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| Impact of first step table-board angle on hydraulic characteristics of combined dissipater |
| ZHANG Qin, YANG Jurui* |
| Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China |
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Abstract In order to optimize the aeration characteristics of stepped spillway under the large flow rate per unit width, based on the spillway of Ahai hydropower station, different table-board angles of first step, respectively up 5°, 10°, 15°, falling down 5°, 10°, 15° and flat surface 0°, were set on the Y-shaped flaring gate piers combined with stepped spillway and stilling basin by the physical model at the ratio of 1/60, to find that the optimal level of table size can improve the aerosol characteristics by the cavity length, the power flow at the stilling basin bottom, time-averaged pressure on stilling bottom, temporary bottom velocity, energy dissipation ratios and other aspects. The results showed that the length of the aeration cavity increases with the increase of the first stage table angle; the cavity negative pressure decreases with the increase of the first stage table angle, and with the increase of the first stage table angle, the maximum cavity negative pressure transfers from the second step facade to the first step facade; the energy consumption rate increases slightly with the increase of the first stage table angle and the energy dissipation effect when the first step is up is better than that when the first step is falling down or at the level. The first step on the surface pick 15° is the interim step joining type of the best aerosols.
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Received: 14 November 2017
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