Raman line imaging for spatially and temporally resolved mole fraction measurements in internal combustion engines

被引:54
作者
Miles, PC [1 ]
机构
[1] Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA
关键词
D O I
10.1364/AO.38.001714
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
An optical diagnostic system based on line imaging of Raman scattered light has been developed to study the mixing processes in internal combustion engines. The system permits multipoint, single laser-shot measurements of CO2, O-2, N-2, C3H8, and H2O mole fractions with submillimeter spatial resolution. Selection of appropriate system hardware is discussed, as are subsequent data reduction and analysis procedures. Results are reported for data obtained at multiple crank angles and in two different engine flow fields. Measurements are made at 12 locations simultaneously, each location having measurement volume dimensions of 0.5 mm x 0.5 mm x 0.9 mm. The data are analyzed to obtain statistics of species mole fractions: mean, rms, histograms, and both spatial and cross-species covariance functions. The covariance functions are used to quantify the accuracy of the measured rms mole fraction fluctuations, to determine the integral length scales of the mixture inhomogeneities, and to quantify the cycle-to-cycle fluctuations in bulk mixture composition under well-mixed conditions.
引用
收藏
页码:1714 / 1732
页数:19
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