Steady and transient pressure measurements on the runner blades of a Kaplan turbine model
2015 (English)Conference paper, Presentation (Refereed)
The development of renewable energy sources has increased the need for power regulation. Power system regulation is mainly performed by hydropower plants through load variations. Additional forces are exerted on the runner blades during these load variations. This paper deals with pressure measurement performed on the blades of a Kaplan turbine model under steady state and load variation conditions. Flow behavior and frequency content of the pressure are investigated and compared to find critical condition in terms of pressure fluctuation. The results show that at various operating points and conditions, different regions of the blade are important. During load rejection, a considerable amount of pressure fluctuations are exerted on the runner blades. These results will be used to define experiments to be performed on the corresponding prototype. On the prototype, the loads acting on the runner blades will be investigated at various operation points similar to the model. In addition, the relation between the frequency content on the blades and loads on the main shaft will be investigated. Comparing results from model and prototype eventually would be valuable to explore the flow characteristics in prototype since CFD simulation of prototype is challenging.
Place, publisher, year, edition, pages
Research subject Fluid Mechanics
IdentifiersURN: urn:nbn:se:ltu:diva-26989Local ID: 0483c990-33a4-4860-b187-6204b09379e3OAI: oai:DiVA.org:ltu-26989DiVA: diva2:1000170
IAHR meeting of the Working Group “Cavitation and dynamic problems" : 09/09/2015 - 11/09/2015
Godkänd; 2015; 20150918 (arasol)2016-09-302016-09-30Bibliographically approved