray. The simulation results predict these observed phenomena, including injector surface wetting as a result of large slow-moving droplets and post-injection discharge of liquid fuel. This work suggests that post-injection discharges of fuel play a part in the mechanism of the initial formation, and subsequent accumulation of deposits on the exterior surface of the injector. For multiple injections, opening events are influenced by the dynamics of the previous injection closure; these phenomena have been investigated within the simulations.

AB - Rail pressures of modern diesel fuel injection systems have increased significantly over recent years, greatly improving atomisation of the main fuel injection event and air utilisation of the combustion process. Continued improvement in controlling the process of introducing fuel into the cylinder has led to focussing on fluid phenomena related to transient response. High-speed microscopy has been employed to visualise the detailed fluid dynamics around the near nozzle region of an automotive diesel fuel injector, during the opening, closing and post injection events. Complementary computational fluid dynamic (CFD) simulations have been undertaken to elucidate the interaction of the liquid and gas phases during these highly transient events, including an assessment of close-coupled injections.Microscopic imaging shows the development of a plug flow in the initial stages of injection, with rapid transition into a primary breakup regime, transitioning to a finely atomised spray and subsequent vaporisation of the fuel. During closuring of the injector the spray collapses, with evidence of swirling breakup structures together with unstable ligaments of fuel breaking into large slow-moving droplets. This leads to sub-optimal combustion in the developing flame fronts established by the earlier, more fully-developed spray. The simulation results predict these observed phenomena, including injector surface wetting as a result of large slow-moving droplets and post-injection discharge of liquid fuel. This work suggests that post-injection discharges of fuel play a part in the mechanism of the initial formation, and subsequent accumulation of deposits on the exterior surface of the injector. For multiple injections, opening events are influenced by the dynamics of the previous injection closure; these phenomena have been investigated within the simulations.

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JO - SAE Technical Papers

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