Study on the distribution law of hydraulic characteristic index at the end of the anti-arch section of spillway tunnel
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Abstract:
Dragon-raise-head spillway tunnel is widely used in water conservancy and hydropower projects, due to its complex flow pattern at the anti-arch section the cause of cavitation damage is not clear. To better study this problem, this paper carried out three-dimensional numerical calculations on the working conditions of different spillway tunnels before and after aeration and made exploratory research on the distribution law of the hydraulic characteristics. The results showed that with the increase of drop △Z the velocity of flow in the anti-arch section increased, and the number of cavitation decreased gradually. The change of the radius had a limited influence on the hydraulic parameters of the anti-arch section.. The hydraulic parameters at the end of the anti-arc section did not change much before and after aeration when the drop of △Z increased. With the increase of drop △Z,the velocity of aerated flow at 30m(equal to 15 times the height of the flip bucket) downstream of the end of the anti—arc section decreased visibly, and the number of cavitation increased apparently. The protective effect of aerated flow on the hydrau lic parameters at the downstream part of the cavity was more obvious. Secondary flow occurred at the end of the arc,and sym metrical vortices exist near the sidewalls on both sides. The secondary flow phenomenon associated with the flow in the reverse arc section was a characteristic of the flow in the anti-arch section It not only affected the velocity and pressure distribution near the sidewall but also made the hydraulic characteristics in the anti-arch section more complex.
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