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논문 기본 정보

자료유형
학술대회자료
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저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2008년도 열공학부문/유체공학부문 춘계학술대회 논문집
발행연도
2008.4
수록면
478 - 481 (4page)

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The lateral crossflow on subchannels in a rod bundle array was investigated to understand the flow characteristics related to the mixing vane types on a spacer grid by using the PIV technique. For more measurement resolutions, a 5×5 rod bundle was fabricated a 2.6 times larger than the real rod bundle size in a pressurized water reactor. A rod-embedded optic array was specially designed and used for the illumination of the inner subchannels. The crossflow field in a subchannel was characterized by the type and the arrangement of the mixing vanes. At a near downstream location from the spacer grid (z/D<SUB>h</SUB>, = 1) in the case of the split type, a couple of small vortices were generated diagonally in a subchannel. On the other hand, in the case of the swirl type, there was a large elliptic vortex generated in the center of a subchannel. The measurement results were compared with the experimental results which had been performed with the LDV technique at the same test facility. The magnitudes of the flow velocity and the vorticity in PIY results were less than those in LDV measurement results. It was shown that the instantaneous flow fields in a subchannel frequently have quite different shapes from the averaged one.

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Abstract
1. 서론
2. 실험장치 구성
3. 실험결과 및 분석
4. 결론
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