Improvement of the Efficiency of the Axial-Flow Pump at Part Loads due to Installing Outlet Guide Vanes Mechanism

Table 2

Adjustable angles of outlet guide vane and performance of pumping system.

Flow rate coefficient	Head coefficient	OGV		Setting angles θ/(°)	Torque (N·m)	Efficiency/(%)
		Suitable angle; β/(°)	Fixed angle; β/(°)
0.521	0.541	59.64	64.8	−5.16	77.825	83.55
0.552	0.458	63.31	64.8	1.49	72.081	80.79
0.664	0.171	68.53	64.8	3.73	40.360	60.96