Experimental Study and Numerical Simulation of the Flindt Draft Tube Rotating Vortex
Experimental Study and Numerical Simulation of the Flindt Draft Tube Rotating Vortex
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DOI：
10.1115/1.2409332
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发表时间：
2007-02
影响因子：
2
通讯作者：
G. Ciocan;M. Iliescu;T. Vu;B. Nennemann;F. Avellan
中科院分区：
文献类型：
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作者：
G. Ciocan;M. Iliescu;T. Vu;B. Nennemann;F. Avellan
通过实验和数值模拟研究了部分流量工况和无汽蚀工况下弗朗西斯涡轮机泄流环内旋转涡的动力学特性。二维激光多普勒测速仪，三维粒子图像测速仪，和非定常壁面压力测量进行彻底调查的速度和压力场的放电环，并获得涡动力学。进行了非定常RANS模拟，并与实验结果进行了比较。计算流场包括转轮和手肘形尾水管。对转轮17个流道的500，000个节点和尾水管的420，000个节点的网格尺寸进行了优化，以实现合理的CPU时间，从而很好地表示所研究的现象。详细的实验流场和计算流体动力学解决方案之间的比较收益率的一个很好的验证模型的尾水管旋转涡，然后，验证所提出的方法用于工业目的的应用。
The dynamics of the rotating vortex taking place in the discharge ring of a Francis turbine for partial flow rate operating conditions and cavitation free conditions is studied by carrying out both experimental flow survey and numerical simulations. 2D laser Doppler velocimetry, 3D particle image velocimetry, and unsteady wall pressure measurements are performs to investigate thoroughly the velocity and pressure fields in the discharge ring and to give access to the vortex dynamics. Unsteady RANS simulation are performed and compared to the experimental results. The computing flow domain includes the rotating runner and the elbow draft tube. The mesh size of 500,000 nodes for the 17 flow passages of the runner and 420,000 nodes for the draft tube is optimized to achieve reasonable CPU time for a good representation of the studied phenomena. The comparisons between the detailed experimental flow field and the CFD solution yield to a very good validation of the modeling of the draft tube rotating vortex and, then, validate the presented approach for industrial purpose applications.