Evaluation of energy loss in a low-head axial flow turbine under different blade numbers using entropy production method

Ohiemi, Israel Enema; Yang, Sun-Sheng; Singh, Punit; Li, Yanjun; Osman, Fareed Konadu

doi:10.1016/j.energy.2023.127262

Cited by 17 publications

(3 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For future investigations, it is essential to further explore the effect of blade number on hydraulic performance for turbines equipped with stator guide vanes, as our results differ from those reported by Ohiemi et al, [35].…”

Section: Discussioncontrasting

confidence: 87%

“…Nonetheless, the authors did not report the diameter of the turbine, which is paramount for comparison purposes. Ohiemi et al, [35] sought to analyze the effect of the blade number on total energy loss and turbulent dissipation by quantifying internal entropy production. The experimental and numerical study used a 219 mm diameter axial turbine with stator guide vanes.…”

Section: Blade Number Effect Studiesmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Section: Discussioncontrasting

confidence: 87%

Section: Blade Number Effect Studiesmentioning

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

View full text Add to dashboard Cite

show abstract

“…In the first decade of the twentieth century, scholars used the entropy production theory to analyze concerns in laminar and turbulent flow [22][23][24]. Since then, an increasing number of scholars have relied on entropy production theory to investigate the process mechanism and fluid flow state in specific types of hydraulic machinery for performance optimization, energy dissipation of flow, and flow characteristic [25][26][27][28]. Furthermore, hydraulic losses of Francis turbines were studied using the entropy production analysis, and the benefit in determining the quantity of energy dissipation and the site where the dissipation hap-pens was concluded.…”

Section: Introductionmentioning

confidence: 99%

The impact of blade inlet angle (β₂) influence on pump‐as‐turbine performance by using entropy production theory

Fordjour,

Dwomoh,

Otuboah

et al. 2024

The Journal of Engineering

View full text Add to dashboard Cite

The effect of the blade inlet angle on the pump‐as‐turbine (PAT) has not been adequately investigated. The hydraulic performance of PAT was analyzed using an available test rig. The accuracy of the numerical data was established by the comparative analysis of the experimental data. The study demonstrated that as the blade inlet angle increases, so does hydraulic performance, but only to a certain degree. The required pressure head and the shaft power increased with the increase in blade inlet angle. As compared to the volute and outlet pipe, the hydraulic power loss within the impeller accounts for a large portion of the total power loss. The impeller power loss decreases and increases at low and high flow rates, respectively, as the blade inlet angle increases. The fluid angle of attack decreases as the blade inlet angle increases at high flow, allowing the impeller power loss to drop and performance to increase. To visualize PAT internal energy loss, the distribution of the variable of pressure, velocity, and entropy dissipation theory was applied. The impeller had the highest energy loss of the PAT geometrical parameters. The shock loss, flow separation, and asymmetric volute structure are the primary causes of impeller loss. The unsteady simulation results showed that rotor–stator interaction greatly influences the gap between the volute tongue and the impeller tip. The research results provide a reference for the design of the PAT.

show abstract

Flow irreversibility and heat transfer effects on turbine efficiency

Inhestern,

Peitsch,

Paniagua

2024

Applied Energy

View full text Add to dashboard Cite

Evaluation of energy loss in a low-head axial flow turbine under different blade numbers using entropy production method

Cited by 17 publications

References 61 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

The impact of blade inlet angle (β₂) influence on pump‐as‐turbine performance by using entropy production theory

Flow irreversibility and heat transfer effects on turbine efficiency

Contact Info

Product

Resources

About

Evaluation of energy loss in a low-head axial flow turbine under different blade numbers using entropy production method

Cited by 17 publications

References 61 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

The impact of blade inlet angle (β2) influence on pump‐as‐turbine performance by using entropy production theory

Flow irreversibility and heat transfer effects on turbine efficiency

Contact Info

Product

Resources

About

The impact of blade inlet angle (β₂) influence on pump‐as‐turbine performance by using entropy production theory