Numerical Research on Effects of Splitter Blades to the Influence of Pump as Turbine

Table 4

Amplitude of frequency domain and MPF at impeller monitoring points (see Figures 9(a), 9(b), and 9(c)).

Items	Frequency	6/(6)	7/(7)	8/(8)
Without splitter (a)	8.33 Hz	6018.02	11049.18	2256.43
	16.67 Hz	1649.96	2377.97	281.91
	33.33 Hz	2255.83	4226.27	1600.46
	41.67 Hz	2872.05	3407.42	1617.94
	MPF	8.05	11.47	4.34
With splitter (b)	8.33 Hz	7445.42	3633.10	164.20
	16.77 Hz	2417.61	2764.29	645.44
	33.33 Hz	2466.57	3954.63	1000.15
	41.67 Hz	2674.59	2972.82	458.17
	MPF	8.55	7.58	2.02
With splitter (c)	8.33 Hz	7195.57	1958.94	424.43
	16.77 Hz	2589.07	909.47	756.64
	33.33 Hz	2413.62	3585.52	1085.72
	41.67 Hz	2313.00	2206.07	617.10
	MPF	8.59	6.75	2.30