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Numerical modelling of water subsurface reservoirs during the operation phase in underground pumped storage hydropower plants

机译：地下抽水蓄能电站运行期地下水库数值模拟。

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Underground pumped storage hydropower (UPSH) plants may be an alternative to store subsurface energy with lower environmental impacts than conventional pumped storage hydropower (PSH) plants. Network of tunnels in closed mines (i.e. coal mines) could be used as water lower reservoir of UPSH plants. The amount of storable energy depends on the water mass and the net head between upper and lower reservoirs. Depending on the direction of the water flow rate, pumping or turbine modes may be used to produce or consume electrical energy. Filling and emptying processes during the operation stage in the underground reservoir are complicated due to the presence of two fluids (water and air) interacting inside the network of tunnels. This paper explores the underground reservoir during the operation stage considering a water flow rate of 55 m~(3)s~(-1). Two-phase three dimensional CFD numerical models using Ansys Fluent have been developed in order to know the behaviour of the air flow on tunnels and ventilation shaft. Static pressure and air velocity have been analyzed in the simulations at the exit of the ventilation shaft as well as the junction zone between the ventilation shaft and the tunnels network. The results obtained show that a static pressure up to 8,600 Pa and air velocities up to 80 m s~(-1)could be reached in turbine mode considering a vent shaft with 1 m in diameter. The static pressure increases up to 258,000 Pa if a ventilation shaft of 0.5 m in diameter is considered.
机译：与传统的抽水蓄能水电（PSH）电厂相比，地下抽水蓄能水电（UPSH）电厂可以替代对地下能量进行存储的环境。封闭矿井（即煤矿）中的隧道网络可以用作UPSH工厂的水位较低的水库。可存储的能量取决于水量和上下水库之间的净水头。取决于水流​​方向，可以使用泵送模式或涡轮模式来产生或消耗电能。由于在隧道网络内部相互作用的两种流体（水和空气）的存在，地下水库运营阶段的填充和排空过程非常复杂。本文以55 m〜（3）s〜（-1）的水流量在作业阶段对地下油藏进行了勘探。为了了解隧道和通风井上气流的行为，已开发了使用Ansys Fluent的两相三维CFD数值模型。在模拟中分析了通风竖井出口处以及通风竖井与隧道网络之间的交界区域的静压力和空气速度。获得的结果表明，考虑到排气轴的直径为1 m，在涡轮机模式下可以达到8600 Pa的静压和80 m s〜（-1）的风速。如果考虑使用直径为0.5 m的通风井，静压将增加至258,000 Pa。

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