Research Article
Investigation of Blade Number Effect on Hydraulic Performance of In-Pipe Hydro Savonius Turbine
Table 3
Grid number vs. efficiency for all turbines.
| Level number | 1 | 2 | 3 | 4 |
| Grid number | 2-bladed turbine | 1.5 | 2.8 | 5.1 | 7.6 | Efficiency | 19.22 | 16.01 | 14.15 | 14.12 | Torque change | - | 7.51% | 2.39% | 1.29% | Flow rate change | - | 4.9% | 3.21% | 1.86% |
| Grid number | 3-bladed turbine | | | 5.3 | 7.9 | Efficiency | | | 22.10 | 22.09 | Torque change | | | - | 1.72% | Flow rate change | | | - | 1.96% |
| Grid number | 5-bladed turbine | | | 5.6 | 8.2 | Efficiency | | | 28.15 | 28.14 | Torque change | | | - | 1.29% | Flow rate change | | | - | 1.67% |
| Grid number | 8-bladed turbine | | | 5.8 | 8.8 | Efficiency | | | 26.41 | 26.41 | Torque change | | | - | 1.11% | Flow rate change | | | - | 1.37% |
| Grid number | 10-bladed turbine | | | 6.2 | 9.5 | Efficiency | | | 24.66 | 24.66 | Torque change | | | - | 1.02% | Flow rate change | | | - | 1.16% |
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