NDLI: Prediction and Analysis of the Axial Force of Pump-Turbine during Load-Rejection Process

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Prediction and Analysis of the Axial Force of Pump-Turbine during Load-Rejection Process

Content Provider	Scilit
Author	Li, Xiangyang Mao, Zhongyu Lin, Wenhua Bi, Huili Tao, Ran Wang, Zhengwei
Copyright Year	2020
Description	Journal: Iop Conference Series: Earth and Environmental Science Load-rejection is an important process of pump-turbine unit. In this process, hydraulic characteristics would change greatly. The axial force of runner and of the entire shaft system will be impacted. This study focuses on a prototype pump-turbine unit. The axial force of this unit during load-rejection is predicted and analyzed. The hydraulic transient analysis can give a more accurate boundary condition of pumpturbine. The computational fluid dynamics simulation considering the full leakage in runner crown and shroud can have a comprehensive prediction of the axial force. Results show that the rotation speed, head and flow rate change during load-rejection process. The axial force is also influenced and changes. The law of axial force variation has a strong relationship with the flow rate variation law. The internal flow analysis found that the pressure difference between crown leakage and internal-runner near outlet is the key factor in inducing axial force. This pressure difference is strongly influenced by runner internal flow regime. During load-rejection process, flow rate strongly varies and causes the huge change of internal flow regime. This is the main reason that runner axial force changes positive and negative alternatively.
Related Links	https://iopscience.iop.org/article/10.1088/1755-1315/440/5/052081/pdf
ISSN	17551307
e-ISSN	17551315
DOI	10.1088/1755-1315/440/5/052081
Journal	Iop Conference Series: Earth and Environmental Science
Issue Number	5
Volume Number	440
Language	English
Publisher	IOP Publishing
Publisher Date	2020-02-01
Access Restriction	Open
Subject Keyword	Journal: Iop Conference Series: Earth and Environmental Science Aerospace Engineering Axial Force Load Rejection Process
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Physics and Astronomy Environmental Science

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