Demonstration of Two-Dimensional Temperature Characterization of Valves and Transparent Piston in a GDI Optical Engine

Omrane, Alaa; Juhlin, Greger; Aldén, Marcus; Josefsson, Göran; Engström, Johan; Benham, Timothy

doi:10.4271/2004-01-0609

Cited by 32 publications

(18 citation statements)

References 14 publications

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“…In terms of comparative performance of the methods, Omrane et al (2004) performed very precise and accurate temperature measurements for piston surfaces in transparent engines, with the intensity ratio (2D measurements at 0.5 Hz) as well as the decay-time method (point measurements at 1 Hz), obtaining 3 and 0.5% accuracy, respectively, for a temperature range of 320-870 K. Fuhrmann et al (2013a, b) compared the luminescence lifetime and the intensity ratio method using MG 4 FGeO 6 :Mn also reporting an improved precision in the case of the lifetime approach. Bizzak and Chyu (1995) used successfully the intensity ratio method to investigate the heat transfer of a hot plate cooled by an air nozzle and an accuracy of around 5% was estimated for the heat transfer at the stagnation point calculated after temperature measurements.…”

Section: Introductionmentioning

confidence: 99%

Planar measurements of spray-induced wall cooling using phosphor thermometry

et al. 2018

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The wall cooling induced by spray impingement is investigated using phosphor thermometry. Thin coatings of zinc oxide (ZnO) phosphor were applied with a transparent chemical binder onto a steel surface. Instantaneous spatially resolved temperatures were determined using the spectral intensity ratio method directly after the injection of UV-grade hexane onto the surface using a commercial gasoline injector. The investigations showed that 2D temperature measurements with high spatial and shot-to-shot precision of, respectively, 0.5 and 0.6 K can be achieved, allowing the accurate resolution of the cooling induced by the spray. The presence of a liquid film over the phosphor coating during measurements showed no noticeable influence on the measured temperatures. However, in some cases a change in the intensity ratio at the spray impingement area, in the form of a permanent "stain", could be observed after multiple injections. The formation of this stain was less likely with increasing annealing time of the coating as well as lower plate operating temperatures during the injection experiments. Finally, the experimental results indicate a noticeable influence of the thickness of the phosphor coating on the measured spray-induced wall cooling history. Hence, for quantitative analysis, a compromise between coating thickness and measurement accuracy needs to be considered for similar applications where the heat transfer rates are very high.

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Section: Introductionmentioning

confidence: 99%

Planar measurements of spray-induced wall cooling using phosphor thermometry

et al. 2018

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“…They used a photomultiplier tube for capturing the luminescence decay and performing point-wise temperature measurements on the piston crown and intake valves. Another study used the intensity-ratio approach to resolve piston and valve temperatures two-dimensionally using an intensified charge-coupled device camera (ICCD) and an image doubler in an optical direct injection stratified-charge engine [1]. Results were shown for different times after initial firing of the engine.…”

Section: Introductionmentioning

confidence: 99%

“…A short overview of wall temperature-measurements in engines can be found in [1]. The most promising candidate of all methods applied is the phosphor thermometry.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional cycle-resolved exhaust valve temperature measurements in an optically accessible internal combustion engine using thermographic phosphors

et al. 2011

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Phosphor thermometry was employed to measure the temperature distribution of the exhaust valves in an optically accessible direct injection internal combustion engine. A CMOS high-speed camera was used to twodimensionally resolve the temperature dependent luminescence decay of the phosphor Gd 3 Ga 5 O 12 :Cr. Measurements were performed under motored and fired conditions for several degrees crank angle to determine the temperature distributions within cycles. Additionally, several binders have been tested in terms of survivability and signal strength to guarantee ideal phosphor coating.

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“…This technique exploits the temperature-dependent light emission (phosphorescence) characteristics of rare-earth-doped ceramic phosphors. An extensive review of the phosphorescence technique is provided in Reference [10] while several publications are available which report on various applications of the technique in a range of environments including IC engines [10][11][12][13] and gas turbines [14,15]. The principal advantages of the phosphorescence technique are that it provides non-intrusive and emissivity-independent wall temperature measurements.…”

Section: Laser-induced Phosphorescence Thermographymentioning

confidence: 99%

Optical Engines as Representative Tools in the Development of New Combustion Engine Concepts

Kashdan

Thirouard

2011

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Résumé -Moteurs transparents comme outils représentatifs dans le développement de nouveaux concepts des moteurs à combustion interne -Les moteurs monocylindres transparents sont employés comme outils de recherche et de développement des moteurs à combustion interne. Ils permettent l'utilisation de techniques de diagnostics non-intrusifs (qualitatifs et quantitatifs) pour étudier des phénomènes comme l'aérodynamique interne, la préparation du mélange, la combustion et la formation de polluants. Ces données expérimentales sont importantes pour la validation des modèles numériques et permettent également d'obtenir une compréhension détaillée des phénomènes physiques se déroulant dans la chambre. Les données recueillies aident au développement des nouvelles stratégies de combustion telles que la combustion homogène (HCCI) et la combustion Diesel à basse température (LTC). Dans ce contexte, il est important de s'assurer que le fonctionnement des moteurs transparents est tout à fait comparable et représentatif de celui des moteurs standards (opaques). Une comparaison du comportement de la combustion et des émissions des moteurs transparents et opaques a été réalisée. L'objectif était d'étudier les différences principales entre le moteur transparent et le moteur opaque et de comprendre comment ces différences peuvent influencer les phases de préparation du mélange, la combustion et la formation de polluants. Les résultats expérimentaux révèlent l'influence significative des différences liées à la température des parois de la chambre de combustion. Des mesures de la température des parois ont été effectuées par la technique de phosphorescence induite par laser. Ces mesures ont permis de définir des stratégies de fonctionnement moteur permettant de compenser les différences de température de paroi entre les deux moteurs. En outre, l'impact des différences géométriques des chambres a été investiguée. La réhausse piston peut subir soit un chargement mécanique dynamique (effets de compression ou de traction) soit une expansion thermique. Ces effets peuvent faire varier le taux de compression effectif. La charge admise dans les moteurs transparents est souvent diluée par de l'EGR simulé au lieu d'utiliser l'EGR réel. Dans les conditions de Diesel LTC, une comparaison a été effectuée entre l'utilisation d'EGR réel et d'EGR simulé par un gaz diluant pur. Enfin, les carburants mono-composants (carburants purs) sont souvent utilisés dans les moteurs Diesel transparents en raison des contraintes imposées par l'utilisation de techniques de diagnostics optiques. Cependant, les carburants purs diffèrent quelque peu des carburants Diesel réels, en particulier au travers de leur indice de cétane et de leur volatilité. Ces différences peuvent influencer fortement le comportement de la combustion et des émissions dans les moteurs transparents. Ces aspects ont été également traités dans cette étude. Une meilleure compréhension des différences de comportement entre les moteurs monocylindres transparents et moteurs standards (opaques) a pe...

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Demonstration of Two-Dimensional Temperature Characterization of Valves and Transparent Piston in a GDI Optical Engine

Cited by 32 publications

References 14 publications

Planar measurements of spray-induced wall cooling using phosphor thermometry

Planar measurements of spray-induced wall cooling using phosphor thermometry

Two-dimensional cycle-resolved exhaust valve temperature measurements in an optically accessible internal combustion engine using thermographic phosphors

Optical Engines as Representative Tools in the Development of New Combustion Engine Concepts

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