Sailesh Chitrakar
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View article: IoT-Enabled Smart Metering to Enhance Energy Management for Day-Ahead Electricity Price Forecasting
IoT-Enabled Smart Metering to Enhance Energy Management for Day-Ahead Electricity Price Forecasting Open
In the realm of electricity generation, the output of generating units fluctuates throughout the day mirroring the dynamic nature of energy demand. While alterations on the generation side are limited post-installation, areas for intervent…
View article: Impact of Climate Change on Hydroelectric Generation in Run-of-River: A Case Study of Mahipar Hydropower Plants
Impact of Climate Change on Hydroelectric Generation in Run-of-River: A Case Study of Mahipar Hydropower Plants Open
Climate change is one of the harmful environmental issues, characterized by increasing global temperature, varies in rainfall patterns, changes in precipitation timing and intensity, and a decline in snowfall. Since the hydroelectric gener…
View article: Finite Element Method Based Technical Investigation of ICEV Chassis with EV Conversion Module
Finite Element Method Based Technical Investigation of ICEV Chassis with EV Conversion Module Open
Nepal is shifting towards cleaner and sustainable means of transportation through import of electricvehicles and conversion of conventional vehicles into electric. The conversion process requiresstatic and dynamic analysis of vehicle chass…
View article: Repair and Maintenance of Francis Turbine Runners in Nepal: Issues and Challenges
Repair and Maintenance of Francis Turbine Runners in Nepal: Issues and Challenges Open
Rapid growth in hydropower development has resulted in a large number of Francis turbine installations in Nepal. Sediment erosion of turbine components due to high sediment concentration and abundance of hard minerals is a serious challeng…
View article: Study on the performance of Francis runner under variable speed operation at different operating conditions
Study on the performance of Francis runner under variable speed operation at different operating conditions Open
Hydro-turbines are designed to operate at a fixed synchronous speed to maintain grid frequency. However, these turbines are often pushed to operate at off-design condition in order to meet the energy demand in the market or to match the fl…
View article: lnfluence of Geometrical Parameters on the Sealing behavior of Band side Stepped Labyrinth seals of Francis turbine
lnfluence of Geometrical Parameters on the Sealing behavior of Band side Stepped Labyrinth seals of Francis turbine Open
The sealing behaviour of labyrinth seals plays a crucial role in minimizing leakage losses by preventing unwanted flow between high-pressure and low-pressure regions and hence, enhancing the efficiency of Francis turbines. Stepped labyrint…
View article: Parametric Modeling of Pelton Bucket and the effect of the bucket depth on sediment erosion
Parametric Modeling of Pelton Bucket and the effect of the bucket depth on sediment erosion Open
Nepal has a huge potential in hydropower, where Pelton turbines have emerged as a preferred choice due to high-head mountainous terrain and geography. However, sediment laden water is responsible for the erosion in the bucket. This researc…
View article: Numerical Study of Erosion in Pelton Injector System Implementing the Effect of Gravity on Lagrangian Particles with Different Size
Numerical Study of Erosion in Pelton Injector System Implementing the Effect of Gravity on Lagrangian Particles with Different Size Open
The spear valve is among the most vulnerable part of a Pelton turbine system operating in rivers with sediments. The spear valve regulates water flow into the Pelton buckets. The erosion is found to be severe while operating in low opening…
View article: Exploring the Impact of Biomimetic Flaps on the Aerodynamics of a Naca-2412 Airfoil
Exploring the Impact of Biomimetic Flaps on the Aerodynamics of a Naca-2412 Airfoil Open
This study investigates the aerodynamic performance of a NACA 2412 airfoil with biomimetic flaps inspired by avian covert feathers. Three flap configurations—varied in size (100 mm, 200 mm, 300 mm) and chordwise position (0.2c, 0.5c, 0.8c)…
View article: Leakage Flow in Staggered Labyrinth Seals: An Analytical Approach for Incompressible Fluids
Leakage Flow in Staggered Labyrinth Seals: An Analytical Approach for Incompressible Fluids Open
Staggered labyrinth seals are essential components in the turbine industry. These are crucial in reducing leakage flow through rotating and stationary components. Although numerous models exist to estimate leakage flow in such systems, mos…
View article: Trend Analysis of Repair and Maintenance Capacity in Context of Nepalese Hydropower
Trend Analysis of Repair and Maintenance Capacity in Context of Nepalese Hydropower Open
Nepal's hydropower sector faces numerous challenges due to sediment erosion resulting from the country's steep terrain, fragile geological structure, and intense monsoon rainfall. These elements, along with off-design operational dif
View article: Performance analysis of sand-casted model Francis runner with detachable blade: efficiency measurement, and evaluation
Performance analysis of sand-casted model Francis runner with detachable blade: efficiency measurement, and evaluation Open
Hydropower is an emission-free technology that harnesses energy from flowing water. Francis turbines have been widely utilized in hydropower plants. The complex process of manufacturing turbines requires highly trained labor and special eq…
View article: Analysis and quantification of erosion pattern due to sediment containing flow by experimental technique
Analysis and quantification of erosion pattern due to sediment containing flow by experimental technique Open
Sediment erosion shortens the lifespan and efficiency of hydraulic turbines and create risks in their operation and maintenance. Various factors contribute to this erosion in turbine components. This paper presents the development and test…
View article: Comprehensive Review of Sediment Erosion Mechanisms and Their Impact on Francis Turbines
Comprehensive Review of Sediment Erosion Mechanisms and Their Impact on Francis Turbines Open
Sediment erosion significantly affects hydraulic machinery, particularly Francis turbines operating in sediment-laden flows. This phenomenon plays a crucial role in reducing the energy output and operational challenges. Given that, Francis…
View article: Development of a Scaled Down Horizontal Axis Wind Turbine for Wind Tunnel Tests
Development of a Scaled Down Horizontal Axis Wind Turbine for Wind Tunnel Tests Open
This paper presents a method to design and develop scaled down models of Horizontal Axis Wind Turbine (HAWT) to test in a limited sized wind tunnel. The mathematical design of a HAWT is carried out at a rated speed of 5 m/s, by using QBlad…
View article: Experimental investigation of vibrational signal in a fault induced Francis runner
Experimental investigation of vibrational signal in a fault induced Francis runner Open
Hydro turbines are prone to failure and the detection of fault in turbine is essential to ensure the reliability of power plant. This study investigates vibrational signals in a fault-induced Francis turbine using an experimental test setu…
View article: Evaluation of different erosion models for predicting guide vane wear in Francis turbine
Evaluation of different erosion models for predicting guide vane wear in Francis turbine Open
Guide vanes (GVs) are one of the components of the Francis turbine that are most vulnerable to erosion. Presence of hard minerals including feldspar and quartz cause erosion on the surface of GVs. This results in damage and disturbances in…
View article: Experimental Study for Investigation of Pressure Distribution in a Pelton Injector Under Needle Erosion
Experimental Study for Investigation of Pressure Distribution in a Pelton Injector Under Needle Erosion Open
View article: Experimental Investigations of Sediment Erosion in Francis Turbine Using Non‐Recirculating Sediment Test Rig
Experimental Investigations of Sediment Erosion in Francis Turbine Using Non‐Recirculating Sediment Test Rig Open
Water‐suspended sediments wear down hydro turbine components by erosion, reducing their lifetime. Nonetheless, even heavily sediment‐loaded rivers are a valuable renewable and clean energy resource. Forecasting sediment erosion and optimiz…
View article: Review on experimental investigation of sediment erosion in hydraulic turbines
Review on experimental investigation of sediment erosion in hydraulic turbines Open
Sediment erosion in turbine materials is caused by various flow phenomena. The study of these phenomena can identify suitable measures to minimize their effect on the turbine. Various experimental test rigs have been developed alongside nu…
View article: Correlating Sediment Erosion in Rotary–Stationary Gaps of Francis Turbines with Complex Flow Patterns
Correlating Sediment Erosion in Rotary–Stationary Gaps of Francis Turbines with Complex Flow Patterns Open
Secondary flows in Francis turbines are induced by the presence of a gap between guide vanes and top–bottom covers and rotating–stationary geometries. The secondary flow developed in the clearance gap of guide vanes induces a leakage vorte…
View article: Experimental Investigations of Sediment Erosion in Guide Vanes of Francis Turbine
Experimental Investigations of Sediment Erosion in Guide Vanes of Francis Turbine Open
Guide vanes are the cascade of hydrofoil like structures surrounding the Francis turbine runner which guides the water from spiral casing and controls the flow to the turbine. A large portion of hydraulic energy of incoming flow is convert…
View article: Numerical study on the optimal design of straight-through labyrinth seals for minimum leakage loss of Francis turbine
Numerical study on the optimal design of straight-through labyrinth seals for minimum leakage loss of Francis turbine Open
Labyrinth seals are important non-contact seals in Francis turbine. They help to reduce leakage flow from high to low-pressure regions. Therefore, this study focuses on the design of labyrinth seals providing more difference in pressure an…
View article: Numerical study of flow phenomena and erosion in three guide vane cascade rig
Numerical study of flow phenomena and erosion in three guide vane cascade rig Open
The rivers in certain geological regions like South Asia have sediment particles in them. These particles cause erosion in turbine components which is a major cause of deterioration of turbine and hampers efficient energy production. Out o…
View article: Signature investigation of misaligned jet in Pelton turbines due to flow obstruction in nozzle
Signature investigation of misaligned jet in Pelton turbines due to flow obstruction in nozzle Open
This paper presents a part of the research works related to early stage fault detection and diagnosis of hydraulic turbines. The research works are currently focused on creating a database of the distinctive signals of the faults in the tu…
View article: Numerical study of nozzle erosion and its cascading impact on jet quality
Numerical study of nozzle erosion and its cascading impact on jet quality Open
Sediment erosion is one of the major factors affecting the overall efficiency of hydro-turbines working under sediment laden conditions. The erosion not only decreases the efficiency but also changes the flow characteristics. However, the …
View article: Design and Performance study of Francis turbine for high head applications.
Design and Performance study of Francis turbine for high head applications. Open
Francis Turbines are widely employed globally for their adaptability and operational versatility across a broad range of water flow rates and pressure heads. This study explores the design and optimization of a Francis turbine configured f…
View article: Wear Measurement of a Francis Runner damaged by sediment erosion: A case study
Wear Measurement of a Francis Runner damaged by sediment erosion: A case study Open
Hydropower is one the biggest sources of electricity all over the world and the largest by far in Nepal. Francis Turbines are extensively used in hydropower plants due to flexible ranges of head and discharge. Sediment erosion has been a m…
View article: Credibility Evaluation of Sand-Casting Technique for Manufacturing Francis Runner
Credibility Evaluation of Sand-Casting Technique for Manufacturing Francis Runner Open
Francis turbine with its intricate design and the critical nature of its components, involves several complexities and challenges for manufacturing. Francis runners are usually fabricated using high-quality alloy steel. In this study, a 2 …
View article: Fault Detection in Turbines Using Machine Learning: A study of the capabilities of Various Classification Algorithms
Fault Detection in Turbines Using Machine Learning: A study of the capabilities of Various Classification Algorithms Open
This paper presents a comprehensive study of application of different machine learning techniques for the prediction of turbine faults in an early stage. As the need to ensure an optimal turbine operation through early stage fault detectio…