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Pre-rotation triangular conduit for right-handed rotation single screw vessel

A triangular and conduit technology, applied in the direction of rotating propellers, rotary propellers, etc., can solve the problems of uneven wake and low propulsion efficiency of propellers, and achieve the effects of reducing wet surface area, facilitating processing and positioning, and easy strength

Active Publication Date: 2013-10-02
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.

Method used

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  • Pre-rotation triangular conduit for right-handed rotation single screw vessel
  • Pre-rotation triangular conduit for right-handed rotation single screw vessel
  • Pre-rotation triangular conduit for right-handed rotation single screw vessel

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Embodiment Construction

[0024] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] 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.

[0026] Such as figure 1 , figure 2 The shown one is used for the pre-swirl triangular duct of a right-handed single-screw boat, which is arranged between the propeller 20 at the stern and the hull 21, and is characterized in that:

[0027] The pre-swirling triangular duct of the present invention is fan-shaped. Seen from the rear side of the propeller 20, the stern on the left side of the longitudinal cent...

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Abstract

The invention discloses a pre-rotation triangular conduit for a right-handed rotation single screw vessel. The pre-rotation triangular conduit has a fan-shaped structure; seen from the rear side of a screw propeller, a second blade and a first blade are arranged from top to bottom on the left side of a longitudinal central line of a propeller hub of the screw propeller, and a third blade is arranged on the right side; a blade back of a guide plate is fixedly connected with a blade tip of the first blade, a blade tip of the second blade and a blade tip of the third blade respectively; the included angle range of the first blade and the longitudinal central line of the propeller hub of the screw propeller is 70-75 degrees; the included angle range of the second blade and the longitudinal central line of the propeller hub of the screw propeller is 25-30 degrees; and the included angle range of the third blade and the longitudinal central line of the propeller hub of the screw propeller is 70-75 degrees. By using the principle of pre-rotation before the propeller and screw propeller upper inlet flow acceleration, the pre-rotation triangular conduit is a piece of body energy saving equipment with more uniform inlet flow of the screw propeller disk; and importantly, the energy lost due to rotation of a wake flow field of the screw propeller is reduced, the screw propeller propulsive efficiency is improved and the additional form resistance due to tail flow separation is reduced.

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 triangular conduit 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. Contents of the invention [0003] Aiming at the defects existing in the prior art, the object of the present invention is to provide a pre-swirl triangular duct for a right-handed single-screw ship, which not only reduces the energy lost due to rotatio...

Claims

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Application Information

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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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