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Pump jet propeller model with Helmholtz resonant cavities and design method thereof

A resonant cavity and thruster technology, which is applied in ship design, design optimization/simulation, instruments, etc., can solve problems such as difficult and limited resonant cavity volume, reduce total noise, reduce low-frequency discrete line spectrum noise, and facilitate extended effect

Active Publication Date: 2017-07-14
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of the structural strength requirements of the catheter itself, it is impossible to achieve a large-scale hollow inside, resulting in a limited volume of the resonant cavity that can be used, and it is difficult to achieve extremely low-frequency noise reduction within 30 Hz

Method used

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  • Pump jet propeller model with Helmholtz resonant cavities and design method thereof
  • Pump jet propeller model with Helmholtz resonant cavities and design method thereof
  • Pump jet propeller model with Helmholtz resonant cavities and design method thereof

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Experimental program
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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, the pre-stator pump-jet propeller model with the Helmholtz resonance cavity designed by the present invention includes a conduit 5, and a coaxial impeller and a stator are arranged in the conduit 5, the stator is in the front, and the The impeller is placed behind; the impeller includes impeller blades 3 and impeller hub 4, and the impeller blades 3 are circumferentially symmetrically fixed to the impeller hub 4; the stator includes stator blades 1 and stator hub 2, and the stator blades 1 are fixed to the stator The hub 2 and the tip of the stator vane 1 are fixed on the inner wall of the duct 5; the internal rib structure of the duct includes annular ribs 6 and longitudinal ribs 7, the annular ribs 6 are initially arranged at equal intervals in the axial direction, and the longitudinal ribs 7 are arranged unevenly in the circumferential direction; two parallel resonance cavities The Helmholtz resonator 8 is located in front of the first ring...

Embodiment 2

[0057] The flow chart of the design method of the pre-stator pump spray model with the Helmholtz resonance cavity designed by the present invention is as follows Figure 4 as shown,

[0058] In step S1, the hydraulic parameters of the pump jet fluid channel are selected and designed according to the design requirements. When selecting and designing, according to the theory of ship water jet propulsion, the five parameters of pump jet cascade channel head, flow rate, outlet area, specific speed and suction specific speed are determined according to the rapidity requirements.

[0059] Step S2, determine the two-dimensional axial projection geometry of the pump spray front stator, rear impeller, and inner and outer walls of the duct; the two-dimensional axial projection geometry includes the leading edge and trailing edge of the stator blade, the stator hub, the leading edge and the trailing edge of the impeller blade , the axial projection of the impeller hub, the inner and out...

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Abstract

The present invention discloses a pump jet propeller model with Helmholtz resonant cavities, and a design method thereof. The pump jet propeller model comprises a conduit, a front stator, an impeller, a ring rib and a longitudinal rib that are arranged inside the conduit, a Helmholtz resonator with two parallel resonant cavities arranged at the inner front end of the conduit, and a Helmholtz resonator with two parallel neck portions arranged at the inner rear end of the conduit. The resonant frequency of the front resonator is the pump jet blade frequency and 2 times blade frequency, and the resonant frequency of the rear resonator is the 2 times pump jet blade frequency. Compared with the reference pump water jet model, the hydrodynamic performance of the pump jet model with the Helmholtz resonant cavities is basically the same, and the spectral noise at the blade frequency and 2 times blade frequency is reduced by 2-3dB. The number of stator blades is 11 leaves, the number of impeller blades is 9 leaves, and the impeller blades have large lateral slope characteristics, and can be used as the main propeller with the speed of 16 knots, the thrust of 300kN and the power of 3.5MW. According to the technical scheme disclosed by the present invention, pump jet low-frequency spectral noise can be further prohibited, and total noise can be further reduced; and the muffler technical scheme can be applied to the spectral noise optimization design of the non-axis drive integrated motor pump water jet model.

Description

technical field [0001] The invention belongs to the technical field of ship propellers, and in particular relates to a pump-jet propulsor which has the characteristics of low line spectrum noise and high critical speed and can be used to propel underwater submersibles. Background technique [0002] Pumpjet propulsion (Pumpjet, referred to as pumpjet) has been widely used in the main propulsion of low-noise submarines, such as the "Seawolf-class" submarines, "Virginia-class" and "Agility class" submarine. 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 excellence is: low radiation noise, high critical speed (that is, strong anti-cavitation ability), moderate propulsion efficiency (a design method for a hydrauli...

Claims

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Application Information

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IPC IPC(8): G06F17/50B63B9/00
CPCB63B71/00G06F30/15G06F30/17G06F30/20G06F30/23Y02T90/00
Inventor 杨琼方王永生刘彦森
Owner NAVAL UNIV OF ENG PLA
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