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首页> 外文期刊>International Journal on Hydropower & Dams >High part-load fluctuations in Francis turbines and the applicability of model test data
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High part-load fluctuations in Francis turbines and the applicability of model test data

机译：弗朗西斯涡轮机的高部分负荷波动和模型测试数据的适用性

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摘要

The Francis turbine, with its fixed blade design, has a very limited guidevane opening range for pressure fluctuation free operation. Beyond this range, fluctuations resulting from non-optimal runner inlet and outlet flow conditions are evident at low guidevane openings (part load) and openings far greater than those for best efficiency (overload). Both low part-load and overload fluctuations have been the subject of much experimental and theoretical investigation in the past and are reasonably well understood. One relatively recent hydraulic phenomenon in fixed blade Francis units has been that of high part-load'fluctuations and associated '80 per cent shocks'. In this paper, the authors explain the phenomenon of high part-load fluctuation, examine specific model test data which exhibit the phenomenon and give guidelines on the likelihood of it appearing in prototype operation.
机译：法兰西斯水轮机采用固定叶片设计，其导叶开度范围非常有限，无法进行压力波动操作。超出此范围，在低导叶开口（部分负荷）和远大于最佳效率（过载）的开口时，明显的流道入口和出口流量状况引起的波动是明显的。过去，低部分负荷波动和过载波动一直是许多实验和理论研究的主题，并且得到了很好的理解。固定式叶片弗朗西斯装置中一种相对较新的水力现象是部分负荷波动大，并伴有“ 80％的冲击”。在本文中，作者解释了部分负载波动大的现象，检查了表现出这种现象的特定模型测试数据，并为在原型操作中出现这种现象的可能性提供了指导。

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