Mitigation of pressure fluctuations in the discharge cone of hydraulic turbines using Flow-Feedback

被引:5
作者
Tanasa, C. [1 ]
Susan-Resiga, R. [1 ]
Bosioc, A. [1 ]
Muntean, S. [2 ]
机构
[1] Politehn Univ Timisoara, Dept Hydraul Machinery, Bv Mihai Viteazu 1, RO-300222 Timisoara, Romania
[2] Romanian Acad, Ctr Adv Res Engn Sci, Timisoara Branch, RO-300223 Timisoara, Romania
来源
25TH IAHR SYMPOSIUM ON HYDRAULIC MACHINERY AND SYSTEMS | 2010年 / 12卷
关键词
D O I
10.1088/1755-1315/12/1/012067
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Our previous experimental and numerical investigations of decelerated swirling flows in conical diffusers have demonstrated that water jet injection along the symmetry axis mitigates the pressure fluctuations associated with the precessing vortex rope. However, for swirling flows similar to Francis turbines operated at partial discharge, the jet becomes effective when the jet discharge is larger than 10% from the turbine discharge, leading to large volumetric losses when the jet is supplied from upstream the runner. As a result, we introduce in this paper a new approach for supplying the jet by using a fraction of the discharge collected downstream the conical diffuser. We present the technical implementation of this flow-feedback approach, and we investigated experimentally its capability in mitigating the pressure fluctuations generated by the precessing vortex rope. The main advantage of this flow-feedback approach is that is does not require additional energy to supply the jet and it does not decrease the turbine efficiency.
引用
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页数:9
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