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Water-jet propeller rectifying body

A technology of fluid and rectifying blades, which is applied in the direction of ship propulsion, propulsion components, ship components, etc., can solve the problems of frequent faults of impellers and rectifying blades, ship stall, cavitation and denudation, etc., so as to facilitate engineering realization and reduce manufacturing costs Effect

Pending Publication Date: 2020-06-26
韩玉军
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] Usually, these rectifying blades have a helical structure with a certain deflection angle. When the impeller speed reaches 900 r / min or more, severe cavitation and erosion will occur on the back of the rectifying blade angle of attack, and impeller and rectifying blade failures occur frequently. Caused a significant drop in thrust and a sudden stall of the ship

Method used

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  • Water-jet propeller rectifying body
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Embodiment Construction

[0013] figure 1 and figure 2 The shown rectifying body includes: a blade hub (1), whose shape is a curved cone; a group of several rectifying blades (2), whose cross-section is an elongated water drop shape (3) composed of multiple curves. Among them, the diameter ratio of the rectifying blade along the axial direction between the outflow and the inflow is between 0.43-0.78 (4), which plays the role of straightening the jet flow and increasing the axial force.

[0014] The rectifying blade (2) has 5-17 elongated drop-shaped cross-sections distributed along the axial circumference, as shown in Figure (3). The elongated drop-shaped shape helps to improve hydrodynamic efficiency and reduce flow field disturbance, thereby delaying or eliminating cavitation and erosion.

[0015] The fairing body is suitable for any waterjet propeller. The installation and operation of the rectifier is as follows: the rectifier is placed in the stator nozzle at the rear end of the pump impeller ...

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Abstract

The invention relates to the key technical field of ship water-jet propellers, and aims to eliminate cavitation and denudation and improve the power conversion efficiency and efficiency of a water-jetpropeller. Moreover, an engineering manufacturing method is reconstructed at the same time, so that the industrial implementation of the water-jet propeller is remarkably improved, and the cost structure of the water-jet propeller is further improved. The engineering effect that can be realized is as follows: the rectification body blade of the water jet propeller is designed into a multi-curve section perpendicular to the axial direction, so that cavitation and denudation are delayed to 8300 r / min of the rotating speed of the impeller. A water-jet propeller rectifying body provided by the invention comprises a rectifying body wheel hub and several rectifying blades. According to a model test result, the cavitation and denudation delay of the water-jet propeller adopting the rectifying body technology is increased to 8300 r / min or above from 900 r / min compared with a known water-jet propeller, and the effect is increased by 15-30% in the aspect of propulsion efficiency characteristics; and no denudation fault occurs in the whole life cycle.

Description

technical field [0001] The present invention relates to the key technical field of ship water jet propulsion, aiming to eliminate cavitation and denudation, generate as large axial force as possible, and improve the efficiency and effectiveness of power conversion of water jet propulsion; at the same time, rebuild the engineering manufacturing method, The industrialization implementation of the water jet propeller is significantly improved, and the cost structure of the water jet propeller is further improved. Background technique [0002] Now, the water jet propulsor utilizing jetting principle is widely used, and is mainly used in motor boats, speedboats, landing craft, patrol boats, torpedoes, submersibles and submarines. To generate powerful jets, these systems employ hydraulic generators, mixed flow pumps, such as axial flow pumps with a shaft and impellers. [0003] A known waterjet propeller of US Patent No. 5871381 has a special stator (straightener) for straighteni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63H11/08
CPCB63H11/08B63H2011/081
Inventor 韩玉军
Owner 韩玉军