Effects of changing the number of pump blades of both rotor and stator on the characteristics of flow pattern and waterjet propulsion performances are principally investigated in this paper, which includes the changes of rotor's blades from 5 to 7 to the effect of Stodola slip factor, of stator's vanes from 9 to 13 to the effect of straightening the outflow of impeller, and of both rotor and stator's blade numbers simultaneously. It shows that, given the condition of fixed pump revolution and vessel speed, the Stodola slip factor, the head, axial-thrust and brake power are all incline as the number of rotor's blades increase, but the efficiencies decline; the circumferential velocity of the nozzle outflow weakens with the increase of number of stator's vanes, but the improvement is approximately unchangeable when it comes to 11. The waterjet performances are close when the stator's vanes are 10 and 11, both of their head and axial-thrust are bigger than that of with 12 or 13 stator's vanes; The waterjet optimum propulsion performances can obtained when 5 blades of rotor match 9 vanes of stator, while the rotor blades are 6 or 7, the best number of stator's vanes both are 11, but the 7 blades and 11 vanes combination presents a better cavitaion performances.
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