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首页> 外文会议>2nd International Conference on Silting Problems in Hydropower Plants Sep 26-28, 2001 Bangkok, Thailand >CAVITATION EROSION CHARACTERISTICS FOR BELL-MOUTHS OF PRESSURE SPILLWAYS
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CAVITATION EROSION CHARACTERISTICS FOR BELL-MOUTHS OF PRESSURE SPILLWAYS

机译：压力溢洪道的空蚀特征

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摘要

For intensive development of hydropower potential in the south Asian countries construction of the high head hydropower stations with peaking capacity is must. Spillway structures of such hydropower stations are forced to function in hydraidically heavy conditions with flow velocities of 40 to 50 m/sec and more. The irregularities appearing in the process of construction technology, with high flow velocities, seem to be the sources of occurring cavitation and cavitation erosion on the surface of spillway structures. The bell-mouths of the pressure spillways of 'Vratsky', 'Voljhsky' hydropower stations of Russia and 'Madden' hydropower station of USA experienced cavitation erosion with flow velocity of more than 25 m/sec. Various cases of erosion due to cavitation exist in practice of exploitation of the spillway structures which is oftenly not allowed taking into account that their inspection and maintenance are very difficult and practically not possible, if the special expensive measures are not considered. Therefore, some cavitation erosion characteristics for the bell-mouths of pressure spillway structures are presented herein for their rational hydraulic design of the high head hydropower stations.
机译：为了在南亚国家集中开发水电潜力，必须建设具有峰值容量的高水头水电站。这种水力发电站的溢洪道结构被迫在水力大的条件下发挥作用，流速达到40至50 m / sec或更高。在施工技术过程中出现的不规则现象，具有很高的流速，似乎是溢洪道结构表面发生空化和空化侵蚀的根源。俄罗斯“ Vratsky”，“ Voljhsky”水力发电站和美国“ Madden”水力发电站的压力溢洪道的钟形口经历了空化侵蚀，流速超过25 m / sec。在开发溢洪道结构的实践中，存在各种因气蚀引起的侵蚀的情况，如果不考虑采取特殊的昂贵措施，则由于检查和维护非常困难并且实际上是不可能的，因此通常是不允许这样做的。因此，本文针对高压溢洪道水口的合理水力设计，提出了压力溢洪道结构钟形口的一些气蚀特性。

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