Browsing NTNU Open by Author "Acharya, Nirmal"
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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
Engøy, Andrea (Master thesis, 2019)Nepal har et stort potensial for vannkraft som ikke er utnyttet. Denne masteroppgaven er en del av det langvarige samarbeidet mellom Kathmandu University (KU) og Norges teknisk-naturvitenskapelige universitet (NTNU) for å ... -
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 ... -
Erosion in Francis turbines due to geometrical positioning of runner and guide vanes
Acharya, Nirmal (Doctoral theses at NTNU;2022:301, Doctoral thesis, 2022)Hydro-abrasive erosion in turbine components is one of the prominent operational challenges for hydropower plants located across basins of regions such as Himalayas in Asia, the Andes in South America, and Pacific coast. ... -
Erosion in Francis turbines due to geometrical positioning of runner and guide vanes
Acharya, Nirmal (HydroCen brief;Nr. 23, Report, 2022) -
Investigation of sediment erosion phenomenon for different blade angle distribution in Francis runner
Acharya, Nirmal; Trivedi, Chirag; Gautam, Saroj; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2021)Wear and tear of hydraulic turbine due to sediment erosion is one of the major problems in hydropower plants located in the Himalayan and Andes regions. High sediment concentration in water of such areas wears down the ... -
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 ... -
Review on erosion phenomenon, maintenance, and financial calculation of lifetime as an asset for Pelton turbines
Abregu Ochoa, Jim Furcio; Acharya, Nirmal; Solemslie, Bjørn Winther (Peer reviewed; Journal article, 2023)Prevention of greenhouse emissionsis the top priority for all countries, which urges them to switch to renewable energy as much as possible. Hydropower is one of the renewables that have high flexibility and at the same ... -
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 ...