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针对两台机组共用的尾水调压室进行了水力特性试验，研究了尾水调压室流量比、阻抗孔口中水流方向及孔口形状对尾水调压室水头损失系数的影响．试验结果表明，阻抗式尾水调压室的水头损失系数并不是现有文献所描述的那种仅与孔口形状和水流方向有关的常数，而是一个与流量比有关的变量．文中给出了不同阻抗孔口的调压室水头损失系数关于流量比的最小二乘拟合公式
The hydraulic characteristics of the tailrace surge tank shared by two units were tested. The effects of flow ratio of tailrace surge tank, flow direction of impedance orifice and shape of orifice on head loss coefficient of tailrace surge tank were studied. The experimental results show that the head loss coefficient of the impedance tailrace surge tank is not a constant that is only related to the shape of the orifice and the direction of the flow of water as described in the prior literature but is a variable related to the flow ratio. In this paper, we give the least square fitting formula of the head loss coefficient of surge chamber with different impedance orifice