Experiments and Numerical Simulation of Performances and Internal Flow for High-Speed Rescue Pump with Variable Speeds

Figure 15

Frequency spectrum of pressure-augmented coefficient in impeller with different rotation speeds.

(a) 3000 rpm

(b) 3600 rpm

(c) 4200 rpm

(d) 4800 rpm

(e) 5400 rpm

(f) 6000 rpm