Numerical Analysis of a Propeller Turbine Operated in Part Load Conditions

Junginger, Bernd; Riedelbauch, Stefan

doi:10.1007/978-3-319-68394-2_21

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…This model was designed to give highly accurate predictions of the amount of flow separation under adverse pressure gradients. The 𝑘 − 𝜔 𝑆𝑆𝑇 turbulence model has been used by several studies for turbomachinery simulations with satisfactory precision when comparing with experimental results [40][41][42][43].…”

Section: Methodology 21 Governing Equations and Turbine Performance P...mentioning

confidence: 99%

Influence of Blade Number on the Hydrodynamic Performance of a Propeller-Type Axial Turbine for In-Pipe Installation

Oscar Monsalve,

Sebastián Velez-Garcia,

Josept David Revuelta-Acosta

2024

CFDL

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In-pipe hydraulic turbines are a promising energy-harvesting technology. Recent studies have demonstrated a strong influence of the turbine blade number on the performance of an axial propeller-type turbine. However, limited research has been dedicated to turbine diameters less than 100 mm. Therefore, this research aimed to determine the effect of the number of blades on the hydrodynamic performance of a 75.3 mm diameter axial propeller turbine for in-pipe installation. A parametric numerical study was performed by varying the angular velocity from 1600 to 3800 rpm and the number of blades from 2 to 6. Results identified an inverse correlation between the hydraulic efficiency of the turbine and its blade number and a direct correlation between the pressure head and the turbine torque. Furthermore, the performance showed hydraulic behavior comparable to those found in literature, confirming a similar hydraulic behavior as turbines with diameters exceeding 100 mm. Additionally, the turbine’s internal flow behavior was analyzed by visualizing the vortex structure using the Q-criterion. Lastly, this study provides a deeper understanding of the effect of the number of blades on the hydrodynamic performance of an axial turbine for in-pipe installation.

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Section: Methodology 21 Governing Equations and Turbine Performance P...mentioning

confidence: 99%

Influence of Blade Number on the Hydrodynamic Performance of a Propeller-Type Axial Turbine for In-Pipe Installation

Oscar Monsalve,

Sebastián Velez-Garcia,

Josept David Revuelta-Acosta

2024

CFDL

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POD analysis of a vortex rope with transient boundary conditions

Urban

Rudolf

2019

IOP Conf. Ser.: Earth Environ. Sci.

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The paper presents the results of a POD analysis of the flow in a swirl generator. The generator has two separate inlets – one straight axial inlet and one tangential inlet ended by a spiral case. This allows to set different operating points, which are in turn connected with different shapes of the vortex rope present in the flow field. In this case, the investigation is aimed at linearly varying flow rates at the boundaries, namely, the ratio of the tangential flow rate is increased from 40 % up to more than 80 % of the total flow rate, which is maintained constant. Substituting the POD modes into the energy equation provides additional insight into the energy fluxes between the modes and consequently into a major part of the turbulent flow energy cascade as the input data were gained from a CFD simulation using scale-resolving Stress-Blended Eddy Simulation model. The POD modes can be used to construct a simplified model of the vortex rope dynamics covering a wider operating range rather than just one point.

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Fluid-Structure Numerical Study of an In-Pipe Axial Turbine with Circular Blades

Monsalve-Cifuentes,

Vélez-García,

Sanín-Villa

et al. 2024

Energies

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Hydraulic turbines have become indispensable for harnessing renewable energy sources, particularly in-pipe hydraulic turbine technology, which leverages excess energy within pipeline systems like drinking water distribution pipes to produce electrical power. Among these turbines, the propeller-type axial turbine with circular blades stands out for its efficiency. However, there is a notable lack of literature on fluid dynamics and structural behavior under various operational conditions. This study introduces a comprehensive methodology to numerically investigate the hydraulic and structural responses of turbines designed for in-pipe installation. The methodology encompasses the design of circular blades, followed by parametric studies on fluid dynamics and structural analysis. The circular blade’s performance was evaluated across different materials, incorporating static, modal, and harmonic response analyses. Results showed that the circular blade achieved a peak hydraulic efficiency of 75.5% at a flow rate of 10 l/s, generating 1.86 m of head pressure drop and 138 W of mechanical power. Structurally, it demonstrated a safety factor exceeding 1 across the entire hydraulic range without encountering resonance or fatigue issues. This research and its methodology significantly contribute to advancing the understanding of designing and assessing the fluid dynamic behavior and structural integrity of circular blades in axial propeller-type turbines for in-pipe installations, serving as a valuable resource for future studies in similar domains.

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Numerical Analysis of a Propeller Turbine Operated in Part Load Conditions

Cited by 3 publications

References 12 publications

Influence of Blade Number on the Hydrodynamic Performance of a Propeller-Type Axial Turbine for In-Pipe Installation

Influence of Blade Number on the Hydrodynamic Performance of a Propeller-Type Axial Turbine for In-Pipe Installation

POD analysis of a vortex rope with transient boundary conditions

Fluid-Structure Numerical Study of an In-Pipe Axial Turbine with Circular Blades

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