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.
논문 기본 정보
- 저자정보
피인용 0
초록·키워드
Hydraulic efficiency is a crucial parameter in estimating the performance of hydraulic turbines. However, the flow rate makes such estimation challenging. Several methods have been developed over the years to measure the flow rate. The pressure-time method is an accurate and inexpensive alternative for flow rate estimation, based on transforming momentum into pressure during the deceleration of a liquid mass. The flow rate is obtained by integrating the differential pressure and the pressure loss history between two cross-sections. In the present work, three-dimensional (3D) computational fluid dynamics (CFD) analyses are performed to investigate in detail the influence of the head loss due to friction over the method accuracy when applied in developing flows. One important novelty of the CFD analyses is the use of the immersed solid method for the valve movement modeling for studying the pressure-time method, which is less expensive and more stable than the dynamic mesh method applied in previous CFD studies. The losses are investigated with the assumptions of constant, quasi-steady and unsteady friction factors and compared with detailed data obtained from CFD simulation. The calculated flow rate is not found to be precisely related to the initial pressure drop based on quasi-steady and unsteady friction factors in developing flows. Therefore, a friction factor correction coefficient is proposed and implemented, decreasing the error. The numerical results are validated with experimental data and compared with the dynamic mesh method.
본문·목차
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
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