平板闸门门槽内的水流流态十分复杂，容易因空化空蚀而破坏门槽。以卡基娃水电站放空洞工程为实例,采用水工模型试验探讨门槽附近水流流态、压力、空化数的变化规律。研究结果表明：有压式门后连接段能较好地改善门槽及门后连接段水流的流态；闸门全开时，各个区域没有负压出现，水流发生空化的可能性也较低；闸门局开时，门槽及门后连接段会出现负压，最大负压出现在门槽的底板处，水流发生空化的可能性也较大；水流的脉动表现出明显振幅大、频率低的强紊流脉动压力的特点。研究成果对于高水头深孔闸门门槽的设计具有一定的借鉴意义。

Flow regime in the bulkhead gate slot is very complex and the slot is easily damaged because of flow cavitation. We investigated the variation regularity of flow regime, pressure, and cavitation number of the segment near the gate slot through hydraulic model test. The emptying tunnel of Kajiwa Hydropower Station was taken as a case study. Results showed that pressure-flow segment behind the gate could improve the flow regime. When the gate was fully open, no negative pressure appeared in each area, and the possibility of water cavitation was rather low. When the gate was partially open, negative pressure was found in the gate slot and the segment behind the gate, with peak negative pressure on the floor of the gate slot, and high possibility of water cavitation. The water fluctuation was featured by large amplitude and low frequency, which was the characteristics of strong turbulent flow. The results could provide reference for the slot design of high-head deep-hole bulkhead gate.