Study of Leakage Flow and Erosion in Francis Turbines

Objectives:
To study the Leakage Flow through Clearance Gap and interaction
of leakage flow with erosion.
To study the interaction of leakage flow with runner
To study the effect of leakage flow-induced erosion on turbine
performance.

Expected Outcomes:
The overarching objective of this research is to investigate the intricate dynamics associated with leakage flow in a turbine system and its consequential interactions with critical components. The first objective focuses on comprehensively studying the Leakage Flow through the Clearance Gap and its interaction with erodent particles. By delving into this aspect, the research aims to unravel the complex mechanisms governing leakage flow dynamics and its interplay with erodent particles within the guide vane. Through meticulous analysis, the study seeks to identify the factors influencing this interaction and develop a nuanced understanding of the resultant effects on guide vane.
Moving forward, the second objective aims to extend this investigation to the interaction of leakage flow with the runner, a pivotal component in hydropower generation. This entails a thorough examination of the effects of leakage flow on the runner, with a specific emphasis on its impact on erosion at the leading edge. By elucidating the flow patterns and forces exerted on the runner by leakage flow, the research seeks to establish a comprehensive understanding of how this interaction contributes to the overall operation of the turbine. The insights gained from this objective will be crucial in optimizing turbine design and performance, considering the intricate relationship between leakage flow and the runner. The third objective builds upon the knowledge acquired from the previous two by specifically addressing the consequences of leakage flow-induced erosion on turbine performance. This involves a quantitative assessment of the erosion caused by leakage flow on runner and guide vane. Furthermore, the objective aims to establish a direct correlation between erosion levels and the degradation of turbine performance. By doing so, the study seeks to not only quantify the extent of erosion but also provide valuable insights into the potential strategies for mitigating its adverse effects. This objective is essential for developing a holistic understanding of the long-term impact of leakage flow-induced erosion on turbine efficiency and longevity. Collectively, these objectives align to form a comprehensive research framework with the overarching goal of advancing the understanding of leakage flow dynamics and its implications for turbine performance. The outcomes of this research are expected to provide a foundation foroptimizing turbine design, enhancing performance, and extending the operational lifespan of Francis turbine systems.

Supervisors from host and Partner Universities
Dr. Bhola Thapa, Prof., KU
Dr. Sailesh Chitrakar, Asst. Prof., KU
Dr. Zhongdong Qian, Prof., WHU
Dr. Zhiwei Guo, Asso. Prof., WHU


About Myself
I’m Kushal Shrestha, a fun-loving and explorative individual currently navigating the intricate world of academia as a Ph.D. candidate from the batch of 2021. My research focus revolves around the fascinating realms of “Leakage Flow and Erosion in Francis Turbines,” delving into the complexities of fluid dynamics and erosion behavior of Francis turbine. I thrive on challenges and relish the opportunities presented by my involvement in the Hydro-Himalaya project, where I’ve been fortunate to contribute to cutting-edge research in the field. As I embark on the exciting and challenging path of academia, I am driven by a passion for contributing valuable insights to the scientific community and making a positive impact on the field of energy.

Kushal Shrestha
PhD Candidate
kushal.shrestha3@gmail.com
Batch: 2021

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