Prerotation fan-shaped conduit for right-handed single-screw ship

A fan-shaped and duct-shaped technology, which is applied in the direction of rotating propellers and rotary propellers, can solve the problems of low propulsion efficiency of the propeller, uneven follow-up flow, fatigue, etc., and achieve the goal of reducing the wet surface area, stabilizing the structure, and strengthening the pre-rotation effect Effect

Inactive Publication Date: 2014-05-07
SHANGHAI MERCHANT SHIP DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy-saving devices currently used include pre-rotating fins, pre-rotating fins plus full ducts, and Mewis Duct, etc., but the existing devices have problems such as low propeller propulsion efficiency and uneven wake.
After improvement, although a three-leaf pre-rotated triangular duct is used, there are still problems in strength, fatigue and vibration.

Method used

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  • Prerotation fan-shaped conduit for right-handed single-screw ship
  • Prerotation fan-shaped conduit for right-handed single-screw ship
  • Prerotation fan-shaped conduit for right-handed single-screw ship

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Embodiment Construction

[0028] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] According to the characteristics of hull follow current calculated by CFD or measured by ship model test and the direction of propeller rotation, a pre-swirl triangular duct with completely asymmetric arrangement in front of the propeller installed at the stern of a medium-low speed ship is invented to improve the propulsion efficiency and evenly accompany the propeller. flow, reducing the risk of hull vibration.

[0030] like figure 1 , figure 2 The shown pre-rotating fan-shaped duct for a right-handed single-screw ship is located between the propeller 20 at the stern and the hull 21. Viewed from the rear side of the propeller 20, the stern on the left side of the propeller hub longitudinal centerline is from top to bottom. The second blade 12 and the first blade 11 are arranged below, and the stern on the right sid...

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Abstract

The invention discloses a prerotation fan-shaped conduit for a right-handed single-screw ship. The prerotation fan-shaped conduit comprises a first vane, a second vane, a third vane, a fourth vane and an arc guide plate; from the rear side of a screw propeller, the left side of a longitudinal central line of a screw impeller hub is sequentially provided with the second vane and the first vane from top to bottom, the right side is sequentially provided with the third vane and the fourth vane from top to bottom, an angle formed between the first vane and the longitudinal central line of the screw impeller hub is 70 to 80 degrees, an angle formed between the second vane and the longitudinal central line of the screw impeller hub is 25 to 30 degrees, an angle formed between the third vane and the longitudinal central line of the screw impeller hub is 35 to 45 degrees, and an angle formed between the fourth vane and the longitudinal central line of the screw impeller hub is 70 to 80 degrees. Compared with the three-vane prerotation triangular conduit, the third vane plays a role in supporting and reinforcing the prerotation and is also arranged outside an air bubble sensitive area, and the adverse impact on the air bubble performance can be avoided.

Description

technical field [0001] The invention relates to the hull energy-saving equipment technology of a right-handed single-screw ship, and more specifically relates to a pre-swirl fan-shaped duct used for a right-handed single-screw ship. Background technique [0002] During the use of right-handed single-screw ships, research at home and abroad has realized that changing the direction of the propeller inflow can improve the propulsion efficiency of the propeller and achieve the effect of energy saving. The energy-saving devices currently used include pre-rotating fins, pre-rotating fins plus full ducts, and Mewis Duct, etc., but the existing devices have problems such as low propulsion efficiency of the propeller and uneven wake. After improvement, although a three-leaf pre-rotated triangular catheter is used, there are still problems in strength, fatigue and vibration. Contents of the invention [0003] Aiming at the defects existing in the prior art, the object of the presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63H1/28
Inventor 周志勇王刚毅程宣恺陆琛亮
Owner SHANGHAI MERCHANT SHIP DESIGN & RES INST
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