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CN-224225273-U - Accompanying flow compensation conduit before screw propeller

CN224225273UCN 224225273 UCN224225273 UCN 224225273UCN-224225273-U

Abstract

The application provides a propeller front accompanying flow compensation conduit, which comprises a connecting plate, a left half pipe and a right half pipe. Wherein, the front end of the connecting plate is fixedly connected with the stern. The upper edge of the left half pipe is fixedly connected with the left side of the connecting plate, and the lower edge is fixedly connected with the stern. The upper edge of the right half pipe is fixedly connected with the right side of the connecting plate, and the lower edge is fixedly connected with the stern. The front ends of the left half pipe and the right half pipe are respectively provided with a sawtooth-shaped structure, and the front edges of the propeller front accompanying flow compensation guide pipes are sawteeth. The front end of the left half pipe and the front end of the right half pipe jointly enclose a water inlet of the propeller front accompanying flow compensation conduit, the rear end of the left half pipe and the rear end of the right half pipe jointly enclose a water outlet of the propeller front accompanying flow compensation conduit, and water flows into a water flow channel in the propeller front accompanying flow compensation conduit from the water inlet and flows out from the water outlet. According to the technical scheme, the front edge saw teeth are arranged, so that the occurrence of flow separation can be delayed or inhibited, the inflow condition of the propeller is improved, and the working efficiency of the propeller is improved.

Inventors

  • LIN BOXING
  • FAN TAO
  • DAI KUN
  • WANG XIAOLONG
  • YUAN JING
  • Xie qianhui
  • WANG QINCHUN

Assignees

  • 江南造船(集团)有限责任公司

Dates

Publication Date
20260512
Application Date
20250611

Claims (10)

  1. 1. A propeller forward wake compensating duct, comprising: The front end of the connecting plate (1) is fixedly connected with the stern (5); The upper edge of the left half pipe (2) is fixedly connected with the left side of the connecting plate (1), and the lower edge of the left half pipe is fixedly connected with the stern (5); The upper edge of the right half pipe (3) is fixedly connected with the right side of the connecting plate (1), and the lower edge of the right half pipe is fixedly connected with the stern (5); The front end of the left half pipe (2) and the front end of the right half pipe (3) are provided with saw-tooth structures, and the saw-tooth structures form front edge saw teeth (4) of the propeller front accompanying flow compensation conduit together; the front end of the left half pipe (2) and the front end of the right half pipe (3) jointly enclose a water inlet (6) of the propeller front accompanying flow compensation conduit, the rear end of the left half pipe (2) and the rear end of the right half pipe (3) jointly enclose a water outlet (7) of the propeller front accompanying flow compensation conduit, and when the propeller front accompanying flow compensation conduit is used, water flows into a water flow channel (8) in the propeller front accompanying flow compensation conduit from the water inlet (6) and flows out from the water outlet (7).
  2. 2. Propeller front wake compensating duct according to claim 1, characterized in that in the leading edge serrations (4), the top of each serration is of planar configuration and the bottom of each serration is of planar configuration.
  3. 3. Propeller front wake compensating duct according to claim 1, characterized in that in the leading edge serrations (4), the top of each serration is of a peaked configuration and the bottom of each serration is of a planar configuration.
  4. 4. Propeller front wake compensating duct according to claim 1, characterized in that in the leading edge serrations (4), the top of each serration is of a peaked configuration and the bottom of each serration is of a planar configuration.
  5. 5. Propeller front wake compensating duct according to claim 1, characterized in that the cross section of the water flow channel (8) is tapered from front to back in the axial direction of the propeller shaft of the vessel.
  6. 6. Propeller pre-flow compensation conduit according to claim 1, characterized in that the pipe diameter of the left half pipe (2) is different from the pipe diameter of the right half pipe (3) at any cross section of the water flow channel (8).
  7. 7. The propeller front wake compensating duct according to claim 1, wherein the wall of the left half pipe (2) and the wall of the right half pipe (3) are both in a state of being thick in the middle and thin in both ends along the axis direction of the propeller shaft of the ship.
  8. 8. The propeller pre-accompanying-flow compensation conduit according to claim 1, characterized in that the angle between the plane of the water outlet (7) and the plane of the water inlet (6) is an acute angle, and the distance between the upper end of the water outlet (7) and the water inlet (6) is greater than the distance between the lower end of the water outlet (7) and the water inlet (6).
  9. 9. The propeller front wake compensating duct according to claim 1, characterized in that the central axis of the left half pipe (2) and the central axis of the right half pipe (3) respectively form an angle of 0-30 ° with the axis direction of the propeller shaft of the ship.
  10. 10. Propeller front wake compensating duct according to claim 1, characterized in that the front end of the connection plate (1) is provided with a notch for a fixed connection with the stern (5).

Description

Accompanying flow compensation conduit before screw propeller Technical Field The application relates to the field of ship construction, in particular to a propeller front accompanying flow compensation conduit. Background Nowadays, the emphasis on low-carbon energy conservation and green environmental protection concepts is increasing in the global scope, and ships are one of the main vehicles in the global transportation field, and the ships have huge fossil fuel consumption and can emit a large amount of pollutants such as greenhouse gases, so that the reduction of the fuel consumption of the ships has great significance. The propeller front accompanying flow compensation conduit is a common ship energy-saving device, is usually arranged at the position of the stern close to the tail shaft and is used for rectifying the stern accompanying flow, so that the forward incoming flow speed of the propeller is increased, the flow separation of the stern is reduced, the propeller propulsion efficiency is improved, the fuel consumption and carbon emission in ship navigation are reduced, the aims of saving energy and reducing emission are achieved, and the operation cost of the ship is effectively reduced. However, in the prior art, when the propeller front accompanying flow compensation conduit is designed, the flow field environment which is usually considered is ideal, in fact, in the sailing process of the ship, the ship has a change in aerostate, such as no load and full load, the water displacement of the propeller is different from that of the energy-saving device, the propeller and the energy-saving device are relatively close to the water surface when no load, and are easily influenced by sea waves, so that the energy-saving device deviates from the ideal condition considered in the design, such as larger incoming flow attack angle at the water inlet of the compensation conduit, flow separation is generated, the incoming flow condition of the propeller is poor, and the working efficiency is reduced. Particularly in extreme sea conditions (such as high seas and high waves), a large incoming flow attack angle is often generated at the water inlet of the compensating duct, and the existing compensating duct is not usually designed to take the factors into consideration, which further results in a great reduction in the actual working effect of the compensating duct. Therefore, the propeller front accompanying flow compensation conduit in the prior art has larger limitation in practical application, and can not well meet the energy-saving requirements of ships under various complicated sea conditions and different aviation states. Disclosure of utility model The embodiment of the application aims to provide a propeller front accompanying flow compensation conduit, which can delay or inhibit flow separation by arranging front edge saw teeth, effectively improve the inflow condition of a propeller and improve the working efficiency of the propeller. The application provides a propeller front accompanying flow compensation conduit which comprises a connecting plate, a left half pipe and a right half pipe. Wherein, the front end of connecting plate and stern fixed connection. The upper edge of the left half pipe is fixedly connected with the left side of the connecting plate, and the lower edge is fixedly connected with the stern. The upper edge of the right half pipe is fixedly connected with the right side of the connecting plate, and the lower edge is fixedly connected with the stern. The front end of the left half pipe and the front end of the right half pipe are both provided with saw-tooth structures, and the front edge saw teeth of the propeller front accompanying flow compensation conduit are formed together. The front end of the left half pipe and the front end of the right half pipe jointly enclose a water inlet of the propeller front accompanying flow compensation conduit, and the rear end of the left half pipe and the rear end of the right half pipe jointly enclose a water outlet of the propeller front accompanying flow compensation conduit. When in use, water flows into the water flow channel in the propeller front accompanying flow compensation conduit from the water inlet and flows out from the water outlet. In one embodiment, in the leading edge serrations, the top of each serration is planar and the bottom of each tooth slot is planar. In one embodiment, in the leading edge serrations, the top of each serration is of a peaked configuration and the bottom of each gullet is of a planar configuration. In one embodiment, in the leading edge serrations, the top of each serration is of a peaked configuration and the bottom of each gullet is of a planar configuration. In one embodiment, the cross section of the water flow passage is gradually reduced from front to rear along the axial direction of the propeller shaft of the ship. In one embodiment, the pipe diameter of the left half pipe is different fr