Effect of water jet area on mitigation of vortex rope in a Francis turbine

被引:5
作者
Kumar, Sandeep [1 ]
Gandhi, Bhupendra K. [1 ]
机构
[1] Indian Inst Technol, Dept Mech & Ind Engn, Roorkee 247667, Uttarakhand, India
关键词
SWIRLING FLOW; SUPPRESSION;
D O I
10.1063/5.0172549
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The rotating vortex rope (RVR) is normally formed at part load operating conditions, which develops flow instability in the draft tube (DT) cone of a Francis turbine. The detrimental effects of RVR reduce the life and performance of the turbine. The present work mitigates RVR through axial water jet injection in the DT cone. This paper extends the author's previous work on water injection with a 50% reduction in the water jet area through two nozzles with a diameter of 12.7 mm. The effect of area reduction is analyzed by spectral analysis like power spectrum density and spatial harmonic decomposition of the pressure field measured at the wall of the cone. The effect of water jet injection on synchronous and asynchronous pressure pulsations is analyzed at both measurement planes of the cone. The improvement in pressure recovery in the cone and turbine efficiency due to water jet injection is also analyzed. The water is injected at 0.5%-2% of the turbine inlet flow at 22.10degree celsius guide vane opening.
引用
收藏
页数:16
相关论文
共 43 条
[1]   Investigation of cavitating vortex rope instabilities and its suppression inside a Francis turbine model with Thoma number variation [J].
Abu Shahzer, Mohammad ;
Cho, Yong ;
Shamsuddeen, Mohamed Murshid ;
Kim, Jin-Hyuk .
PHYSICS OF FLUIDS, 2023, 35 (03)
[2]   Mitigation of flow-induced pressure fluctuations in a Francis turbine operating at the design and partial load regimes-LES simulations [J].
Altimemy, Muhannad ;
Attiya, Bashar ;
Daskiran, Cosan ;
Liu, I-Han ;
Oztekin, Alparslan .
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 2019, 79
[3]   Unsteady pressure measurements and numerical investigation of the jet control method in a conical diffuser with swirling flow [J].
Bosioc, A. I. ;
Tanasa, C. ;
Muntean, S. ;
Susan-Resiga, R. F. .
25TH IAHR SYMPOSIUM ON HYDRAULIC MACHINERY AND SYSTEMS, 2010, 12
[4]   Experimental study of swirling flow from conical diffusers using the water jet control method [J].
Bosioc, Alin Ilie ;
Tanasa, Constantin .
RENEWABLE ENERGY, 2020, 152 :385-398
[5]   Unsteady Pressure Analysis of a Swirling Flow With Vortex Rope and Axial Water Injection in a Discharge Cone [J].
Bosioc, Alin Ilie ;
Susan-Resiga, Romeo ;
Muntean, Sebastian ;
Tanasa, Constantin .
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME, 2012, 134 (08)
[6]   Optimal design of J-groove shape on the suppression of unsteady flow in the Francis turbine draft tube [J].
Chen, Zhenmu ;
Baek, Seok-Heum ;
Cho, Hyunkyoo ;
Choi, Young-Do .
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, 2019, 33 (05) :2211-2218
[7]   Suppression of unsteady swirl flow in the draft tube of a Francis hydro turbine model using J-Groove [J].
Chen, Zhenmu ;
Singh, Patrick Mark ;
Choi, Young-Do .
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, 2017, 31 (12) :5813-5820
[8]   Flow in the Simplified Draft Tube of a Francis Turbine Operating at Partial Load-Part II: Control of the Vortex Rope [J].
Foroutan, Hosein ;
Yavuzkurt, Savas .
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, 2014, 81 (06)
[9]  
Gogstad P.J., 2017, EXPT INVESTIGATION M
[10]   Experimental investigation of an adjustable guide vane system in a Francis turbine draft tube at part load operation [J].
Joy, Jesline ;
Raisee, Mehrdad ;
Cervantes, Michel J. .
RENEWABLE ENERGY, 2023, 210 :737-750