Vapor-Phase Structures of Diesel-Type Fuel Sprays: An Experimental Analysis

Rabenstein, Friedrich; Egermann, Jan; Leipertz, Alfred; D'Alfonso, Nunzio

doi:10.4271/982543

Cited by 17 publications

(6 citation statements)

References 14 publications

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“…Also, modifications of the laser-optical layout to suppress parts of the background have been proposed [58]. The LIF signal is unpolarized, whereas Raman and Rayleigh scattered light is polarized, thus it is possible to recover the Raman signal even under harsh conditions like those spray flames internal combustion engines [112]. At least the LIF background of OH has been used for simultaneous estimation of OH concentrations from Raman/Rayleigh data [22,122,135].…”

Section: Excitation Lasersmentioning

confidence: 99%

Laser diagnostics for studies of turbulent combustion

Hassel

Linow

2000

Meas. Sci. Technol.

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The demands on the quality of velocity, concentration and temperature data from turbulent combustion systems for comparison with numerical predictions are rising with the increasing performance of models for the numerical description of these effects. These demands lead to a high degree of maturity in laser-based methods for concentration, temperature and species information. Laser-based methods are able to give the required information without severely disturbing the observed effects and with the needed accuracy and temporal and spatial resolution. This article reviews the state of the art and recent developments of laser-Doppler velocimetry, Rayleigh spectroscopy, spontaneous Raman spectroscopy, coherent anti-Stokes Raman spectroscopy and laser-induced fluorescence. Emphasis is placed not only on aspects of these measurement techniques connected with spatially and temporally resolved quantitative measurements in turbulent combustion, but also on the interaction of the requirements of these methods on the object with the requirements of the characterized object itself and with demands from methods of numerical prediction on the generated data. New developments and requirements on the reviewed methods originating from new trends in combustion modelling are included.

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Section: Excitation Lasersmentioning

confidence: 99%

Laser diagnostics for studies of turbulent combustion

Hassel

Linow

2000

Meas. Sci. Technol.

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“…Linear Raman spectroscopy allows a quantitative determination of the concentration of all main species inside the measurement volume with high spatial and temporal resolution and is in general the most reliable technique in this field of application. Several authors have already used this technique successfully to investigate the mixture formation process in transparent engines and injection chambers [23][24][25][26][27][28][29][30][31]. A simultaneous application of LIF and Raman has been realized previously by M. Richter et.…”

Section: Spectroscopic Relationsmentioning

confidence: 99%

“…In addition the air/fuel ratio has been measured simultaneously by linear Raman spectroscopy, onedimensionally within the LIF-measurement plane, to compare the results. Further information on the individual measurement techniques and results of previous work in this field of application can be found in several publications [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…A comparison between the results of both measurement techniques shows very good agreements of the air/fuel ratios. Air/Fuel ratio at stratified charge using 2D LIF and 1D Raman simultaneously (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) The Fifth International Symposium on Diagnostics and Modeling of Combustion in Internal Combustion Engines (COMODIA 2001), July 1•4, 2001, Nagoya…”

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confidence: 99%

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(2-16) Two-Dimensional Mapping and Quantification of the In-Cylinder Air/Fuel-Ratio in a GDI Engine by Means of LIF((SI-5)S. I. Engine Combustion 5-In-Cylinder A/F and Temperatures)

Ipp¹,

Egermann²,

Wagner³

et al. 2001

COMODIA

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The optimization of the vaporization and mixture formation process is of great importance for the development of modern gasoline direct injection (GDI) engines, because it influences the subsequent processes of the ignition, combustion and pollutant formation significantly. In consequence, the subject of this work was the development of a measurement technique based on the laser induced fluorescence (LIF), which allows the two dimensional visualization and quantification of the in-cylinder air/fuel ratio. The investigations were carried out in a transparent engine provided by the BMW Group, Munich.

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“…For example, the Raman Spectroscopy is based on the analysis of the inelastic 3 scattering of a laser beam, caused by the fuel molecules. The frequency of the light scattered is characteristic of each specie, and makes it possible to determine the local air-fuel ratio and temperature at the same time [69][70][71][72]. However, the signal is very weak which limits measurement to small areas and requires careful signal-to-noise considerations.…”

Section: The Combustion Process In a Direct Injection Diesel Enginementioning

confidence: 99%

Development of Measurement and Visualization Techniques for Characterization of Mixing and Combustion Processes With Surrogate Fuels

Reche¹

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El desenvolupament y optimització de nous modes de combustió constitueixen actualment un camp important d'investigació, para reduir la emissió de contaminants en motors de combustió internat alternatius. El seu desenvolupament requereix del us de gran varietat de ferramentes experimentals i teòriques, que permeten conèixer i comprendre els seus fonaments. En este context s'emmarca l'objectiu principal d'esta Tesi: la millora i el desenvolupament de tècniques de visualització i mesura, per a conseguir el nivell de detall i la precisió requerits per a estudis actuals i futurs d'esta índole. El treball s'ha basat en la caracterització de la combustió dièsel per difusió per a poder centrar l'estudi en la part metodològica, gràcies a l'ampli coneixement disponible sobre este mode de combustió.El treball s'ha dividit en dos apartats principals. El primer d'ells es centra en la caracterització dels processos d'evaporació i formació de la mescla aire-combustible. Per això, s'ha desenvolupat i posat en pràctica una tècnica basada en la absorció de llum per part de les molècules de combustible (UV-VIS LAS), que permet mesurar la concentració local de combustible evaporat en el si d'un esprai dièsel. Esta ha sigut optimitzada per a ser aplicada en condicions d'operació semblants a les d'un motor d'encesa per compressió i combustibles amb propietats òptiques que no son les òptimes, però els quals són de gran interés en investigació donada la seua simplicitat. A més, s'ha desenvolupat una metodologia per a la mesura del coeficient d'absorció dels combustibles, a les mateixes condicions d'operació (pressió i temperatura) que les que es donen en la cambra de combustió d'un motor d'encesa per compressió. Els resultats obtinguts s'han analitzat amb detall, per a poder definir els límits i la fiabilitat de la metodologia proposada.El segon apartat correspon a la caracterització del procés de combustió i la formació de sutja. Per a això, s'ha desenvolupat un muntatge òptic complex que permés aplicar de forma simultània les tres tècniques més utilitzades en la literatura per a la mesura de la sutja en una flama dièsel: Mètode d'Extinció Làser, Pirometria 2-Colors i Incandescència Induïda per Làser. Els resultats obtinguts per mitjà de les tres tècniques han sigut comparats detalladament, no sols per a identificar els principals avantatges i inconvenients de cada tècnica, sinó també la fiabilitat d'aquestes per a distintes condicions d'operació.

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Vapor-Phase Structures of Diesel-Type Fuel Sprays: An Experimental Analysis

Cited by 17 publications

References 14 publications

Laser diagnostics for studies of turbulent combustion

Laser diagnostics for studies of turbulent combustion

(2-16) Two-Dimensional Mapping and Quantification of the In-Cylinder Air/Fuel-Ratio in a GDI Engine by Means of LIF((SI-5)S. I. Engine Combustion 5-In-Cylinder A/F and Temperatures)

Development of Measurement and Visualization Techniques for Characterization of Mixing and Combustion Processes With Surrogate Fuels

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