Thomas Staubli
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View article: Efficiency Testing of Pelton Turbines with Artificial Defects—Part 1: Buckets
Efficiency Testing of Pelton Turbines with Artificial Defects—Part 1: Buckets Open
Pelton turbines are susceptible to hydro-abrasive erosion from sediment-laden flows, resulting in a progressive loss of efficiency. Typical defect classes can be derived from the analysis of such damage observed in hydropower plants. A sys…
View article: Efficiency Testing of Pelton Turbines with Artificial Defects—Part 2: Needles and Seat Rings
Efficiency Testing of Pelton Turbines with Artificial Defects—Part 2: Needles and Seat Rings Open
The erosion of Pelton turbine components in mountainous areas with high sediment input is a major challenge for energy- and cost-efficient operation. Quantitative data on possible efficiency losses associated with local damage are needed. …
View article: Evaluation of Forces on the Needle for Regulation of Pelton Turbine Injector
Evaluation of Forces on the Needle for Regulation of Pelton Turbine Injector Open
In hydropower plants, the Pelton turbine is a commonly used hydraulic turbine where flow is regulated with a dual mechanism of needle and deflector. The needle is controlled by a servomotor and governor system, where the flow rate varies b…
View article: Measurement of the jet deflector torque for model Pelton turbine and associated uncertainties in test rig development
Measurement of the jet deflector torque for model Pelton turbine and associated uncertainties in test rig development Open
Hydraulic turbines play an important role in stabilizing electrical grids due to their fast response times. Comparative to other hydraulic turbines, a jet deflector of a Pelton turbine enables rapid response for load reduction. However, je…
View article: Analysis and visualization of progressive erosion in Pelton buckets
Analysis and visualization of progressive erosion in Pelton buckets Open
Hydropower plants operating in fragile mountainous regions face severe hydro-abrasive erosion of hydraulic components, which results in drop in efficiency, frequent interruptions in power generation and downtime for repair/replacement. Due…
View article: Analysis of hydro-abrasive erosion and efficiency changes measured on the coated Pelton turbines of HPP Fieschertal
Analysis of hydro-abrasive erosion and efficiency changes measured on the coated Pelton turbines of HPP Fieschertal Open
Geometrical changes and material loss of Pelton turbine runners as well as changes in turbine efficiency have been measured at HPP Fieschertal in Valais, Switzerland since 2012. The HPP is equipped with two horizontal axis Pelton units, wi…
View article: Financial analysis for optimization of hydropower plants regarding hydro-abrasive erosion: A study from Indian Himalayas
Financial analysis for optimization of hydropower plants regarding hydro-abrasive erosion: A study from Indian Himalayas Open
The hydro-abrasive erosion poses challenges for smooth and efficient operation of existing as well as new hydropower plants (HPP). The loss in revenue is caused due to reduced generation on account of reduced efficiency, erosion of plant m…
View article: Erosion of Pelton buckets and changes in turbine efficiency measured in the HPP Fieschertal
Erosion of Pelton buckets and changes in turbine efficiency measured in the HPP Fieschertal Open
Geometrical changes and material loss of Pelton turbine runners as well as changes in turbine efficiency were measured at HPP Fieschertal in Valais, Switzerland. The HPP is equipped with two horizontal axis Pelton units, with each 32 MW no…
View article: Forces acting on particles in a Pelton bucket and similarity considerations for erosion
Forces acting on particles in a Pelton bucket and similarity considerations for erosion Open
High sediment transport rates cause severe erosion issues in hydropower plants leading to interruptions in power generation, decrease in efficiency and shutdown for repair and maintenance. For Pelton turbines operating at high head, the is…