Maneuverability hydrodynamic testing device and testing method of hydrojet propelled ship model

Abstract

The invention discloses a maneuverability hydrodynamic testing device and a testing method of a hydrojet propelled ship model. The testing device comprises planar motion mechanism, wherein the planarmotion mechanism is fixed on a pool trailer and used for testing a hull hydrodynamic force of the hydrojet propelled ship model; the hydrojet propelled ship model comprises a bare hull model, hydrojetpropulsion devices, a hydrojet propulsion device control system, dynamic testers and a parallel acquisition system; the hydrojet propulsion devices are symmetrically arranged at the rear part of thebare hull model and used for providing a propulsion force to the bare hull model; the hydrojet propulsion device control system is connected with the hydrojet propulsion devices; the dynamic testers are arranged at the front parts of the hydrojet propulsion devices and used for measuring rotating speeds, propulsion forces and torques of propeller shafts of the hydrojet propulsion devices; and theparallel acquisition system is connected with the dynamic tester and used for acquiring the rotating speeds, the propulsion forces, the torques and the hull hydrodynamic force. The device is concise in structure; components are divided clearly; the testing method is reasonable; and a hydrodynamic derivative of the hydrojet propelled ship model by the action of certain water flow jet can be obtained accurately.

Description

technical field [0001] The invention relates to the technical field of ship performance testing, in particular to a hydrodynamic test device for maneuverability of a water jet propulsion ship model. Background technique [0002] At present, there are more and more ships with a speed exceeding 40kn, so the requirements for the propulsion device are put forward, that is, to achieve high propulsion efficiency in the high-speed range. In the high-speed range, water-jet propulsion has unique advantages, which not only enable high-speed ships to achieve high propulsion efficiency, but also enable them to have better maneuverability. When studying the maneuverability of water-jet propulsion ship models, the hydrodynamic force of ship models is often tested by cantilever tanks or PMM (Planar Motion Mechanism). The content of the ship model maneuverability test of the cantilever tank is relatively limited, and it cannot fully solve the problem of solving the hydrodynamic derivative ...

AI Technical Summary

Problems solved by technology

When using PMM to carry out the hydrodynamic test of the maneuverability of the water jet propulsion ship model, in the past, only the hydrodynamic force of the naked hull without the jet pump can be tested, and then the water jet flow rate and the water jet thrust generated by the jet pump and the thrust of the propeller inside the pump can be tested separately. The influence of the interaction between them is not considered. Therefore, the hydrodynamic derivative obtained by using PMM to test the bare hull of the waterjet propulsion model may have a large deviation from the actual situation. In order to obtain more reliable waterjet propulsion For the hydrodynamic derivative of the ship, it is urgent to develop a hydrodynamic test device for the maneuverability of the water jet propulsion ship model PMM water jet propulsion ship model considering the coupling effect of the jet pump and the hull

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