Development of correlation for the power coefficient of the hybrid hydrokinetic turbine rotor having straight-bladed Darrieus and helical-bladed Savonius rotors

A hybrid rotor can self-start on its own with better performance than a single hydrokinetic turbine rotor. This makes the hybrid rotor employable to tap the available potential of flow in rivers and canals. Given that, an extensive numerical investigation has been carried out to enhance the performa...

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Bibliographic Details
Published in:Journal of the Brazilian Society of Mechanical Sciences and Engineering 2024-03, Vol.46 (3), Article 136
Main Authors: Kamal, Md. Mustafa, Singal, S. K., Abbas, Ali
Format: Article
Language:English
Subjects:
Correlation
Data points
Engineering
Flow velocity
Mechanical Engineering
Nomograms
Numerical analysis
Regression coefficients
Rotors
Technical Paper
Turbines
Water flow
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Summary:A hybrid rotor can self-start on its own with better performance than a single hydrokinetic turbine rotor. This makes the hybrid rotor employable to tap the available potential of flow in rivers and canals. Given that, an extensive numerical investigation has been carried out to enhance the performance of the hybrid hydrokinetic turbine rotor. The influence of Savonius helical-bladed angle, radius ratio and attachment angle on the performance characteristics of the hybrid rotor has been studied under different operating conditions. Based on the computed power coefficient for the hybrid rotor, a correlation has been developed for the power coefficient with different system and operating parameters. The values of the power coefficient obtained from the developed correlation and numerical analysis are compared and found that 95% of data points lie within ± 14% which shows the good agreement of predicted values with numerical values. The value of the regression coefficient ( R 2 ) for developed correlation is obtained as 0.97. Moreover, the mean absolute deviation value in the predicted power coefficient is obtained as 6.2%. The nomograms have also been developed based on correlation to design a prototype of a hybrid hydrokinetic turbine under different water flow velocities.
ISSN:1678-5878
1806-3691
DOI:10.1007/s40430-024-04713-4