某水电站深孔泄洪洞流态及泄洪试验研究

Study of flow pattern and flood discharge test of deep-hole flood discharge tunnel for a hydropower station

为进一步了解某水电站扩机深孔泄洪洞改建工程中存在的问题,通过水工模型试验,开展上游进气、流态、泄流能力等问题的研究,得出库水位在死水位~校核水位范围内,下游工作弧门全开时,工作闸室成为了进气通道,是导致洞内流态恶化的主要原因。为确保洞内形成有压水流结构,以及汛期度汛安全,下游弧门需局部开启控泄,同时得出上游水位与下游弧门开度、泄量之间的对应关系,研究成果可为工程汛期运行提供参考。

In order to further understand the problems existing in the alteration work of the deep-hole flood discharge tunnel of a hydropower station,hydraulic model test was conducted to study the upstream intake flow pattern and flood discharge capacity.It is concluded that the reservoir water level is between the dead water level and check water level;and the working gate chamber becomes the air intake channel when the downstream working arc gate is fully open,which is the major cause for the deterioration of flow pattern in the tunnel.In order to ensure the structure of pressurized water flow in the tunnel and the safety of flood season,the downstream arc gate needs to be controlled at partial opening.The relationship between the upstream water level and the downstream arc gate opening and discharging is obtained.The result of study is able to provide reference for the operation of project in flood season.