通过模型试验对旋流阻塞复合式泄洪洞的压力、旋流角和空腔直径等水力特性进行了研究。设置阻塞后，起旋器与阻塞之间的水平洞段正压力明显增加与均化，沿程压力变化减小；由于离心力与旋流的作用，阻塞出口之后是完全掺混的水气两相流，阻塞后流速降低，空化的可能性减小，旋流洞段的范围极大地缩短；空腔直径减小，通风量需求减小。因此可利用水平旋流内消能泄洪洞的阻塞效应，进一步改善导流洞改建时的结构设计与防护措施。

Through the model test ,this paper investigates the hydraulic characteristics of the swirl tunnel containing a barrage, which include pressure, rotational flow angle, swirl cavity pocket diameter, and so on. After the barrage is installed, the positive pressure of the level section in the hole between the fastening device and the barrage is increased obviously, the change of pressure along length is reduced; with the action of centrifugal force, there exists twophase flow which is mixed enough by air and water behind the barrage outlet，the velocity is reduced, the cavitation probability grows downwards, and the range of the swirl tunnell is decreased; with the decrease of swirl cavity pocket diameter, the ventilating amount will be less. Except for the lowerof the discharging capacity, the barrage effect in the level rotary internal energy dissipation discharge tunnel is benefit to the project, therefore, we can make use of it to improve the structural design and preventive measure when the diversion tunnel will be rebuilt.