• Numerical investigation of the effet of leakage flow through erosion-induced clearance gaps of guide vanes on the performance of Francis turbines 

      Chitrakar, Sailesh; Dahlhaug, Ole Gunnar; Neopane, Hari Prasad (Journal article; Peer reviewed, 2018)
      Abrasive wear in the clearance gap of guide vanes (GVs) increases the gap size, which deteriorates the flow and causes loss of efficiency. This paper investigates the performance of a Francis turbine including erosion-induced ...
    • Review on numerical techniques applied in impulse hydro turbines 

      Chitrakar, Sailesh; Solemslie, Bjørn Winther; Neopane, Hari Prasad; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2020)
      Impulse turbines are widely used in hydropower plants around the world due to their high efficiency in a larger operating range compared to reaction turbines. State of the art Pelton turbines can give over 90% efficiency ...
    • Secondary Flow and Sediment Erosion in Francis Turbines 

      Chitrakar, Sailesh (Doctoral theses at NTNU;2018:190, Doctoral thesis, 2018)
      Sediment erosion of the hydropower turbine components is one of the key challenges due to the constituent of hard particles in the rivers of Himalayas and Andes. In these regions, Quartz is found as a main constituent (more ...
    • Sediment Erosion in Hydro turbines 

      Neopane, Hari Prasad (Doktoravhandlinger ved NTNU, 1503-8181; 2010:104, Doctoral thesis, 2010)
      Sediment erosion is caused by the dynamic action of sediment flowing along with water impacting against a solid surface. Hydraulic turbine components operating in sediment-laden water are subject to abrasive and erosive ...
    • The numerical and experimental investigation of erosion induced leakage flow through guide vanes of Francis turbine 

      Chitrakar, Sailesh; Dahlhaug, Ole Gunnar; Neopane, Hari Prasad (Journal article; Peer reviewed, 2019)
      In Guide Vanes (GV) of Francis turbines, a portion of the pressure head of water converts into velocity head. This causes high acceleration of the flow in GV before reaching the runner. Furthermore, GVs are accompanied ...