Analysis of flow characteristics in pumped storage unit during start-up in turbine mode

Analysis of flow characteristics in pumped storage unit during start-up in turbine mode
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抽水蓄能机组水轮机启动时流量特性分析

DOI:
10.1088/1742-6596/1985/1/012051
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发表时间:
2021
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
Zhengwei Wang
Zhengwei Wang
中科院分区:
其他
文献类型:
--
作者:
Tao Liu;Chao Wang;Zhiming Chen;Funan Chen;Huili Bi;Yongyao Luo;Zhengwei Wang

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抽象的。启动时,机组由静止状态进入空载转速。转轮内充满复杂的涡流,阻碍水流进入转轮,甚至导致启动失败。有必要研究涡流状态来评估启动的稳定性。本文采用一维管道系统与机组内部三维流动耦合的方法,模拟启动过程,分析转轮内三维流动状态。通过分析压力分布、流线和湍流动能,深入研究了启动过程中的流动不稳定性。结果表明,随着流量的增加,转轮内紊流强度减小。启动时,转轮内的涡流占据整个叶片通道,然后消失。随着流量的减少,转轮入口处的湍流动能升高,转轮入口处出现小涡流。
Abstract. During the start-up, the unit enters into speed-no-load from static state. The runner is full of complex vortex, which hinders the water flow into the runner, and even leads to the failure of starting up. It is necessary to study the vortex and flow state to evaluate the stability of start-up. In this paper, the coupling method of one-dimensional pipeline system and three-dimensional flow inside the unit is used to simulate the startup process and analyse the three-dimensional flow state in runner. The flow instability during the start-up process is deeply studied by analysing the pressure distribution, streamline and turbulent kinetic energy. The results show that the turbulence intensity in the runner decreases with the increase of discharge. During start-up, the vortices in the runner occupy the whole blade passage, and then disappear. With the decrease of discharge, the turbulent kinetic energy at the runner inlet rises and small vortex appears at runner inlet.
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发表时间: 2020-10
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