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학술대회자료
저자정보
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한국자동차공학회 한국자동차공학회 춘 추계 학술대회 논문집 한국자동차공학회 1996년 춘계학술대회논문집 2호
발행연도
1996.6
수록면
262 - 267 (6page)

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To quantify the LII signals from soot particle in flames and Diesel engine cylinder, a new method has been proposed for correcting LII signal attenuated by soot particles between the measuring point and the detector and verified by an experiment on a laminar jet ethylene-air diffusion flame. Being proportional to the attenuation, the ratio of LII signal at two different detection wavelengths can be used to correct the measured LII signal and obtain the unattenuated LII signal, from which the soot volume fraction in the flame can be estimated. Both the 1064-nm and frequency-doubled 532-nm beams from the Nd: YAG laser are used. Single-shot, one-dimensional (1-0) line images are recorded on the intensified CCD camera, with the rectangular-profile laser beam using I-mm-diameter pinhole. Two broadband optical interference filters having the center wavelengths of 647 nm and 400 nm respectively and a bandwidth of 10 nm are used. This two-wavelength correction has been applied to the ethylene-air coannular laminar diffusion flame, previously studied on soot formation by the laser extinction method in this laboratory. The results by the LII measurement technique and the conventional laser extinction method at the height of 40 mm above the jet exit agreed well with each other except around outside of the peaks of soot concentration, where the soot concentration was relatively high and resulting attenuation of the LII signal was large. The radial profile shape of soot concentration was not changed a lot, but the absolute value of the soot volume fraction around outside edge changed from 4 ppm to 6.5 ppm at r=2.8 mm after correction. This means that the attenuation of LII signal was approximately 40% at this point, which is higher than the average attenuation rate of this flame, 10 - 15 %.

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ABSTRACT

1.서론

2.이론적 배경

3.실험 장치 및 방법

4.실험 결과

5.결론

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