This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Planar Measurements of OH Radicals in an S.I. Engine Based on Laser Induced Flourescence
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1994 by SAE International in United States
Annotation ability available
The planar laser induced fluorescence (PLIF) technique was applied to two dimensional visualization of OH radicals in a combustion flame. A frequency doubled Nd:YAG laser pumped dye laser was used to form a laser light sheet which excited the OH X2Π-A2Σ transition. A fluorescence image of the OH radical and a visible image of a combustion flame were simultaneously imaged by a pair of CCD cameras with image intensifiers. Measurement of the OH radical in the combustion flame could be carried out by using this PLIF technique without Mie scattering lights from soot particles and other optical disturbances.
The PLIF technique was employed to study the OH radical in the combustion chamber of a spark ignition (S. I.) engine using gasoline as fuel. Measurements of the OH radical fluorescence were carried out under various operating conditions of mass burned fraction, swirl ratio and air-fuel ratio. Images of the OH radical fluorescence were very complicated in structure compared with visible images of the combustion flame in the engine. The fluorescence distribution of the OH radical was not only observed in the near-flame front but also in the post flame gases. The fluorescence intensity of the OH radical increased with the progress of the combustion. The OH radical fluorescence intensity reached a peak value and the concentration of HC emissions in the exhaust gases indicated a minimum value at the optimum swirl ratio. Both the OH radical fluorescence intensity and the concentration of NOx emissions in the exhaust gases reached a peak value at the near-stoichiometric air-fuel ratio.
CitationTanaka, T. and Tabata, M., "Planar Measurements of OH Radicals in an S.I. Engine Based on Laser Induced Flourescence," SAE Technical Paper 940477, 1994, https://doi.org/10.4271/940477.
SAE 1994 Transactions: Journal of Fuels and Lubricants
Number: V103-4; Published: 1995-09-01
Number: V103-4; Published: 1995-09-01
- Dyer, M. J Crosley, D. R. Two-Dimensional Imaging of OH Laser-Induced Fluorescence in a Flame Optics Letters 7 8 382 384 1982
- Kychakoff, G. Hanson, R. K. Howe, R. D. Simultaneous Multiple-Point Measurements of OH in Combustion Gases Using Planar Laser-Induced Fluorescence Twentieth Symposium (International) on Combustion 1265 1272 1984
- Kychakoff, G. Howe, R. D. Hanson, R. K. Quantitative Flow Visualization Technique for Measurements in Combustion Gases Applied Optics 23 5 704 712 1984
- Gutmark, E. Parr, T. P. Hanson-Parr, D. M. Schadow, K. C. Azimuthal Structure of an Annular Diffusion Flame Combustion and Flame 75 229 240 1989
- Koch, A. Chryssostomou, A. Andresen, P. Bornscheuer, W. Multi-Species Detection in Spray Flames with Tunable Excimer Lasers Applied Physics B56 165 176 1993
- Cattolica, R. J. Vosen, S. R. Two-Dimensional Measurements of the [OH] in a Constant Volume Combustion Chamber Twentieth Symposium (International) on Combustion 1273 1282 1984
- Felton, P. G. Mantzaras, J. Bomse, D. S. Woodin, R. L. Initial Two-Dimensional Laser Induced Fluorescence Measurements of OH Radicals in an Internal Combustion Engine SAE Paper, 881633 1988
- Andresen, P. Meijer, G Schlüter, H. Voges, H. Koch, A. Hentschel, W. Oppermann, W. Rothe, E. Fluorescence Imaging inside an Internal Combustion Engine Using Tunable Excimer Lasers Applied Optics 29 16 2392 2404 1990
- Dieke, G. H. Crosswhite, H. M. The Ultraviolet Bands of OH (Fundamental Data) Journal of Quantitative Spectroscopy & Radiative Transfer 2 97 199 1961