메뉴 건너뛰기
소속 기관 / 학교 인증
인증하면 논문, 학술자료 등을  무료로 열람할 수 있어요.
한국대학교, 누리자동차, 시립도서관 등 나의 기관을 확인해보세요
(국내 대학 90% 이상 구독 중)
고객센터 ENG
주제분류

논문 기본 정보

저자정보
(과학기술연합대학원대학교) (한국생산기술연구원) (과학기술연합대학원대학교) (한국수력원자력) (금성이앤씨) (과학기술연합대학원대학교)
저널정보
한국유체기계학회 한국유체기계학회 논문집 한국유체기계학회 논문집 제22권 제5호(통권 제116호)
오류 신고하기

피인용 2

검색

    초록·키워드

    The precessional vortex is usually developed in the draft tube during the operations at the turbine mode of a pump turbine with low flow-rate conditions as the off-design conditions. This vortex causes pressure fluctuation and instability for the operation of the pump turbine system, which results in system failure. The development of the precessional vortex is related to the strength of the swirl at the runner outlet with low flow-rate conditions. In this study, the definition of the swirl number was used to investigate the influence of the swirl intensity on the precessional vortex characteristic at the draft tube. Accordingly, three-dimensional steady- and unsteady-state Reynolds-averaged Navier-Stokes calculations were performed with a shear stress transport turbulence model and a two-phase flow analysis to observe the internal flow and unsteady pressure characteristics according to the precessional vortex. The precessional vortex was well captured in the draft tube cone within the specific range of swirl numbers. This vortex region showed the complicated internal flow and affected the higher unsteady pressure characteristics on the wall of the draft tube cone.

    최근 본 자료 전체보기