직경비 크기가 평판 오리피스 유량계 주위의 유동 형태에 미치는 영향에 관한 수치적 연구

다국어 초록 (Multilingual Abstract)

At present, domestic nuclear power plants are carrying out In-Service Test (IST) to check safety functions of safety-related pumps and monitor/evaluate the degree of vulnerability over time during reactor operation. When performing this pump IST, it is necessary to measure the differential pressure at the test flow rate indicated on the differential pressure type flowmeter, and check whether the corresponding differential pressure magnitude meets the acceptance criteria. Therefore, it is necessary to confirm whether a differential pressure type flowmeter, such as a flat orifice flowmeter, indicates the correct flow rate under wide operating conditions. In addition, depending on the ratio of pipe diameter to orifice hole diameter, the flow pattern around an orifice flowmeter may be changed, and measurement uncertainty for flow rate or pressure loss magnitude may be affected. Therefore, the selection of proper diameter ratio is essential for the orifice flowmeter design. In this study, the effect of diameter ratio magnitudes (0.5 and 0.75) on the flow pattern around a flat orifice flowmeter was investigated by using the commercial computational fluid dynamics software ANSYS CFX R18.1.

참고문헌 (Reference)

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