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%