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首页> 外文期刊>Renewable energy >Pressure fluctuations in vaneless space of pump-turbines with large blade lean runners in the S- shaped region
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Pressure fluctuations in vaneless space of pump-turbines with large blade lean runners in the S- shaped region

机译：S形区域大叶片瘦跑器的泵涡轮机的往外空间的压力波动

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摘要

A pumped hydro storage energy station (PHES) is an effective and reliable station which was quickly develop. To obtain better performances, blade leans have been employed recently on pump-turbine runners. To figure out the effect of the blade leans in turbine mode, numerical simulations were performed on two blade-leaned and no-leaned runners in this work. Because blade leans were on high-pressure edges, the vaneless space was paid chiefly attention. Distinctions due to the blade leans can be found in the spanwise direction. Amplitudes of the component of blade passing frequency in pressure fluctuations show nonuniformity at different vertical locations. While in no-leaned runners, the amplitudes are almost the same. It shows close correlations between the pressure fluctuations and blade leans. In addition, this difference was more prominent in the S-shaped region. The conditions were attributed to the different separations at the inlets of runners. Separations located at the pressure side of the blades and developed vortexes located near the hub, the shroud and at the middle span for runners respectively. The vortexes generated low-pressure areas producing a higher fluctuation in the vaneless space with the same frequency of blade passing when they rotated with the runner. (C) 2020 Elsevier Ltd. All rights reserved.
机译：泵送的水力储存能源站（PHES）是一种有效可靠的站，迅速发展。为了获得更好的表现，最近在泵涡轮机跑步者上采用了刀片瘦。要弄清楚刀片倾向于涡轮模式的效果，在这项工作中对两个刀片倾斜和无倾斜的跑步者进行了数值模拟。因为刀片倾斜是高压边缘，所以往来不远的空间主要是关注。由于刀片倾斜的区别可以在枝条方向上找到。压力波动中叶片传递频率分量的幅度显示不同垂直位置的不均匀性。虽然在无倾斜的跑步者中，幅度几乎是相同的。它显示了压力波动和刀片之间的紧密相关性。此外，在S形区域中，这种差异更加突出。条件归因于跑步者的入口处的不同分离。位于叶片的压力侧的分离，并分别开发位于轮毂附近的涡旋，护罩和跑步者的中间跨度。涡旋产生低压区域，在与旋流器旋转时，在瓦拉拉德频率相同的叶片中产生更高的波动。 （c）2020 elestvier有限公司保留所有权利。

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