Research Article

Performance Study of Modified Savonius Water Turbine with Two Deflector Plates

Table 1

Summary of experimental investigation carried out by researchers on Savonius turbines with water as working medium.

AuthorTurbine aspect ratio ( )Reynolds number × 105Free stream velocity (m/s)Water tunnel dimensions (m × m)Orientation of the axisTurbines testedParameters measuredResults

Khan et al. [9]1.820.98, 1.52, 1.961 VerticalSingle-stage, two-stage, three-stage conventional Savonius turbines with an overlap ratio of 0.207Cp, Ct of 0.038, 0.049, and 0.04 for single-, two-, and three-stage Savonius turbines

Nakajima et al. [10]1.481.10.8 HorizontalSingle-stage conventional Savonius turbineCp, flow visualisation of 0.25 for single-stage Savonius turbine

Nakajima et al. [11]1.2, 2.41.10.8 HorizontalSingle-stage and two-stage conventional Savonius turbine with an overlap ratio of 0.36Cp, 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

Golecha et al. [12]0.701.320.45 VerticalSingle-stage, two-stage and three-stage modified Savonius turbine with and without deflector plateCp, Ct 50% improvement in the for single-stage modified Savonius with deflector plate at optimal position