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CFD에 의한 수직형 정수처리 실증시설 내 압력식 오존접촉조 성능개선에 관한 연구
최종웅,김성수,김정현,김관엽 대한상하수도학회 2014 상하수도학회지 Vol.28 No.4
The ozonation process has been widely used for drinking water disinfection around the world. Recently, the pressurized ozone contactor, in which the side stream typed ozone injection method is installed, has been applied to water treatment system. In this study, numerical calculations were conducted to compare prototype and screw-type ozone contactors based on hydraulic effectiveness in more details. The prototype ozone contactor was already installed and operated in domestic water treatment plant, and the screw-type is the suggested one for improving ozone contact efficiency installing the screw plate to the prototype. Screw turn numbers of screw plate were changed as 3, 5, 7 and 9, respectively for numerical simulation. The CT(concentration of disinfectant in mg/L times time in minutes) value was considered as one of the options for evaluating disinfection ability. From the results, it could be concluded that the performance of the screw-type is higher than that of the protype contactor by controlling the variable T as the tracer time. Also, Morill index of the screw-type(turn numbers = 5 ) appeared to be lower than the other.
수력플랜트 모델수차 성능시험을 위한 시험설비 적절성에 관한 연구
최종웅,조용덕,홍성택,조현식,차상훈 한국유체기계학회 2019 한국유체기계학회 논문집 Vol.22 No.2
Performance evaluation of model turbines in the development of a hydropower plant is critical for determining hydraulic performance. Generally, performance evaluation of a model turbine is performed in accordance with the criteria outlined in IEC 60193, and a facility meeting these criteria is required. However, even with the construction of a facility for testing model turbine performance, a suitable facility for performance evaluation is required. To ensure the reliability of the performance evaluation of the model turbine, the uncertainty of the test is evaluated. For advanced institutes, it is recommended that the total uncertainty be less than 0.25%. Herein, the total uncertainty according to the model turbine performance test was calculated to determine the suitability of the equipment for evaluating model turbine performance. The results of the test performed by an external organization were compared with the results of this study. The results indicated that the total uncertainty was less than 0.25%. The error range of the model turbine test results obtained by the external augmentation system and the results obtained by the turbine test equipment of the vertical axis and the horizontal axis was less than 0.5%. The adequacy of the model turbine performance test facility was thus demonstrated.