Abstract
ABSTRACT This research proposes a front straight guide vane (FSGV) to suppress pre-rotation before the waterjet pump, forming a double guide vane (DGV) with the rear guide vane (RGV). To verify its effectiveness, the hydrodynamic characteristics are studied numerically. The simulated external characteristic curve is consistent with the experimental result. The parameter optimisation of FSGV is processed. The result shows that FSGV can improve the adverse inflow pattern significantly and is beneficial to the hydrodynamic characteristics, and the propulsion performance is improved significantly with the increasing blade length and the axial gap. In addition, when the rotating speed is less than 3.29 times the design rotating speed, the influence on the cavitation performance by the DGVs in the impeller can be ignorable. However, the cavitation grows worse if the rotating speed increases far outweighing the design rotating speed, at which the propulsion pump never operates.
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