SU991226A1 - Device for testing main power plants of a ship afloat - Google Patents

Description

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The invention relates to shipbuilding and ship repair, and more specifically to devices 1fednnichnnym to simulate the mode of operation of the main power plants (GEM).

A device for testing main power plants of the afloat, containing a fixed rigidly from-, is known. in relation to the aft end of the vessel, a floating chamber with two horizontal flow directions, with annularly closed channels and a pipe supplying air to the working section of the said chamber l.15

The known device is designed to operate in it only one propeller, not limited to the sides by any other structures. For dvuhvintovyos ships it can not be and is used as due to the absence in the chamber of the working area for the propeller, tal and due to the small distance between the propeller shafts

ships that do not allow to place a test chamber for one of the screws. The flow in this device is found symmetrical about the axis of the 1-shaft propeller; which also doesn’t meet the conditions of the two-shaft vessels around the screws.

The purpose of the invention is to expand the field of application of the device and use it for testing two-shaft main power plants.

The goal is achieved by the fact that the rear wall of the chamber is connected to the front wall with the formation of a shaft for installing a rudder and two independent annularly closed channels, and a second pipe is placed in the device and the second section has a flow of gels in the upper wall perfection performed within the outer half of the shafina 1f molineyn1Х. their plots.

Claims (1)

On fvg. 1 shows the proposed device, a general view; on fng. 2 - the position of its elements relative to the test vessel. The device is equipped with a floating chamber 2 with two spaced horizontally and symmetrically with respect to the ship’s diametrical plane, ring-shaped and closed channels 3. Each of them contains a working section 4, which passes into the rear knee 5, followed by the reverse 6 connected to the front part of the working area with a forward swivel: Knee 7. In the front wall 8 of the knees 7, a notch 9 is made to enter the propeller shaft 10 from its bracket 11 1 rake screw 12. In the output section: The rail 7 is installed on a guide grate on the vertical blades 13, and on the inner side of the BHemaeik wall is a guide horizon (1 st | ribs 14. The upper wall 15 of the return channel 6 is perforated and a partition 16 is connected with the atmosphere above it. Pipe 17 with a flexible lower end 18 communicates with the working area 4, and the upper end with the atmosphere.The pipe 17 is equipped with a ventilation 19. Between the working areas 4 there is a shaft 20 in which the steering wheel 21 can be placed, the buoyancy compartments 22 are located in the corners of the device and in the center of each section.closed channel 3. The device operates as follows. The camera 2 is attached to the stern of the test vessel 1 and is rigidly fixed on it, while the ship’s steering wheel 21 is driven into the shaft 20, and the shafts 10 with their "Brackets and propellers 12 notches 9 are inserted into the working plots 4 cameras. The flexible end 18 of the tube: 17, when the screw passes through, is deflected to the side, and then, under the action of the elastic, their forces return to the working position. After that, chamber 2 1H) itashes before immersion under the free water noBepxHoqTb of canals 3, completely 3anc "HHeNifbtx with water through notches 9. I During the test, the GEM propeller 12 forms a FLOW in channel 3. The stream flows from working section 4 into the rear knee 5 and after having been raised there through the return channel 6 and the lower knee 7, follow again to the working section 4. If at a given rotation frequency of the propeller 12, the flow in the plane of the propeller 12 is less than during the vessel’s travel, the bottom screw 12 is not sufficiently unloaded, This is to ensure the load on the power plant oic characteristics opens valve 19 on a pipe 17 for supplying to the screw 12 outside. After the effect of aeration of the propeller 12 is realized, the emerging air puffs are removed from the flow through the perforations of the upper wall 15 of the return channel 6 and the enclosure 16 located on it to the atmosphere. The pressure and velocity pulsations from the propeller 12 are extinguished due to the diffusive effect of the rear knee 5 and the return channel 6. The twist to the development of flow heterogeneity is significantly limited by the guide bars 13 and the ribs 14, and the driving bevel of the flow is provided by the action of the bass walls of the working section. The buoyancy and stability of the chamber is transported before and after testing by compartments 22. Formula of the Invention A device for testing the main power plants of ships afloat, containing a floating chamber fixed rigidly relative to the stern tip of the vessel with two horizontal flow-guiding channels with closed channels and a supply pipe air into the working area of said chamber, characterized in that, in order to expand the field of application of the device and use it for testing The two-shaft main power installations, the back wall is connected to the front wall of the chamber with the formation of a shaft for installing a rudder and two independent annularly closed channels, 15) The second pipe is led into the device to ensure independent air leaks into the working area, this The upper wall of the flux-guiding channels is made with perforations within the outer half of the cord-1 run of straight lines (sections. Sources of information taken into account during the examination 1. GDR patent No. 122055, cl. 63 N 5/16, 1976 (prototype). - GL 9ot.t fff FIG. 2 / 22