Abstract：The research theories for setting up an aerator in front of the stepped spillway to improve the dam surface erosion reduction capacity and the dam energy dissipation rate are still immature. Nine types of aerated concrete for hydraulic model tests, were adopted and the variance analysis and range analysis method was used to obtain the significant influence of the different heights and angles aerated on the hydraulic characteristics of the stepped spillway. The experimental results show that: Compared with the height aerated, the angle has a great influence on the maximum negative pressure on the step surface. When the angle of aerator is 11.3°, the height of aerator is 1.0 m or 1.3 m, the maximum ne-gative pressure on the step surface is minimum, which is -9.25 kPa or -8.56 kPa respectively. Compared with the height aerated, the angle of aerator has a significant influence on the maximum time average pressure in the anti-arc section, but the effect of the different heights and angles on the minimum time average pressure in the stilling pool is similar. When the angle of aerator is 11.3°, the height is 0.7 m or 1.0 m, the upstream water flow has a lower scouring strength to the downstream floor, the water body is aerated sufficiently, and the maximum time average pressure in the anti-arc section is 424.44 kPa or 431.73 kPa respectively. For the energy dissipation effect of the dam, the height of aerator is the main factor affecting the energy dissipation rate of the stepped spillway. According to the comprehensive analysis of various factors, it is recommended that the angle of aerator of 11.3° and the height of 1.0 m be the optimum aerator type, with an energy dissipation rate of 53.63%.
郭莹莹,杨具瑞*,任中成,汤建青. 高水头阶梯溢流坝掺气坎体型优化试验研究[J]. 排灌机械工程学报, 2020, 38(2): 152-156.
GUO Yingying,YANG Jurui*,REN Zhongcheng,TANG Jianqin. Experimental study on shape optimization of aerator of stepped spillway with high head. Journal of Drainage and Irrigation Machinery Engin, 2020, 38(2): 152-156.
