Numerical and experimental study of hydrofoil-flap arrangements for hydrokinetic turbine applications

Aguilar, Jonathan; Velásquez, Laura; Romero, Fredys; Betancour, Johan; Rubio-Clemente, Ainhoa; Chica, Edwin

doi:10.1016/j.jksues.2021.08.002

Cited by 2 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 1 shows that the Eppler hydrofoil family is of great research interest and that the Cp found varies between 0,27 and 0,42. This is supported by the results of this work, whose experimental finding coincides with Abutunis et al (2020), while the numerical one agrees with Aguilar et al (2021). Finally, it is highlighted that the numerical Cp between 0,33 and 0,51 are higher than the experimental ones between 0,27 and 0,45, this study being conclusive as to the cause of the difference.…”

Section: Resultssupporting

confidence: 87%

Numerical and experimental performance analysis of a horizontal axis hydrokinetic turbine

Betancur Gómez,

Ardila Marín,

Chica Arrieta

2023

JART

View full text Add to dashboard Cite

Alternative technologies such as hydrokinetic turbines can improve the electric energy conditions in rural or non interconnected areas with a low environmental impact. However, as they are an emergent device they must be studied further to better understand their phenomenology a nd the ways to improve their performance. The numerical and experimental evaluation of rotors under specific operation conditions depending on their hydrodynamic profiles result in efficiency curves for evaluated prototypes, so that devices are proposed which take full advantage of the flow conditions of a specific place. Considering the above, the main objective of this work was to numerically and experimentally evaluate a horizontal axis hydrokinetic turbine rotor prototype with an EPPLER E817 hydrodyna mic profile for a flow velocity of 1.4 m s 1 The simulations were carried out by means of computational fluid dynamics; the k ? SST turbulence model was used, and the torque was monitored. Then, the Grid Convergence Index ( was calculated to establish the results’ numerical uncertainty. For experimentation, the rotor was additively manufactured and tested in a test bench, where tests at velocity of nearly 1,4 m s 1 were performed and the braking voltage was varied to measure torque at different tip speed ratio (TSR Finally, the experimental and numerical curves of power coefficient ( versus TSR were compared Both the simulation and experimental results show th at a TSR of about 4 represents the best operating conditions, but, due to mechanical losses in the experimental setup, the reported Cp values differ between a numerical 0.4 34 and an experimental 0.2 67 The power generated by the evaluated rotor could achie ve 117.0 W, thus showing the potential of this technology for electrical power supply with low environmental impact.

show abstract

Section: Resultssupporting

confidence: 87%

Numerical and experimental performance analysis of a horizontal axis hydrokinetic turbine

Betancur Gómez,

Ardila Marín,

Chica Arrieta

2023

JART

View full text Add to dashboard Cite

show abstract

“…It is mounted on the central shaft with a clearance from the bottom of the tank C = T /3. This impeller was used as a reference for the comparison of the new impellers with the flanges added resembling a slat on the leading edge of an airfoil. , These profiles have been named using the prefix “M” and are the following: M3 (short leading edge) and M4 (long leading edge). Figure shows the different blade profiles tested in this work.…”

Section: Methodsmentioning

confidence: 99%

Effect of Modified Impellers with Added Leading Edges Flanges on Pumping Efficiency in Agitated Tanks

Mendoza-Escamilla

Rivadeneyra-Romero

Yáñez-Varela

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In this work, a modification in the blade profile of the classic PBT turbine has been proposed by adding flanges on the leading edges with the purpose of analyzing the hydrodynamic performance and its effects on the reduction of energy consumption. The hydrodynamic characteristics and mixing performance of the modified PBT were evaluated in a standard baffled tank. Experimental measurements by PIV and CFD simulations were used to assess the effect of flanges added to the blade profile on power consumption, pumping efficiency, and their correlation with the pressure drag form. The hydrodynamic effect of the flanges was analyzed using pressure coefficients and local pressure gradient, both evaluated on the leading and trailing faces of the blades. Mixing parameters such as power number, pumping number, pumping efficiency, and mixing time were assessed. The proposed flanges have a substantial effect on the delay of the flow separation and reduction of the recirculating region in the rear edge of the blade. These effects are related to pressurization in the rear blade surfaces, which in turn reduces the energy needed to overcome drag as the impeller rotates, and, therefore, power consumption. In addition, as the flow energy is redirected by the flanges, the pumping is improved and the mixing time is shortened. The highest power reduction reached with the flange models was 12.5%, and the highest increase in the pumping was 6.4%. Moreover, the maximum increase in pumping efficiency achieved with these modified profiles was 31.3%, and a maximum decrease in mixing time of 11.2% was observed.

show abstract

Numerical and experimental study of hydrofoil-flap arrangements for hydrokinetic turbine applications

Cited by 2 publications

References 39 publications

Numerical and experimental performance analysis of a horizontal axis hydrokinetic turbine

Numerical and experimental performance analysis of a horizontal axis hydrokinetic turbine

Effect of Modified Impellers with Added Leading Edges Flanges on Pumping Efficiency in Agitated Tanks

Contact Info

Product

Resources

About