A fast measuring device for ship water flow in experimental harbor

Abstract

The invention discloses a device for quickly measuring the water flow force of a ship in an experimental harbor basin, which includes a plurality of support rods, which are vertically arranged in the experimental harbor basin, pulleys are installed on the tops of the support rods, and flow isolation is provided on the liftable suspension on the pulleys. The flow isolator is sleeved on the outside of the support rod through a pulley. A ship model is arranged in the area surrounded by the support rods, a guide rail is vertically arranged on the ship model, a rotator that can drive the guide rail to rotate is installed on the top of the guide rail, and the rotator is fixedly connected with the support rod. A pressure sensor is installed on the ship model, and a current meter and a wave height meter are arranged in the area surrounded by the flow isolator, and the pressure sensor, the current speed meter and the wave height meter are all connected to the computer. The present invention can realize fast stillness of the internal flow field through the lifting and lowering of the flow isolator, improve the test efficiency and accuracy, and fully consider the influence of terrain and water level changes on the ship's water flow force, and provide for ship line design and wharf mooring design. A fast and effective test comparison scheme was established.

Description

technical field [0001] The invention belongs to the field of ships and marine engineering, in particular to the field of testing the resistance performance of ships, in particular to a fast measuring device for ship water flow in an experimental harbor. Background technique [0002] The water flow force of a ship refers to the force generated by water on the part below the waterline of the hull. It can be divided into transverse water flow force and longitudinal water flow force with the change of the flow direction angle. The underwater upstream surface of the hull directly determines the change trend of its water flow force. The empirical formula of water flow force given in the code can not meet the accuracy of ship design and the change of shape line of new ships gradually. In the traditional test method, the ballast and draft are often determined first, and the ship is fixed on the measuring table, but this ignores the influence of water level changes on the underwater ...

AI Technical Summary

Problems solved by technology

However, in the traditional hydrodynamic test carried out in the towed pool, the water body is still, which is inconsistent with the hydrokinetic conditions of the fluid in the actual situation, and it takes a long time to wait for the water surface to be still, which reduces the test efficiency

In addition, the towing pool cannot consider the influence of the terrain on the fluid disturbance, especially in the dock mooring test, it is difficult for the aircraft to arrange numerous crash pads and mooring points

[0004] When conducting tests in the experimental harbor basin, the traditional method usually needs to use graphite to mark the rotation angle on the foundation, or use expansion screws to fix the marking line as a reference for changing the flow direction, but the angle of marking is often limited in use. , and the phenomenon of water scouring and refraction will inevitably affect the test accuracy, and even cause damage to the foundation

When changing the test working conditions, it is necessary to zero the instrument under still water conditions. Due to the large area of ​​the pool, it takes a lot of time to wait for the water surface to calm down, which limits the test efficiency and accuracy.

At present, the existing instruments and equipment cannot provide a fast test device and method for calculating the water flow force of the ship in the experimental harbor basin, which brings difficulties and challenges to the simulation of the real sea conditions and the characteristics of the water flow force of the ship under different corners of the terrain.

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