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자료유형
학술저널
저자정보
저널정보
한국마린엔지니어링학회 Journal of Advanced Marine Engineering and Technology (JAMET) 한국박용기관학회지 제27권 6호
발행연도
2003.9
수록면
797 - 805 (9page)

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This paper describes experimental investigations of helium-air exchange flow through single opening and partitioned opening. Such exchange flows may occur following rupture accident of stand pipe in high temperature gas cooled reactor. A test vessel with a small opening on top of test cylinder is used for experiments. An extimation method of mass increment is developed and applied to measure the exchange flow rate. An technique of flow visualization by match-zehnder interferometer is provided to recognize the exchange flows. Flow measurements are made with the opening, for partition ratins Hp/Hi in the range 0 to 1, where Hp and Hi are partition length and height of the opening, repectively. In the case of Hp/Hi of 0, flow passages of upward flow of the helium and downward flow of the air within the opening are unseparated(bidirectional) and the two flows interfere within the opening. The unseparated flow increases strength of flow resistance and therefore the exchange flow rate is minimum through range of the partition rations. Two flow zones, i.e., separated(unidirectional) flow zone and unseparated(bidirectional) flow zone, exist with increasing the partition length. The exchange flow rate increases with increasing the separated flow zone. It is found that a maximum exchange flow rate exists at Hp/Hi of 1. As a result of comparison of the exchange flow rates by changing the partition ratio, the fluids Interference in the unseparated zone is found to be an important factor on the helium-air exchange flow rate.

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