Characterization of a Commercial Axial Flow PAT Through a Structured Methodology Step-by-Step

Vásquez, Diego Penagos; Graciano-Uribe, Jonathan; Torres, Edward

doi:10.37934/cfdl.14.1.119

Cited by 3 publications

(2 citation statements)

References 49 publications

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“…Yang et al, [8] performed the validation of the characteristic curve comparing empirical relationships, obtaining an error of less than 3.33%. Other validations found have obtained errors of 12%, 5-10%, 7.41%, and 4%, concerning efficiency [17][18][19][20].…”

Section: State Of the Artmentioning

confidence: 85%

Influence of Leading and Trailing Edge Angle on Impeller Blades of a Pump as Turbine

Diego Penagos-Vasquez,

Jonathan Graciano-Uribe,

Luis Grisales-Noreña

et al. 2023

ARFMTS

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A pump as turbine (PAT) is a turbomachine that converts hydraulic energy into electricity. One of the study topics in PAT is the efficiency due to centrifugal pumps are not designed to operate in reverse mode. Geometric variations of the impeller have been studied in the literature. However, it was not possible to evidence the influence of the inclination of the blade leading and trailing edge. Therefore, the objective of this work is to analyze numerically and fluid dynamically the inclination angle of the blade leading and trailing edge of a centrifugal pump, in pump and turbine mode. First, the characteristic curve was validated. Then, the inclination of the leading and the trailing edge was modified, in a range of 25° to 90°, obtaining head, efficiency, and power graph. As a result, in pump mode was evidenced that an angle close to 90° on the blade trailing edge provides a higher efficiency of 50.26% and decreases until 40.77% when the angle approaches 30°, reducing the head to around 20%, while power remained constant. In turbine mode, an inverse effect was obtained, where the maximum efficiency was 60.9% and the generated power increased up to 4.76 kW in the blade leading edge. Therefore, the angular variation of the leading and the trailing edge is adequate in turbine mode, while in pump mode there is a loss of capacity.

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Section: State Of the Artmentioning

confidence: 85%

Influence of Leading and Trailing Edge Angle on Impeller Blades of a Pump as Turbine

Diego Penagos-Vasquez,

Jonathan Graciano-Uribe,

Luis Grisales-Noreña

et al. 2023

ARFMTS

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“…1. Hydroelectric capacity set up in the world at the end of 2017 [1] The big hydroelectric power plants are shown as the main electric supply source, representing since 2015 54% of world renewable energy total capacity, establishing itself as one of the proven, predictable and most profitable sources of renewable energy [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Reinforcement T-Joint Design and Structural Validation for a Hydroelectric Power Plant: Study Case

Río

Hernández

Quintana

et al. 2022

CFDL

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Branch pipe T-joints are used to connect and bifurcate hydraulic channels in big hydraulic power plants size. These components are submitted to enormous strengths that must be counteracted by integrated structures to the T-joint, for this case specified arrangement type "Nun neck". The main objective in this work is about validate structurally by numerical analysis the branch pipe T-joint design with reinforcement type “Nun Neck” to the operational established conditions in hydraulic channel design. The structural T-joint design was made following AISI Buried steel Penstocks and ASME section VIII Div. 1 standards. The simulation process was made by Multiphysics Simulation Software, Ansys Workbench V 17. The branch pipe T-joint CAD model is set as 1700 mm in diameter to flow and 1200mm to derivation. The computational simulation process was executed using the mechanical structure module in ANSYS Workbench V17.0 commercial version. The boundary conditions settings were established based on internal operational pressure given as 353.14 mWC and fixed restrictions in the areas of contact with the pipe. Equivalent Von Mises stress contours were determined looking to validate the stress state in branch T-joint, findings demonstrate that the proposed design has structural failures that must had been reinforced by civil works.

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Development of a Predicting Model for Calculating the Geometry and the Characteristic Curves of Pumps Running as Turbines in Both Operating Modes

2022

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This article is part of a scientific research project dedicated to the study of plants generating electricity from hydraulic sources by exploiting the technology of inverted flow centrifugal pumps, also known as PAT. The main purpose is to provide a contribution to the methodologies already existing in the literature, creating a one-dimensional model capable of predicting the characteristic curves of the machine, in both operating modes, without knowing its geometry. The first part of the work is therefore focused on the description of the fluid dynamic model, capable of determining the losses in the various sections of the machine, using different calculation approaches. The development of this model was carried out using a set of six centrifugal pumps, measured at the DIMEG Department of the University of Calabria and at the University of Trento. For this range of pumps, the characteristic curves were therefore obtained, both in pump and turbine operation. The second part of this work focuses on the description of the geometric model, useful as generally few data are provided in the manufacturer’s catalog, which is necessary for the correct installation of the machine. The geometric model can determine, using these parameters and through good design techniques and statistical diagrams, the entire geometry of the machine. This model refers to a pump prototype, having a simplified geometry, for which the characteristic curves of the PAT are obtained in pump operation. These curves are compared with those present in the manufacturer’s catalog, and if they show too high deviations, it is possible to act on some geometric parameters, chosen based on a sensitivity analysis. Once satisfactory results have been obtained, it is possible to obtain the characteristic curves also in turbine operation. This procedure has been finally applied to another PAT, taken as an example.

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Characterization of a Commercial Axial Flow PAT Through a Structured Methodology Step-by-Step

Cited by 3 publications

References 49 publications

Influence of Leading and Trailing Edge Angle on Impeller Blades of a Pump as Turbine

Influence of Leading and Trailing Edge Angle on Impeller Blades of a Pump as Turbine

Reinforcement T-Joint Design and Structural Validation for a Hydroelectric Power Plant: Study Case

Development of a Predicting Model for Calculating the Geometry and the Characteristic Curves of Pumps Running as Turbines in Both Operating Modes

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