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以苏家河口水电工程为例,针对其陡坡溢洪道掺气坎对流量大小适应性较差的问题进行了试验,对#2掺气坎3种体型(1∶4、1∶10、1∶15)进行了挑角的优化设计。结果表明,在陡坡溢洪道设置掺气坎时应保证挑角和坎高与单宽流量相互匹配,即挑角在3°～5°之间的空腔长度能满足各种工况,否则可能出现掺气坎适应性很差的问题,不利于工程泄洪时的正常和安全运行;空腔长度与挑角在小流量情况下呈指数关系,在大流量情况下呈对数关系,这为实际工程设计提供了依据。
Taking the Sujiahekou hydropower project as an example, the adaptability of the flow rate of the spillway with steep slope spillway was tested. The effects of # 2 aeration level on the three body types (1: 4, 1:10, 1:15 ) Carried out the optimal design of pick angle. The results show that when the aeration ridge is set up on the steep slope spillway, the matching of the pick angle and the ridge height with the single-wide flow should be ensured. That is, the cavity length with the pick angle between 3 ° and 5 ° can meet various working conditions, otherwise it may occur The problem of poor adaptability of aeration is not conducive to the normal and safe operation when the project discharges. The length of the cavity and the angle of pick are exponential in the case of small flow and logarithm in the case of large flow, which is the actual project Design provides the basis.