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Numerical study on the characteristics of transient flow in the Jinping II hydropower system with a differential surge shaft
2009 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

System flow control components, such as valves or pumps are a part of routine operation in a water distribution system. When a flow control component changes state the steady-state flow condition in the system is altered. The values of the initial flow conditions of the system, characterized by the measured velocity and pressure at positions along the pipeline change with time until the final flow conditions are established in a new steady-state condition. The physical phenomenon that occurs during this time interval is known as a hydraulic transient. Transients resulting from more rapid changes in flow rate are called waterhammer. The waterhammer causes excessively high and low pressures, which can lead to failure in the pipe system. The implementation of a surge tank is a method to intercept and reduce rapidly these extreme pressure situations. For the new hydropower station Jinping 2 in Sichuan province Southwest of china, the optimum type and dimensions of a surge shaft need to be determined. Within this thesis, a Matlab program is applied to determine the highest and lowest pressures in the pipe system, especially at the valve. Further the mass oscillations in the tank are of significant interest. The investigated surge shaft is a differential surge shaft. Variation of the dimensions of the orifice, the riser, and the maintank, and their interdependency are observed, reported and the optimum dimensions are determined. Another group of students has performed a similar investigation for a throttled surge shaft alternative, and the final results are compared between the differential and throttled surge shaft designs.

Place, publisher, year, edition, pages
2009.
Keyword [en]
Technology, Vattenkraft, svallgalleri, numeriska beräkningar, svallning, tryckslag
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-56142ISRN: LTU-EX--09/125--SELocal ID: cef87ab9-8c7a-406c-ae88-529f70b33dcbOAI: oai:DiVA.org:ltu-56142DiVA: diva2:1029529
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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Output format
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