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This research aims to compare the hydraulic performance of twisted-blade and flat-blade runners in a vertical ultra-low-head hydro turbine.

July 20, 2026Next EnergyOpen Access

Experimental comparison of runners with twisted and flat blades of a vertical-axis ultra-low-head hydro turbine for isolated low-scale power generation

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This research aims to compare the hydraulic performance of twisted-blade and flat-blade runners in a vertical ultra-low-head hydro turbine.
Experimental comparison conducted on a test rig under a design flow of 0.085 m³/s and a head of 0.5 m.
Outlet flow levels varied from 0 to 500 mm during testing.
The twisted blades were evaluated for efficiency against previously tested flat-blade runners.
Twisted blades achieved an efficiency of 57.27% at 97.8 RPM, outperforming flat-profile blades by 2.37%.
Maximum efficiency for both blade types was recorded at an outlet control of 450 mm.
The research highlights the importance of twisted blades and outlet control in optimizing VULHT.

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Randomized trial compares efficiency of twisted versus flat blades in small-scale hydropower applications, suggesting design improvements.

Chaulagain et al. (2026) studied this question.

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Randomized trial compares efficiency of twisted versus flat blades in small-scale hydropower applications, suggesting design improvements.