Research Article
Study on the Interaction between Two Hydrokinetic Savonius Turbines
Table 1
Summary of experimental investigation carried out by researchers on Savonius turbines with water as working medium.
| | Author | Turbine aspect ratio (H/D) | Reynolds number ×105 | Free stream velocity (m/s) | Water tunnel dimensions () | Orientation of the axis | Turbines tested | Parameters measured | Results |
| | Khan et al. [8] | 1.82 | 0.98, 1.52, 1.96 | 1 | 5 × 3 | Vertical | Single-stage, two- stage, three-stage conventional Savonius turbines with an overlap ratio of 0.207 | , | of 0.038, 0.049 and 0.04 for single-, two- and three-stage Savonius turbines |
| | Nakajima et al. [9] | 1.48 | 1.1 | 0.8 | 0.6 × 0.5 | Horizontal | Single-stage conventional Savonius turbine | , flow visualisation | of 0.25 for single-stage Savonius turbine |
| | Nakajima et al. [10] | 1.2, 2.4 | 1.1 | 0.8 | 0.6 × 0.5 | Horizontal | Single-stage and two-stage conventional Savonius turbine with an overlap ratio of 0.36 | , flow visualisation | of 0.275 for two stage with 90° phase shift compared to 0.25 for single-stage turbine and flow visualisation gives the torque generation mechanism |
| | Faizal et al. [11] | 4.54 | No details available | 0.2 | 0.45 × 0.3 | Vertical | Single-stage conventional Savonius five-bladed turbine | , | Rotational speed of the turbine increases with increase in the wave height and wave frequency |
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