Experimental Investigations of Flow and Temperature Fields in an SI Engine and Comparison with Numerical Analysis

Engström, Johan; Kaminski, CF; Aldén, Marcus; Josefsson, Göran; Magnusson, Ingemar

doi:10.4271/1999-01-3541

Cited by 1 publication

(5 citation statements)

References 11 publications

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“…A beam splitter was used to separate the two fluorescence signals. A similar experimental set-up can be seen in [25].…”

Section: Simultaneous Indium/oh Lif Measurementsmentioning

confidence: 98%

“…This is described in more detail in section 4.5. Only temperatures higher than 700 K are displayed in the images, corresponding roughly to the lowest temperature where indium TLAF becomes sensitive [25]. All other pixels were ignored in the calculations, i.e.…”

Section: Spectroscopic Studiesmentioning

confidence: 99%

“…For example, in highly sooting areas no temperature information will be conducted with OH thermometry. Therefore the evaluated temperatures are expected to reveal that the OH thermometry is towards the high temperature regions, where most OH-radicals are produced [25,36]. Furthermore, in lean combustion where a lot of OH and O 2 are present the fluorescence signal from the indium atoms will not be sufficiently high to yield temperature information if the seeding concentration is not increased.…”

Section: Simultaneous Measurements Of Oh and Indium Fluorescencementioning

confidence: 99%

“…If the indium atoms had influenced the combustion process and the chemical reactions, a change should have been seen in the soot volume fraction between the different seeding solutions, with and without indium, and on the particle sizes. The possible influence on the soot volume fraction caused by the water is not a problem, since in more practical applications, such as engines and turbines, the indium can be directly dissolved in the fuel and no water needs to be added [25,29,39].…”

Section: Laser-induced Incandescence Measurementsmentioning

confidence: 99%

“…Further, due to low signal levels THAF does not seem to be applicable for temperature measurements in engines on single shot basis. Two-line atomic fluorescence (TLAF), on the other hand, has recently been reported to provide this [25]. TLAF is based on suitable atoms being seeded into the combustion region and indium has been pointed out to be an attractive candidate for practical combustion, since it is sensitive over a wide temperature range (700-3000 K) [26].…”

Section: Introductionmentioning

confidence: 99%

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Applications and evaluation of two-line atomic LIF thermometry in sooting combustion environments

Nygren

Engström

Walewski

et al. 2001

Meas. Sci. Technol.

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Temperature measurements using planar laser-induced fluorescence (PLIF) are most often associated with experimental challenges. In addition, no PLIF technique is generally applicable in all kinds of environment. Especially under sooting conditions problems are prone to arise, which limits the use of these techniques. In this paper the two-line atomic fluorescence (TLAF) technique was investigated in sooting environments. Indium atoms were used as thermometry species and seeded into the combustion region. Data from two-dimensional measurements are often difficult to analyse, because of problems with treating noise. A statistical analysis method for correction of laser fluctuations was developed to increase the precision of the temperature calculations. The results show that TLAF holds promise for temperature measurements in rich combustion, such as diesel engines, where other techniques have proven to fail. Drawbacks with the TLAF technique are that the probe volume is biased towards the post-flame zone and that seeding is required. The statistical analysis improved the precision considerably and is suitable for evaluation of other two-dimensional thermometry techniques. This paper also presents a critical review and comparison with alternatives, such as OH and NO thermometry.

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“…A beam splitter was used to separate the two fluorescence signals. A similar experimental set-up can be seen in [25].…”

Section: Simultaneous Indium/oh Lif Measurementsmentioning

confidence: 98%

Section: Spectroscopic Studiesmentioning

confidence: 99%

Section: Simultaneous Measurements Of Oh and Indium Fluorescencementioning

confidence: 99%

Section: Laser-induced Incandescence Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%