Browsing NTNU Open by Author "Chitrakar, Sailesh"
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Application of hydro-abrasive erosion model from IEC 62364:2019 standard in Francis turbines
Acharya, Nirmal; Gautam, Saroj; Chitrakar, Sailesh; Trivedi, Chirag; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2022)Hydro-abrasive erosion in hydraulic turbines is critical and one of the prominent issue due to its association with maintenance costs and production losses in the hydropower plant. IEC 62364:2019* standard guide focuses ... -
Development of a Francis Turbine Test Rig at Kathmandu University
Bådsvik, Julia Kiri Ellinor (Master thesis, 2019)Denne masteroppgaven er en del av prosjektet EnergizeNepal, som har som mål å utvikle og bygge en francisturbin-testrigg for Universitetet i Kathmandu som oppfyller kravene i IEC60193. Nepal har store vannkraftressurser, ... -
Development of simplified model for prediction of sediment induced erosion in Francis turbine’s sidewall gaps
Acharya, Nirmal; Gautam, Saroj; Chitrakar, Sailesh; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2022)Sediment induced erosion in exposed components of hydraulic turbines is a major issue in most of the sediment laden hydropower projects. Gradual removal of material can change the components profile which can lead to change ... -
Leakage Vortex Progression through a Guide Vane’s Clearance Gap and the Resulting Pressure Fluctuation in a Francis Turbine
Acharya, Nirmal; Gautam, Saroj; Chitrakar, Sailesh; Trivedi, Chirag; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2021)A clearance gap (CG) between guide vanes (GVs) and facing plates exists at both ends of a Francis turbine and allows the opening angle to be adjusted for varying operating conditions. Leakage flow is induced through this ... -
Numerical and experimental investigation of erosive wear in Francis runner blade optimized for sediment laden hydropower projects in Nepal
Gautam, Saroj; Acharya, Nirmal; Lama, Ram; Chitrakar, Sailesh; Neopane, Hari Prasad; Zhu, Baoshan; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2022)The design of the Francis turbine aims to maximize its performance in terms of efficiency. This design approach has overlooked effects on the turbine due to sediment erosion for power plants operating under high sediment ... -
Numerical investigation of a Pelton turbine at several operating conditions
Gautam, Saroj; Chitrakar, Sailesh; Neopane, Hari Prasad; Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2022)The use of Computational Fluid Dynamics (CFD) for predicting the flow behaviour in Pelton turbines is limited by the complex nature of the flow, interaction between the jets and interference of the water after the impact ... -
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 the labyrinths of Francis turbine: A numerical study
Gautam, Saroj; Acharya, Nirmal; Chitrakar, Sailesh; Neopane, Hari Prasad; Iliev, Igor; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2022)Development of new hydropower projects in Himalayan regions aims for the efficient performance of the turbine with lesser operation and maintenance cost. Over the past two decades, significant efforts have been made to ... -
Study of sediment erosion in guide vanes of Francis turbine
Nora, Lars Petter (Master thesis, 2016)The Himalayas and the Andes mountains are regions with some of the worlds biggest hydropower potential. One of the biggest problems facing the development of these resources are high concentrations of hard minerals in the ... -
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 ...