Experimental investigation of vortex rope mitigation in a 10 MW axial turbine

IF 9 1区 工程技术 Q1 ENERGY & FUELS
L.R. Joel Sundstrom , Shahab Shiraghaee , Pontus P. Jonsson , Michel J. Cervantes
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引用次数: 0

Abstract

Increased utilization of hydraulic turbines as a regulatory tool for electrical grid stabilization forces some turbines to operate away from their design point, thus increasing wear and tear. In here, rotating vortex rope (RVR) mitigation by means of radial insertion of cylindrical rods in the draft tube is investigated experimentally on a 10 MW Kaplan turbine operating as a propeller. Pressure measurements in the draft tube, runner chamber and spiral casing, along with strain and acceleration measurements on the turbine shaft are performed to scrutinize the effectiveness of the mitigation system. Three part-load operating points are investigated, corresponding to 83%, 72%, and 68% of the guide vane servo stroke relative to the best-efficiency point opening. It is shown that the mitigation system dampens the harmful effects of the vortex rope at all operating points, especially at lower part-load conditions. Specifically, the pressure amplitude of the RVR fundamental mode inside the runner chamber reduces by 84%, 63%, and 73% at the three investigated operating points, relative to the amplitudes without mitigation. On the turbine shaft, the fundamental mode of the axial thrust oscillations at the RVR frequency reduces by 65%, 83%, and 95%. It is shown that the mitigation does not come with a high cost on the turbine time-averaged efficiency over the course of the measurements, the penalty being 2%, 2.5%, and 3.2% at the protrusion length where optimal mitigation is achieved at each operating point. For high-head machines, the penalty is expected to be lower since the relative importance of the draft tube diminishes for higher heads.
10mw轴流涡轮涡绳抑制试验研究
水力涡轮机作为电网稳定的调节工具,其利用率的提高迫使一些涡轮机远离其设计点运行,从而增加了磨损。在一台作为螺旋桨运行的10mw Kaplan涡轮上,通过在尾水管中径向插入圆柱棒的方法,对旋转涡绳(RVR)进行了实验研究。对尾水管、转轮室和螺旋机匣的压力进行测量,同时对涡轮轴进行应变和加速度测量,以仔细检查减缓系统的有效性。研究了三个部分负载工作点,分别对应于导叶伺服行程相对于最佳效率点开度的83%、72%和68%。结果表明,该系统在各工况下,特别是在低负荷工况下,都能有效地抑制涡流绳的有害影响。具体来说,在三个被调查的工作点上,RVR流道腔内基本模态的压力幅值相对于未缓解的幅值分别降低了84%、63%和73%。在涡轮轴上,RVR频率下轴向推力振荡的基本模态分别降低了65%、83%和95%。结果表明,在整个测量过程中,缓解措施并不会给涡轮机的时间平均效率带来高成本,在每个工作点达到最佳缓解效果的突出长度处,损失分别为2%、2.5%和3.2%。对于高水头的机器,由于高水头的引水管的相对重要性降低,因此罚款预计会更低。
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来源期刊
Renewable Energy
Renewable Energy 工程技术-能源与燃料
CiteScore
18.40
自引率
9.20%
发文量
1955
审稿时长
6.6 months
期刊介绍: Renewable Energy journal is dedicated to advancing knowledge and disseminating insights on various topics and technologies within renewable energy systems and components. Our mission is to support researchers, engineers, economists, manufacturers, NGOs, associations, and societies in staying updated on new developments in their respective fields and applying alternative energy solutions to current practices. As an international, multidisciplinary journal in renewable energy engineering and research, we strive to be a premier peer-reviewed platform and a trusted source of original research and reviews in the field of renewable energy. Join us in our endeavor to drive innovation and progress in sustainable energy solutions.
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