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Pumpjet hydraulic model with flow distribution short blades, and design method

A hydraulic model and design method technology, applied in design optimization/simulation, instruments, calculations, etc., can solve problems such as unfavorable counterweight, increased longitudinal bending moment of the stern, and increased axial length of pump jets, etc., to promote popularization and application, The effect of small advancing speed coefficient and high anti-cavitation performance

Active Publication Date: 2017-06-23
NAVAL UNIV OF ENG PLA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Scheme ②, the inducer increases the axial length of the pump jet, which leads to an increase in the longitudinal bending moment of the stern, which is unfavorable to the counterweight

Method used

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  • Pumpjet hydraulic model with flow distribution short blades, and design method
  • Pumpjet hydraulic model with flow distribution short blades, and design method
  • Pumpjet hydraulic model with flow distribution short blades, and design method

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] A pump-jet propeller hydraulic model with split short blades 2, such as figure 1 As shown, a duct 6 is included, and a front impeller and a rear stator are coaxially arranged in the duct 6. The impeller includes an impeller hub 3, and impeller main blades 1 and splitter short blades 2 uniformly arranged along the circumference of the impeller hub 3. The impeller The main blade 1 and the short shunt blades 2 have a side slope angle, and the side slope degree of the side slope angle is 50%; the stator includes a stator hub 5 coaxially arranged with the impeller hub 3, and uniformly arranged along the stator hub 5 circumferential The stator blade 4 , the blade tip of the stator blade 4 is connected to the inner wall surface 14 of the duct 6 . The impeller main blade 1, splitter short blade 2 and stator blade 4 all adopt NACA 16 airfoil thickness di...

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Abstract

The invention discloses a pumpjet hydraulic model with flow distribution short blades, and a design method. The pumpjet hydraulic model comprises impeller main blades, an impeller hub, impeller flow distribution short blades, stator blades, a stator hub, and a guide pipe. A thrust load ratio of the impeller main blades to the flow distribution short blades is 3 to 2. The flow distribution short blades and the main blades are same in number, a single short blade is circumferentially located between the two adjacent main blades, the flow distribution short blades and the main blades are same in axial position of following edge, and a ratio of the average diameter of guide edges to the diameter of a pumpjet inlet is 0.63. The impeller main blades and the flow distribution short blades all have high-skew characteristics. According to the pumpjet hydraulic model, cavitation generation can be delayed, cavitation resistance can be improved, radiation noises can be reduced, and working characteristics of small advance coefficient and easiness in cavitation generation when a pumpjet is used for an auxiliary propeller can be adapted. The technical measures are also suitable for design of a hydraulic model when a shaftless driven integrated motor pumpjet is used as the auxiliary propeller.

Description

technical field [0001] The invention belongs to the technical field of ship propellers, and in particular relates to a hydraulic model and a design method of a pump-jet propeller with split short blades. Background technique [0002] Pumpjet propulsion (Pumpjet, referred to as pumpjet) has been widely used in the main propulsion of low-noise submarines, such as "Seawolf-class" submarines and "Virginia-class" submarines, due to its remarkable characteristics of low radiation noise and high critical speed. At present, the United States, the United Kingdom, France and Russia have all applied the pump-jet propulsion technology to the main propulsion of submarines. The main reason why there is no pump-jet propulsion submarine in service in China is the lack of excellent pump-jet hydraulic models. The specific meaning of excellent is: low radiation noise, high critical speed (that is, strong anti-cavitation ability), and moderate propulsion efficiency. In order to achieve this in...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20Y02T90/00
Inventor 杨琼方王永生刘彦森
Owner NAVAL UNIV OF ENG PLA
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