인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
DBpia AI
AI 에이전트
AI 아이디어
AI 리더
AI 뷰어
Citeasy
크롬 서지관리 다운로드
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
피인용 0
초록·키워드
In order to explore the resonance conditions of the Francis runner due to the rotor-stator interaction between the runner and the guide vane, modal analyses in air or water are required mainly. However, it is substantially challenging to analyze the resonance conditions at a specific nodal diameter using the full model with an arbitrary number of bolt holes and balance holes. Hence, dry/wet mode analyses were performed based on the cyclic symmetry model without a bolt hole and with a balance hole, which is not real. The changes in the natural frequencies of the primary resonance modes due to the shape change were analyzed. In the dry mode, the difference is only within 0.9% at most, but in the wet mode, the difference is up to 6.37%. The absence of a bolt hole increases the stiffness, but a balance hole in each cyclic symmetry model decreases the stiffness. Despite their conflict with each other, the change in the dry mode does not occur significantly. However, in the wet mode, it is judged that the added mass effects are increased by increasing the balance holes more than in reality, which increases the change in natural frequencies compared to the cases of dry modes. Therefore, this change should be compensated for when analyzing the resonance conditions of the wet mode using a cyclic symmetry model with a different number of bolt holes and balance holes.
본문·목차
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