The analysis of waterjet units. Discussion

In recent years application of the waterjet principle to large high-speed vessels has caused the size of the individual units to increase considerably from the small units used in the leisure industry, to a point where they are driven by multi-diesel engine and gas turbine systems. Design and classification approval of such units require knowledge of the forces acting on the primary components: the rotor, stator, pump bowl, inlet duct, nozzle exit and reversing bucket. A programme of research has been undertaken by Lloyd's Register over the past two and a half years to develop advanced analysis methods for such units. These methods provide an independent capability to assist in both plan approval and technical investigation activities. This paper describes the methodologies behind the primary hydrodynamic and structural modules developed within this project.