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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 >DESIGN AND DEVELOPMENT OF MODEL TEST FACILITIES FOR PREDICTING SILT DAMAGES
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DESIGN AND DEVELOPMENT OF MODEL TEST FACILITIES FOR PREDICTING SILT DAMAGES

机译：预测损伤的模型测试设施的设计和开发

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摘要

Silt damages in hydro turbines, impellers, pumps and in under water equipment is a very acute problem and leads to huge losses to the hydropower industry. This problem need to be analyzed in greater depth by both the analytical and experimental means to generate necessary data for canying out techno- economic analysis. Different technologies have been used to prevent the damages by various agencies but no permanent solution has come out so far. As a matter of fact, silt content of water can no more be over looked. The shape, a size, density, concentration, friability, hardness and the constituents of silt particles play a very vital role in the extent of damages. These damages can be reduced by experimental studies and by testing of materials in advance under the different plant conditions. But to the best of our knowledge, no where through out the hydro industry any silt impingement erosion testing rig is available for the testing under simulated hydro turbine conditions. The two model test facilities, i.e., (1) Silt impingement erosion and (2) Cavitation-erosion have been designed and fabricated at ERDA under NHPC sponsored R&D projects. These model rigs simulate the hydro turbine conditions such as silt concentration, pressure impingement angle, velocity, sample size and silt particles etc. In this paper, the detailed description of design and development, various parameters that can be controlled and mechanism of damages under simulated conditions of water turbine are discussed. By using these model test rigs, the loss of material due to silt damages can be predicted in advance. This facility also will be useful to develop appropriate materials for the hydro turbine, impellers and coatings for blades to give improved performance and longer life.
机译：水轮机，叶轮，泵和水下设备中的淤泥损坏是一个非常严重的问题，并给水力发电行业造成巨大损失。需要通过分析和实验手段对这一问题进行更深入的分析，以生成进行技术经济分析所需的数据。各种机构已采用了不同的技术来防止损害，但是到目前为止还没有永久性的解决方案。事实上，水的泥沙含量再也无法忽略。泥沙颗粒的形状，大小，密度，浓度，易碎性，硬度和成分在破坏程度中起着至关重要的作用。这些损害可以通过实验研究和在不同工厂条件下预先测试材料来降低。但是据我们所知，在整个水利行业中，没有任何淤泥冲蚀试验台可用于在模拟水轮机条件下进行试验。在NHPC赞助的研发项目下，这两个模型测试设施，即（1）淤泥冲刷侵蚀和（2）气蚀侵蚀已在ERDA设计和制造。这些模型钻机模拟了水轮机的工况，例如淤泥浓度，压力冲击角，速度，样本大小和淤泥颗粒等。本文详细介绍了设计和开发，可控制的各种参数以及模拟过程中的破坏机理讨论了水轮机的条件。通过使用这些模型测试台，可以预先预测由于淤泥破坏而造成的材料损失。该设施还可用于开发适用于水轮机，叶轮和叶片涂层的材料，以提高性能并延长使用寿命。

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