Minimum submergence before double-entrance pressure intakes

Citation
Jm. Ma et al., Minimum submergence before double-entrance pressure intakes, J HYDR ENG, 126(8), 2000, pp. 628-631
Citations number
5
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
JOURNAL OF HYDRAULIC ENGINEERING-ASCE
ISSN journal
0733-9429 → ACNP
Volume
126
Issue
8
Year of publication
2000
Pages
628 - 631
Database
ISI
SICI code
0733-9429(200008)126:8<628:MSBDPI>2.0.ZU;2-4
Abstract
This paper describes a large-scale physical model study concerning the mini mum submergence required for double-entrance pressure intakes, such as used for power tunnel intakes. Use of minimum submergence can avert the occurre nce of subatmospheric pressure and air-entraining vortices, and avoid reduc ing the efficiency of the turbine and its vibration of the turbine, etc. Th e scale of the double-entrance intake model, 1:30, which is primarily desig ned for the Three Gorges project, is almost the largest in the world. Based on analysis of the experimental data, an empirical formula is obtained and then it is compared with Gordon's formula, which is used mainly to calcula te the minimum submergence before single-entrance intakes. The empirical fo rmula is useful in the design of double-entrance pressure intakes.