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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Study of rotary and diffused flow in spillway tunnel with blocking-diffuser
Study of rotary and diffused flow in spillway tunnel with blocking-diffuser
Author : NIU Zhengming, SUN Jing, LI Qilong, HOU Yanping
Abstract: The rotary-flow spillway tunnel with blocking-diffuser was proposed for meeting the requirement of
energy dissipation in high dam. Then the hydraulic characteristics of rotary and diffused flow in tunnel were
analyzed by model test and numerical simulation. The results showed that the flow in rotary-flow section was
rotational with cavity and high wall pressure, which transformed to air-water mixture with high turbulent and
negative pressure after the diffuser. The velocity of rotary flow could be kept down below 30 m/s. Over radial
direction, the tangential velocity was anti-symmetric suggesting a combined eddy, and the axial velocity was
symmetrical, but the radial velocity was low. Even on the condition of submerged outlet, the good air
ventilation and exhale were obtained. Cavitaion erosion did not occur in rotary-flow section, and sufficient
water-air bleeding could reduce the possibility of cavitation with negative pressure after the diffuser. Because
of the cavitation resistance and high energy dissipation, the rotary-flow spillway tunnel with the
blocking-diffuser has a good application prospect for discharge and dissipation in high dam
File Size : 2,737,977 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 28/08/2015
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