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논문 기본 정보

자료유형
학술저널
저자정보
박찬준 (서울과학기술대학교) 성재용 (서울과학기술대학교) 엄인용 (서울과학기술대학교)
저널정보
한국자동차공학회 한국자동차공학회논문집 한국자동차공학회논문집 제24권 제2호
발행연도
2016.3
수록면
169 - 182 (14page)

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초록· 키워드

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This paper is the third investigation on the evaluation methods of flow characteristics in a steady flow bench. In the previous works, several assumptions used in the steady flow bench were examined and the flow characteristics were estimated both by the conventional impulse swirl meter and a particle image velocimetry at 1.75B position. From these works, it was concluded that the assumption of the solid rotation might cause serious problems and both of the eccentricity and the velocity profile distort the flow characteristics when using the ISM at 1.75B plane. Therefore, the understanding of the detail velocity profiles is very important to keep discussing the issues about the steady flow evaluation method. For this purpose, the planar velocity profiles were measure at 1.75B position by particle image velocimetry and the characteristics were examined according to the valve angles and lifts. The results show that the planar velocity profiles of 11, 16, 21° valve angle heads according to the lift are similar to each other, however, that of 26° angle is an exceptional case in the all aspects. In addition, the swirl behaviors are not apparent up to 6~8 mm lift under the 21° angle and somewhat arranged motions are observed over the whole plane near the highest lift. At this point, the narrower the angle, the lower the lift at which the swirl motions become clear. On the other hands, when the angle is 26°, the center of swirl is always farthest from the cylinder center and only the indistinct swirl is observed even if at the highest lift. Also, all the swirl centers are quite apart from the cylinder center so that the effect of eccentricity may not be negligible at 1.75B regardless the valve angle. Related to the tangential velocity along with the radial direction, the bands of the velocity distribution are very wide and the mean velocities of cylinder center basis are lower than the velocity which is assumed in the ISM evaluation. Lastly, the mean tangential velocity profiles of swirl center basis are sometimes higher than that of ISM-assumed up to 0.6 non-dimensional distance less than 6mm lift, however, as the lift increases the profiles are different according to the angles and profile 11° is the most closed to the ideal profile. Consequently, the real velocity profile is far from the assumption of ISM evaluation.

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Abstract
1. 서론
2. 실험 장치 및 방법
3. 수평면 유동 특성
4. 반경 방향을 따른 속도분포
5. 결론
References

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UCI(KEPA) : I410-ECN-0101-2016-556-002674699