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Study of Sediment Erosion in Guide Vanes of Francis Turbine - Studier av sedimenter erosjon i ledeskovler av Francis turbin

机译：弗朗西斯涡轮导向叶片的泥沙侵蚀研究-弗朗西斯涡轮导向叶片的泥沙侵蚀研究。

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Sediment erosion wear of Francis turbines is a big problem for power plants near the Himalayas and the Andes Mountains. The turbine components must be maintained often, resulting in reduction of power production and high maintenance cost.To understand the erosion problem better it is of high interest to study the flow around the guide vanes of a Francis turbine. A test rig which will give the opportunity to study this flow is being designed, and will be used for experimental test at the Turbine Testing Lab at Kathmandu University and it is called 3 GV Cascade. The test section of the test rig has geometry similar to the guide vane cascade of the Francis turbines at Jhimruk Power Plant in Nepal. A similar test rig 1 GV Cascade is being installed at the Waterpower Laboratory at NTNU the spring of 2015.The purpose of this thesis has been to describe the test rig and create procedures for everything from following up the production of the rig to successful measurements with a special focus on safety. Particle Image Velocimetry is going to be used for the velocity measurements and to visualize the flow in the cascade. Procedures for leakage- and pressure testing and operation of 3 GV Cascade at TTL are based on procedures at the Waterpower Laboratory. PIV setup, optimization and measurement procedures are based on theory and writer s own experience from doing PIV measurements on the Swirl rig at the Waterpower laboratory. Simple bending stress analyses were performed to make sure that the test rig will be able to withstand a pressure of 10 bar.Theory about PIV and optimization rules has been given with the intention that it will be helpful when PIV setup and measurements on 3 GV Cascade is going to be performed. Procedures for PIV setup on the Swirl rig have also been included, since it has been planned to use that rig as a PIV training facility at the Waterpower Laboratory.
机译：对于喜马拉雅山和安第斯山脉附近的发电厂，弗朗西斯涡轮机的泥沙侵蚀磨损是一个大问题。涡轮机部件必须经常维护，从而导致发电量减少和维护成本高昂。要更好地了解腐蚀问题，研究弗朗西斯涡轮机导叶周围的流动非常重要。正在设计一种将提供机会研究这种流动的试验台，并将在加德满都大学的涡轮测试实验室进行实验测试，称为3 GV级联。测试台的测试部分的几何形状类似于尼泊尔希姆鲁克电厂的弗朗西斯涡轮机的导叶叶栅。类似的试验台1 GV Cascade已于2015年春季在NTNU的水电实验室安装。本论文的目的是描述该试验台，并为从后续生产到成功进行测量的所有过程创建程序特别注重安全性。粒子图像测速仪将用于速度测量并可视化级联中的流动。用于TTL的3 GV级联的泄漏和压力测试以及操作的程序均基于水电实验室的程序。 PIV的设置，优化和测量程序基于理论和作者在水力实验室在旋流钻机上进行PIV测量的经验。通过简单的弯曲应力分析来确保测试设备能够承受10 bar的压力。已经给出了有关PIV的理论和优化规则，旨在对在3 GV级联上进行PIV设置和测量提供帮助将要执行。还包括在旋流钻机上进行PIV设置的程序，因为已计划将其用作水电实验室的PIV培训设施。

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    Haugvaldstad Linda;

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  • 年度 2015
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