Experimental and Numerical Investigation of Pressure Fluctuation in a Low-Specific-Speed Centrifugal Pump with a Gap Drainage Impeller

Table 3

Comparison of hydraulic performance of different schemes.

Flow rate	Schemes	Head H (m)	Efficiency η (%)
0.6Qd	Original model	84.7	19.8
	Model 1	81.51	19.91
	Model 2	79.14	20.26
1.0Qd	Original model	82.5	26.7
	Model 1	79.16	26.98
	Model 2	76.86	27.1
1.4Qd	Original model	80.6	32.3
	Model 1	76.88	33.51
	Model 2	74.87	33.56