3D analysis of vapor and liquid phase of GDI injectors using laser induced exciplex fluorescence tomography in a high pressure/high temperature spray chamber

Rogler, Philipp; Grzeszik, R.; Arndt, Stefan; Aigner, Manfred

doi:10.4271/2007-01-1827

Cited by 11 publications

(9 citation statements)

References 3 publications

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“…20 A wide range of non-intrusive diagnostics have also been employed to study the spray and entrainment field. These include schlieren and shadowgraphy, Mie and Rayleigh scattering [17,[20][21][22], diffuse backlit illumination (DBI) [23][24][25], particle image velocimetry [12,26,27], laser absorption scattering [28], Raman spectroscopy [29] and laser induced fluorescence (LIF) [30][31][32][33] among others. Phase doppler interferometry (PDI) is also commonly used to measure droplet size and velocity where the flow is sufficiently dilute [21, 22, 25 …”

Section: Introductionmentioning

confidence: 99%

Internal and near nozzle measurements of Engine Combustion Network “Spray G” gasoline direct injectors

Duke

Kastengren

Matusik

et al. 2017

Experimental Thermal and Fluid Science

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Gasoline direct injection (GDI) sprays are complex multiphase flows. When compared to multi-hole diesel sprays, the plumes are closely spaced, and the sprays are more likely to interact. The effects of multi-jet interaction on entrainment and spray targeting can be influenced by small variations in the mass fluxes from the holes, which in turn depend on transients in the needle movement and small-scale details of the internal geometry. In this paper, we present a comprehensive overview of a multi-institutional effort to experimentally characterize the internal geometry and near-nozzle flow of the Engine Combustion Network (ECN) Spray G gasoline injector. In order to develop a complete picture of the near-nozzle flow, a standardized setup was shared between facilities. A wide range of techniques were employed, including both x-ray and visible-light diagnostics. The novel aspects of this work include both new experimental measurements, and a comparison of the results across different techniques and facilities. The breadth and depth of the data reveal phenomena which were not apparent from analysis of the individual data sets. We show that plume-to-plume variations in the mass fluxes from the holes can cause large-scale asymmetries in the entrainment field and spray structure.Both internal flow transients and small-scale geometric features can have an effect on the external flow. The sharp turning angle of the flow into the holes also causes an inward vectoring of the plumes relative to the hole drill angle, which increases with time due to entrainment of gas into a low-pressure region between the plumes. These factors increase the likelihood of spray collapse with longer injection durations.

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Section: Introductionmentioning

confidence: 99%

Internal and near nozzle measurements of Engine Combustion Network “Spray G” gasoline direct injectors

Duke

Kastengren

Matusik

et al. 2017

Experimental Thermal and Fluid Science

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“…This has also been demonstrated in combination with infrared absorption tomography. infrared 10.4 Exciplex imaging of two sprays from a multihole injector (top) and an annular orifice injector (bottom) at p amb = 0.94 MPa and T amb = 220°C, t = 800 ms after start of injection (Rogler et al, 2007 (krämer et al, 1998). Other tomographic applications for ic engine work have been summarized elsewhere (Sick and Mccann, 2005).…”

Section: Fuel/air/exhaust Mixingmentioning

confidence: 99%

“…Laser excitation of a combination of tracers leads to the formation of an excited complex in the liquid but not the gas phase. This complex emits light at a longer wavelength than any of the tracers and therefore signals can be separated from each other (knapp et al, 1996;Rogler et al, 2007). The major drawback of exciplex imaging is the sensitivity to oxygen quenching which makes quantitative measurements very challenging.…”

Section: Fuel/air/exhaust Mixingmentioning

confidence: 99%

Optical diagnostics for direct injection gasoline engine research and development

Sick

2010

Advanced Direct Injection Combustion Engine Technologies and Development

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“…More recently Rogler et al [27] reported on 3-D visualisation and analysis of vapour and liquid phase of gasoline injectors using the LIEF technique in a high pressure/high temperature chamber. In addition, Zhang et al [28] investigated flash boiling phenomenon which occur at some operating conditions when fuel is injected into the cylinder of a direct injection spark ignition engine.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous imaging of diesel spray atomisation and evaporation processes in a single-cylinder CR diesel engine

Herfatmanesh

Attar

Zhao

2013

Experimental Thermal and Fluid Science

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This document is the Accepted Manuscript version of the following article: Mohammad Reza Herfatmanesh, Mohammadreza Anbari Attar, and Hua Zhao, ???Simultaneous imaging of diesel spray atomisation and evaporation processes in a single-cylinder CR diesel engine???, Experimental Thermal and Fluid Science, Vol. 50, pp. 10-20, October 2013. ?? 2013 Elsevier Inc. This manuscript version is made available under the terms of the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The Version of Record is available online at DOI: https://doi.org/10.1016/j.expthermflusci.2013.04.019 :In direct injection diesel engines, combustion and formation of pollutants are directly influenced by the spatial and temporal distributions of the injected fuel. In this study mixture formation during the pre-combustion phase of a diesel engine was investigated using the laser-induced exciplex fluorescence (LIEF) technique. The main purpose of this investigation was to develop an experimental setup capable of providing the full-field view of both liquid and vapour phases of evaporating diesel sprays during the fuel injection process inside the combustion chamber of a diesel engine with optical access. An expanded laser beam was employed for full combustion chamber visualisation. In this study two model fuels were tested; one consisted of 89% decane, 10% ??-methyl-naphthalene and 1% TMPD and the other 88% decane, 10% ??-methyl-naphthalene and 2% TMPD. The spray atomisation and evaporation processes during the pre-combustion phase of a diesel engine were measured at an injection pressure of 1200 bar and the engine speed of 1500 rpm. The results demonstrated the capability of the full-field LIEF technique in simultaneous imaging of liquid fraction and fuel vapour distribution during high pressure fuel injection process. It also highlighted the effect of dopant concentration on the fluorescence intensity of liquid and vapour signals. The exciplex system containing 1% TMPD produced better visualisation of the liquid phase, though the crosstalk in the vapour phase precluded accurate detection of the vapour phase signal. In contrast, the exciplex system containing 2% TMPD resulted in satisfactory visualisation of the vapour phase; however the intensity of the liquid phase was compromised as a result. This was presumed to be mainly due to the spectral shift of the exciplex species and/or TMPD decomposition at elevated temperatures and pressures. ?? 2013 Elsevier Inc. All rights reserved

show abstract

3D analysis of vapor and liquid phase of GDI injectors using laser induced exciplex fluorescence tomography in a high pressure/high temperature spray chamber

Cited by 11 publications

References 3 publications

Internal and near nozzle measurements of Engine Combustion Network “Spray G” gasoline direct injectors

Internal and near nozzle measurements of Engine Combustion Network “Spray G” gasoline direct injectors

Optical diagnostics for direct injection gasoline engine research and development

Simultaneous imaging of diesel spray atomisation and evaporation processes in a single-cylinder CR diesel engine

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