Waterjet propulsion ships have the characteristics of high speed,shallow draft and superior turning performance.In this paper,for the bare hull and the hull with four jet pumps,planar motion mechanism(PMM)model tests are carried out in a tank,such as the oblique motion,sway motion,yaw motion,and free running model test,to obtain the hull hydrodynamic force and nozzle flow;Thirdly,the least square method is used to obtain the hydrodynamic derivatives through regression analysis.The mathematical models based on Abkowitz and MMG model are established,and the maneuvering motion program of the waterjet propulsion ship is developed.The 30 ° turning test and 10 °/10 ° zigzag test are simulated.The numerical simulation results show that the error of the tactical diameter is within 5.5％using MMG and Abkowitz models,that the error of the first overshoot angle is about 2 ° by using the MMG model,both of which are in good agreement with the free running model test results.By comparison,the model test or CFD numerical calculation related to the Abkowitz model is more difficult and costly.In practical engineering numerical simulations,numerical simulations based on MMG model are also easier to implement.
Waterjet propulsionManeuverabilityAbkowitz modelMMG model
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NSTL
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