A previously developed numerical panel method has been refined, and extended to predict the hydrodynamic performance of a rotor inside a water-jet pump. The governing equations and boundary conditions on the water-jet rotor are formulated and solved by distributing constant dipoles and sources on blades, hub and shroud surfaces, and constant dipoles on the shedding wake sheets behind the trailing edge of the rotor. The algorithm of finding the correct discrete cavity shape on every section of the blade is initiated with a guessed cavity plan-form, and the cavity extent and thickness are determined iteratively until both the dynamic and kinematic boundary conditions are satisfied within a set criterion on the cavity surface. The present method is validated against the experimental data in the case of an actual water-jet pump (ONR AxWJ-2). The predicted numerical results such as thrust and torque coefficients as well as cavity patterns are compared with those from the measurements and observation.
Numerical method for the analysis of cavitating waterjet propulsion systems
2012
7 Seiten, 13 Bilder, 22 Quellen
Conference paper
Storage medium
English
Waterjet propulsion system and watercraft having a waterjet propulsion system
European Patent Office | 2020
|British Library Conference Proceedings | 1993
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