Floating craft

 

The invention relates to shipbuilding and the construction of self-propelled vessels. Floating tool includes a housing with sides and pozdneevoi channel of variable cross-section. This channel is installed propulsion. Pozdneevoi channel floating means is formed of flat plates arranged along the flow of water. This channel is equipped with cavitators placed in the junction plates. This cross section of the channel along its length are U-shaped. The craft corners mutual fracture of adjacent plates in the aft and fore parts of the channel may not exceed 14o. The technical result of the invention is to reduce the friction and eddy resistance vessels by changing the shape of the bottom and podymalovo channel. 1 C.p. f-crystals. 3 Il.

The invention relates to shipbuilding and the construction of self-propelled vessels.

Known floating tool (patent 2013306, the IPC 63 N 5/16, Appl. 16.11.90, publ. 30.05.94, BI 10), comprising a housing with a flat vertical sides and podnimim channel of variable cross section, which houses the propulsion. Pozdneevoi channel in this floating tool performed smoothly varies is this, at least one of the propulsion units placed in the area of the channel cross section. Performing channel tapering in the Central part, as well as the location of minimum cross-section of the channel of the thruster allows you to create additional water velocity, thereby decreasing or completely destroyed by the fluctuations of the velocity and pressure in the water around the tool during its movement. This allows you to partially or completely eliminate the wave and vortex components of water resistance to the movement of the vessel, especially when driving in shallow water and narrow rivers and canals, and thus increase its propulsion.

A disadvantage of the known construction is that due to the increased flow rate of water through the channel increases the frictional resistance in the channel that does not exclude the possibility of the emergence of vortex drag at the stern and the bow of the channel.

The main task of the author when creating the invention is to reduce the frictional drag and vortex drag at the expense of changing the shape of the bottom and podymalovo channel.

This object is achieved in that in the design of the craft, comprising a housing with sides and pozdneevoi channel of variable cross-section with installed the cavitators, placed in the junction plates. This cross section of the channel along its length are U-shaped. In addition, the mutual angles of the fracture adjacent plates in the aft and fore parts of the channel do not exceed the 14o. Source Reference book on theory of the ship, so 1, below. Ed. I. I. of Waitmessage. - Leningrad: Sudostroenie, 1985 , A. N. Ivanov. Hypodynamia developed cavitation flows. - Leningrad: Sudostroenie, 1980, and A. M. Latisana. Basics of hydraulics. - L.: Gidrometeoizdat, 1971 ) it is known that an effective way of reducing the friction resistance is creating along the streamlined surface stable thin air layer - artificial caverns, which separates the flow of water from the solid boundaries (air lubrication, "ventilation").

The introduction of flat plates in the channel, you can create along the underwater part of the sail craft a thin layer of air, the so-called "grease", and thus significantly reduce the friction. The introduction of the cavitator, in particular wedge-shaped, allows the best way to solve the problem, in particular to separate by creating a cavity the flow of water from the solid boundaries. For this cavitators installed across the flow of water in the junction plates. There serves horyzontalny plates and a smaller on inclined and vertical plates and racks. The length of the cavity should be proportional to the square of the speed of water flow, which makes this method particularly advantageous in the channel, where the water velocity is considerably higher than the speed of the vessel. Quite one or two of the cavitator to ventilate the entire channel, because the effect is due to the difference between the friction resistance plate covers and the resistance of the cavitator.

Irrotational flow around a flat plate at the stern and the bow of the channel is possible only if the angles relative differences (break) adjacent along the water flow flat plate (angles "C" in Fig.1 and 2) will not exceed 10-20o.

The invention is illustrated by drawings, where Fig.1 shows a vessel, a horizontal section of the vessel in the underwater part of the channel of Fig.2 - average longitudinal diametrical section; Fig.3 - average cross section.

Floating means includes a housing 1 with a flat outer walls 2 and a bottom 3 and pozdneevoi channel 4. Pozdneevoi channel 4 are closed on top of the entire length of the tool under water, and is the length of three parts: tapering 5 (confuser), prismatic 6 and 7 expanding (diffuser).

All cationically to the outer sides 2, form two stem 8 and two aftershave 9.

The upper edge of the inlet and outlet of the channel are not located below the cargo waterline.

On the walls of the channel 4, the outer flanges 2 and the bottom 3 are cavitators, which bring air or exhaust gases from the engines. In places the butt of fractures of flat plates forming the bottom part of the housing 1, cavitators. The specific shape and dimensions of all elements of the housing 1 and channel 4 in each case is determined depending on the specified mode, speed and operating conditions of the tool.

In the confuser 5 channel 4 are hydraulic thrusters, the number of which is also determined depending on the mode of speed means, with at least one of the propellers is located in an area of minimum cross-section of the channel 4.

Work is carried out as follows.

Enabling propulsion 10 last expanded water channel 4. Due to the appearance in the channel 4 additional water velocities caused by the work of drivers, significantly reduced the fluctuations of the velocity and pressure in the water around means during movement of the latter at a given speed. This is due to the fact that the velocity of the water along the Bor is jut wave generation on the surface of the water, because the channel is closed from the top throughout its length.

It is known that the variations of the velocity and pressure cause the formation of vortices and waves on the water when the vessel traffic and accordingly vortex and wave resistance of the water to the movement of vessels that reach 75% of the total drag, especially in shallow and narrow waters.

Calculations show that with this design craft its full water resistance without installation of the cavitator is 80% of the resistance of friction, of which 50% is the frictional resistance of horizontal plates, prismatic part of the channel and the bottom, which can be reduced by the installation of the cavitator, i.e., the total resistance will be mainly from the drag of the hull and of the cavitator.

Thus, using the proposed forms and designs that will allow you to set the cavitators, will enable significant reduction of water resistance to the movement of funds by reducing all its components: the wave, vortex and friction. This, in turn, will further significantly reduce the capacity of the power plant, the specific fuel consumption per unit of path cost;">Claims

1. Floating tool, comprising a housing with sides and pozdneevoi channel of variable cross-section defined therein propulsion, characterized in that pozdneevoi channel floating means is formed of flat plates arranged along the flow of water and have cavitators placed in the junction of the plates, while the cross section of the channel along its length are U-shaped.

2. Floating craft under item 1, characterized in that the mutual angles of the fracture adjacent plates in the aft and fore parts of the channel do not exceed the 14o.

 

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