Effects of fin installation on pressure fluctuation in a Francis turbine draft tube

ZHANG Ruizhi; NISHI Michihiro; LUO Xianwu

doi:10.7638/kqdlxxb-2020.0006

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Effects of fin installation on pressure fluctuation in a Francis turbine draft tube

更新时间：2026-05-28

- Effects of fin installation on pressure fluctuation in a Francis turbine draft tube
- Vol. 38, Issue 4, Pages: 788-795(2020)
- 作者机构：
  
  1. 清华大学二氧化碳减排与资源化利用技术北京市重点实验室,北京,100084
  2. 清华大学水沙科学与水利水电工程国家重点实验室,北京,100084
  3. 九州工业大学, 北九州市,日本,804-8550
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2020.0006
  CLC： TK73
- Published：2020
- 稿件说明：
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张锐志, 西道弘, 罗先武. 尾水管壁面加鳍对混流式水轮机压力脉动的影响[J]. 空气动力学学报, 2020, 38(4): 788-795.

ZHANG Ruizhi, NISHI Michihiro, LUO Xianwu. Effects of fin installation on pressure fluctuation in a Francis turbine draft tube[J]. 2020, 38(4): 788-795.
张锐志, 西道弘, 罗先武. 尾水管壁面加鳍对混流式水轮机压力脉动的影响[J]. 空气动力学学报, 2020, 38(4): 788-795. DOI： 10.7638/kqdlxxb-2020.0006.

ZHANG Ruizhi, NISHI Michihiro, LUO Xianwu. Effects of fin installation on pressure fluctuation in a Francis turbine draft tube[J]. 2020, 38(4): 788-795. DOI： 10.7638/kqdlxxb-2020.0006.

摘要

为了抑制混流式水轮机在部分负荷工况下的压力脉动，在尾水管直锥段设置鳍片是一种可取的工程措施。本文基于数值模拟方法细致考察了设置鳍片对混流式水轮机尾水管内部流动及压力脉动的影响。结果表明：鳍通过改变鳍周围的速度和压力分布，并作用于涡的演变过程，进而影响尾水管中的涡带运动和压力脉动。在非空化工况下，鳍表面产生的附鳍小涡带起到稳定压力场的作用，降低了尾水管直锥段的压力脉动；而附鳍小涡带与主流区涡带的相互作用则恶化了尾水管弯肘段的流动，反而使得弯肘段压力脉动略微回升；在空化工况下，尾水管壁面加鳍显著降低涡带规模和空泡体积，使得尾水管的压力脉动得到明显削弱。

Abstract

To alleviate pressure fluctuation inside a Francis turbine draft tube working under part-load operation

a fin installed on the wall of the conical part is one effective method in engineering application. This paper investigates the effects of fin installation on the internal flow and pressure fluctuation inside the draft tube based on numerical calculation. Results show that a fin can change the velocity and pressure distribution around the fin. Further

the fin affects the vortex evolution in draft tube and consequently changes vortex rope and pressure fluctuation. Under non-cavitation condition

an extra small vortex rope occurs near the fin

which plays the role of pressure stabilizer and decreases the pressure fluctuation amplitude in the conical part. It is the interaction of the extra small vortex rope with the vortex rope in mainstream results in the complicated flow in the elbow part of the draft tube. As a result

in the elbow

there is a slight increase of pressure fluctuation amplitude. Under cavitation condition

the fin reduces the size of both vortex rope and cavity

and suppresses the pressure fluctuation in the whole draft tube.

关键词

Keywords

references

JACOB T. Pressure fluctuations of francis turbines: model and prototype test results[C]//Modeling, Testing and Monitoring for hydropower plants-Ⅱ, Lausanne, Switzerland, 1996.

JACOB T, PRÉNAT J E. Francis turbine surge: discussion and data base[C]//Proceedings of 18th IAHR Symposium, Valencia. Spain, 1996.

LUO X W. Pressure fluctuation analysis for Francis turbine draft tube with air admission[C]//14th national symposium on hydrodynamics i.e. 28th national symposium on hydrodynamics (part Ⅰ). Shanghai: Journal of Hydrodynamics, 2017: 649-664. (in Chinese)

RHEINGANS W J. Power swings in hydroelectric power plants[J]. Transactions of the ASME, 1940, 62:171-184.

CASSIDY J J, FALVEY H T. Frequency and amplitude of pressure surges generated by swirling flows[C]//IAHR Section Hydraulic Machinery, Equipment, and Cavitation, 5th Symposium, 1970, Stockholm, Sweden.

XU H Q, MENG X C, ZHANG H P, et al. Theory of cavitation bubbles conglomeration endangering stability of hydraulic machinery Ⅲ:effects on pressure fluctuations of vortex rope coming from cavitation bubbles conglomeration in draft tube[J]. Journal of Hydroelectric Engineering, 2013, 32(4):204-208. (in Chinese)

DÖRFLER P, SICK M, COUTU A. Flow-induced pulsation and vibration in hydroelectric machinery[M]. London:Springer-Verlag, 2013.

ARPE J, NICOLET C, AVELLAN F. Experimental evidence of hydroacoustic pressure waves in a francis turbine elbow draft tube for low discharge conditions[J]. ASME Journal of Fluids Engineering, 2009, 131(8):0811021-1-9.

YAMAMOTO M, MVLLER A, FAVREL A, et al. Pressure measurements and high speed visualizations of the cavitation phenomena at deep part load condition in a Francis turbine[C]//27th IAHR Symposium on Hydraulic Machinery and Systems, IOP Conf. Series: Earth and Environmental Science, 2014, 22: 022011.

ZHOU L J, WANG Z W. Pressure Fluctuations in a francis turbine draft tube calculated by cavitating flow simulation[J]. Journal of Tsinghua University (Science and Technology), 2008, 48(6):972-976. (in Chinese)

NISHI M, WANG X M, YOSHIDA K, et al. An experimental study on fins, their role in control of the draft tube surging[J]. Hydraulic Machinery and Cavitation, 1996:905-914.

NISHI M, KAWAI K, YOSHIDA K, et al. Installation of a fin as a means to alleviate the draft tube surging[C]//Proc Third ASME/JSME Joint Fluids Engineering Conf, San Francisco, 1999: 99-7209.

DMITRY P, ANDREY, M, DMITRY D. The study of the influence of stabilizing devices on the pressure pulsations at the free discharge of water through the turbine[C]//MATEC Web of Conferences, 2017, 115: 06002.

NAKANISHI K, UEDA T. Air Supply into Draft Tube of Francis Turbine[J]. Fuji Electric Review, 1964, 10:81-91.

QIAN Z D, YANG J, HUAI W. Numerical simulation and analysis of pressure pulsation in francis hydraulic turbine with air admission[J]. Journal of Hydrodynamics, Ser B, 2007, 19(4):467-472.

LIAO W L, JI J T, LU P, et al. Effect of air admission through center hole of turbine shaft on the flow in draft tube[J]. Journal of Hydraulic Engineering, 2008, 39(8):1005-1011.

YU A. Analysis of the pressure fluctuations and vortical flow characteristics in a francis turbine draft tube with air admission[D]. Tsinghua University, 2017. (in Chinese)

NISHI M, YOSHIDA K, FUJII M, et al. A study on hybrid control of draft tube surge[C]//Proceedings of the XXIst IAHR Symposium on Hydraulic Machinery and Systems, Lausanne Switzerland, 2002.

ZWART P J, GERBER A G, BELAMRI T. A two-phase flow model for predicting cavitation dynamics[C]//Fifth International Conference on Multiphase Flow, Yokohama, Japan, 2004.

MA Z Y, CHEN J, NISHI M. Numerical research on fins to alleviate draft tube surging[J]. Journal of Dalian University of Technology, 2003, 43(2):181-186. (in Chinese)

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