阅读说明：本技术 一种轴流式双涵道喷水推进器 (Axial-flow type double-duct water jet propeller ) 是由 陈泰然 鲁航 黄彪 张富毅 耿昊 尹昕鑫 于 2021-02-10 设计创作，主要内容包括：本发明涉及一种轴流式双涵道喷水推进器,属于流体机械工程、船舶推进领域。本发明的目的是为了解决现有轴流式喷水推进器扬程低的问题,所述推进器,由支架、外涵道传动轴、进水流道、外涵道叶轮室、外涵道导叶室、喷口,外涵道叶轮轮毂、外涵道叶轮叶片、外涵道导叶叶片、内涵道传动轴、内涵道叶轮轮毂,内涵道导叶轮毂、内涵道叶轮室、内涵道导叶室、内涵道叶轮叶片、内涵道导叶叶片、法兰盘组成。该装置在保证大流量的前提下,可以提高喷水推进器的扬程,改善抗空化性能,使得轴流式喷水推进器可以应用到高速航行体推进,同时轴流式双涵道喷水推进器避免了多级喷水推进器重量大、空间尺寸大等缺点。(The invention relates to an axial-flow double-duct water jet propeller, belonging to the field of fluid mechanical engineering and ship propulsion. The invention aims to solve the problem of low lift of the existing axial-flow water jet propeller, and the propeller consists of a bracket, an outer culvert transmission shaft, a water inlet flow channel, an outer culvert impeller chamber, an outer culvert guide vane chamber and a nozzle, an outer culvert impeller hub, an outer culvert impeller blade, an outer culvert guide vane blade, an inner culvert transmission shaft and an inner culvert impeller hub, an inner culvert guide vane hub, an inner culvert impeller chamber, an inner culvert guide vane chamber, an inner culvert impeller blade, an inner culvert guide vane blade and a flange plate. The device can improve the lift of the water jet propeller and improve the anti-cavitation performance on the premise of ensuring large flow, so that the axial-flow type water jet propeller can be applied to high-speed navigation body propulsion, and meanwhile, the axial-flow type double-duct water jet propeller avoids the defects of large weight, large space size and the like of a multistage water jet propeller.)

1. The utility model provides a two duct water jet propulsion ware of axial-flow type which characterized in that: the device comprises a bracket, an outer culvert transmission shaft, a water inlet flow channel, an outer culvert impeller chamber, an outer culvert guide vane chamber, a nozzle, an outer culvert impeller hub, outer culvert impeller blades, outer culvert guide vane blades, an inner culvert transmission shaft, an inner culvert impeller hub, an inner culvert guide vane hub, an inner culvert impeller chamber, inner culvert guide vane chambers, inner culvert impeller blades, inner culvert guide vane blades and a flange;

the support is arranged in the ship, and the bottom of the support is fixedly connected with the ship body through bolts to play a role in supporting and fixing the pipeline;

the outer culvert transmission shaft is fixedly connected with an outer culvert impeller hub;

the water inlet flow channel is fixedly connected with the bracket through bolts and is connected with the outer culvert impeller chamber through a flange plate;

the outer ducted impeller chamber is of an equal-diameter circular tube structure and is connected with the water inlet flow channel and the outer ducted guide vane chamber through bolts;

the outer ducted guide vane chamber is of an equal-diameter circular tube structure and is connected with the outer ducted impeller chamber and the nozzle through bolts;

the nozzle is in a diameter reducing pipe structure and is connected with the outer duct guide vane chamber through a bolt, and the nozzle has the function of converting the pressure energy of water flow into kinetic energy and improving the injection speed;

the outer culvert impeller hub and the outer culvert impeller blade are rotating parts and are positioned inside the outer culvert impeller chamber, the outer culvert impeller blade is fixed on the outer culvert impeller hub through a nut and a positioning pin, and the outer culvert impeller hub is fixedly connected with an outer culvert transmission shaft;

the outer ducted guide vane blade is positioned in the outer ducted guide vane chamber, is fixedly connected with the outer ducted guide vane chamber through welding, is fixedly connected with the inner ducted impeller chamber through a nut and a positioning pin, and is used for eliminating the circumferential speed of water flow;

the inner culvert transmission shaft is fixedly connected with the outer culvert impeller hub and the inner culvert impeller hub;

the inner culvert impeller hub and the inner culvert impeller blades are rotating parts and are positioned in the inner culvert impeller chamber, mechanical energy input by the inner culvert transmission shaft is converted into fluid energy through the rotation of the blades, the inner culvert impeller blades are fixed on the inner culvert impeller hub through nuts and positioning pins, and the inner culvert impeller hub is fixedly connected with the inner culvert transmission shaft.

2. The axial-flow type double-duct water jet propeller of claim 1, wherein: the size of the blade is obtained by the following method:

designing an inner pump blade based on a discrete vortex lattice method; under the condition of giving radial and chordwise distribution of the ring vector, a plurality of control points are arranged on the surface of the initial blade, and iterative calculation is carried out through the resultant speed obtained by the formula (3) until the object plane boundary condition of the blade arch cambered surface is met, so that the final shape of the blade arch cambered surface is determined, and the initial shape of the blade is finally determined;

firstly, dividing M intervals on an initial surface along a radial direction, and dividing N grids along a chord direction; then, arranging a control point at the core of each grid, arranging a line source and a spanwise vortex at 1/4 chord lengths, arranging a chordwise vortex on a chordwise connecting line of the spanwise vortex end point, and setting the induced velocity of a vortex system on the control point:

wherein: (i, j) is a control point; (m, n) is a load point; k is the number of leaves; gamma-shaped_nm ^sIs the spanwise vorticity; gamma-shaped_nm ^cChord vortex strength; gamma-shaped_nm ^tWake vortex intensity; gamma-shaped_tipTip vortex strength; gamma-shaped_hubHub vortex strength;

the induction speed of the source system on the control band is as follows:

wherein: q_nmIs the strength of the source sink; k^Q _ijnmkThe influence coefficient of the line source element on the Kth blade is shown; the resultant velocity at the (i, j) th control point in the flow field is:

wherein: k^Q _ijnmkThe influence coefficient of the line source element on the Kth blade is shown; q_nmIs the strength of the source sink;

and (3) arranging a plurality of control points on the surface of the initial blade, and performing iterative calculation through the resultant velocity obtained by the formula (3) until all the control points on the blade meet the boundary condition of an object plane with the total found velocity equal to zero, so as to obtain the final shape of the blade.

3. The operating method of the axial flow type double-duct water jet propeller as claimed in claim 1, wherein: water flow enters the water jet propeller through the water inlet and is guided to the outer culvert impeller chamber through the water inlet flow channel, the outer culvert transmission shaft drives the outer culvert impeller blades to do work in a rotating mode, the pressure energy and the kinetic energy of the water flow are improved, a part of the water flow eliminates circumferential velocity components through the outer culvert guide vane blades, a part of the water flow passes through the inner culvert impeller blades, the pressure energy generated by the outer culvert impeller is added to the part of the incoming flow, the cavitation resistance of the inner culvert impeller blades is favorable, the pressure energy and the kinetic energy are further improved through the rotating work of the inner culvert impeller blades, the circumferential velocity components are eliminated through the rectifying effect of the inner culvert guide vane blades, the two parts of the water flow are converged in the nozzle, a part of the pressure energy is converted into the kinetic energy through the nozzle, and finally the kinetic energy is sprayed out to generate thrust.

Technical Field

The invention relates to an axial-flow double-duct water jet propeller, belonging to the field of fluid mechanical engineering and ship propulsion.

Background

The water jet propeller is a special propulsion mode different from a propeller, and generally comprises four parts, namely a water inlet flow channel, a water jet propulsion pump, a nozzle and a reversing device. The water inlet channel is a component for guiding water flow from the bottom of the ship to the inlet of the water jet propulsion pump, the propulsion pump is a core acting component of the water jet propulsion pump and is used for converting the rotating mechanical energy of a prime motor into kinetic energy, pressure energy and potential energy of the water flow, the nozzle is used for converting the pressure energy of the water flow into the kinetic energy, the water flow is ejected at a higher speed, and the reversing device is used for changing the jet flow direction to realize steering and reverse navigation of the ship or other carriers. The water jet propeller utilizes the reaction force of the ejected high-speed water flow to push a ship or other carriers to advance on the water surface or under the water. Compared with a propeller, the water jet propeller has the advantages of high propelling efficiency, strong cavitation resistance, low vibration noise, strong working condition adaptation capability, simple transmission mechanism and the like, and is widely applied to navigation bodies such as ships, amphibious vehicles, submarines and the like.

The propulsion pump is a main body part of the water jet propeller, and the water jet propeller is mainly divided into an axial flow type water jet propeller and a mixed flow type water jet propeller according to the difference of the types of the propulsion pump. The axial-flow water-jet propeller has the characteristics of large flow and low lift, and the mixed-flow water-jet propeller has the characteristics of small flow and high lift. The thrust equation and the energy balance equation of the water jet propeller are respectively shown in the formulas (1) and (2),

T＝ρQ(V_j-αV₀) (1)

wherein rho is the water flow density; q is the volume flow; v_jAnd V₀Respectively, the jet velocity and the incoming flow velocity; alpha is a boundary layer influence coefficient; k is a radical of_jIs the spout loss factor; k₁Loss factors including pipeline losses (including water inlet and spout losses); h is_cThe height is raised for the water level. According to the thrust equation, the thrust is in direct proportion to the flow, and the large thrust requires largeThe axial-flow water jet propeller is ideal in terms of thrust, but the jet speed of a high-speed ship nozzle is high, the jet loss is large, the lift of the propeller pump is required to be high, so that the axial-flow pump can meet the requirements only by multistage series connection, and a series of problems in the aspects of arrangement, weight and the like are brought. Therefore, the axial-flow type water jet propeller is mostly used on a navigation body with low navigation speed, and the application range is small.

Through the research of documents, relevant patents related to the double-duct water jet propeller are discovered at present. Aiming at the problem of low lift of the existing axial flow type water jet propeller, the invention provides the axial flow type double-duct water jet propeller which can simultaneously realize high lift on the premise of ensuring high flow.

Disclosure of Invention

The invention aims to solve the problem of low lift of the existing axial-flow type water-jet propeller, and provides an axial-flow type double-culvert water-jet propeller which can improve the lift of the water-jet propeller on the premise of ensuring high flow, so that the axial-flow type water-jet propeller can be applied to high-speed navigation body propulsion, and meanwhile, the axial-flow type double-culvert water-jet propeller avoids the defects of heavy weight, large space size and the like of a multistage water-jet propeller. The invention can be applied to the technical fields of ships, amphibious vehicles, submarines and underwater vehicles.

The purpose of the invention is realized by the following technical scheme:

an axial-flow type double-duct water jet propeller comprises a support, an outer duct transmission shaft, a water inlet flow channel, an outer duct impeller chamber, an outer duct guide vane chamber, a nozzle, an outer duct impeller hub, outer duct impeller blades, outer duct guide vane blades, an inner duct transmission shaft, an inner duct impeller hub, an inner duct guide vane hub, an inner duct impeller chamber, an inner duct guide vane chamber, inner duct impeller blades, inner duct guide vane blades and a flange plate.

The support is arranged in the ship, and the bottom of the support is fixedly connected with the ship body through bolts to play a role in supporting and fixing the pipeline;

the outer culvert transmission shaft is fixedly connected with an outer culvert impeller hub;

the water inlet flow channel is fixedly connected with the bracket through bolts and is connected with the outer culvert impeller chamber through a flange plate;

the outer ducted impeller chamber is of an equal-diameter circular tube structure and is connected with the water inlet flow channel and the outer ducted guide vane chamber through bolts;

the outer ducted guide vane chamber is of an equal-diameter circular tube structure and is connected with the outer ducted impeller chamber and the nozzle through bolts;

the nozzle is in a diameter reducing pipe structure and is connected with the outer duct guide vane chamber through a bolt, and the nozzle has the function of converting the pressure energy of water flow into kinetic energy and improving the injection speed;

the outer culvert impeller hub and the outer culvert impeller blade are rotating parts and are positioned inside the outer culvert impeller chamber, the outer culvert impeller blade is fixed on the outer culvert impeller hub through a nut and a positioning pin, and the outer culvert impeller hub is fixedly connected with an outer culvert transmission shaft;

the outer ducted guide vane blade is positioned in the outer ducted guide vane chamber, is fixedly connected with the outer ducted guide vane chamber through welding, is fixedly connected with the inner ducted impeller chamber through a nut and a positioning pin, and is used for eliminating the circumferential speed of water flow;

the inner culvert transmission shaft is fixedly connected with the outer culvert impeller hub and the inner culvert impeller hub;

the inner culvert impeller hub and the inner culvert impeller blades are rotating parts and are positioned in the inner culvert impeller chamber, the mechanical energy input by the inner culvert transmission shaft is converted into the energy of fluid through the rotation of the blades, the inner culvert impeller blades are fixed on the inner culvert impeller hub through nuts and positioning pins, and the inner culvert impeller hub is fixedly connected with the inner culvert transmission shaft;

designing an inner pump blade based on a discrete vortex lattice method; under the condition of giving radial and chordwise distribution of the ring vector, a singular point system is arranged on the surface of the initial blade, iterative calculation is carried out by the singular point system until the boundary condition of the object plane of the blade arch cambered surface is met, the final shape of the blade arch cambered surface is further determined, and the initial shape of the blade is finally determined.

Firstly, dividing M intervals on an initial surface along a radial direction, and dividing N grids along a chord direction; then, arranging a control point at the core of each grid, arranging a line source and a spanwise vortex at 1/4 chord lengths, arranging a chordwise vortex on a chordwise connecting line of the spanwise vortex end point, and setting the induced velocity of a vortex system on the control point:

wherein: (i, j) is a control point; (m, n) is a load point; k is the number of leaves; gamma-shaped_nm ^sIs the spanwise vorticity; gamma-shaped_nm ^cChord vortex strength; gamma-shaped_nm ^tWake vortex intensity; gamma-shaped_tipTip vortex strength; gamma-shaped_hubHub vortex strength;

the induction speed of the source system on the control band is as follows:

wherein: q_nmIs the strength of the source sink; k^Q _ijnmkThe influence coefficient of the line source element on the Kth blade is shown; the resultant velocity at the (i, j) th control point in the flow field is:

wherein: k^Q _ijnmkThe influence coefficient of the line source element on the Kth blade is shown; q_nmIs the strength of the source sink;

performing iterative computation on the singularity system according to the blade section serving as an initial surface until all control points on the blade meet the boundary condition of an object plane with the total found speed equal to zero, and obtaining the final shape of the blade;

the inner culvert guide vane wheel hub and the inner culvert guide vane blades are positioned inside the inner culvert guide vane chamber, the inner culvert guide vane blades are connected with the inner culvert guide vane chamber through welding and fixedly connected with the inner culvert guide vane wheel hub through nuts and positioning pins, and the inner culvert guide vane wheel hub is connected with the inner culvert guide vane wheel hub through a guide bearing and has the function of eliminating circumferential velocity components;

the inner duct impeller chamber is positioned inside the outer duct guide vane blade, comprises an inner duct impeller hub and an inner duct impeller blade, and also provides fixed support for the outer duct guide vane blade to serve as the hub;

the inner duct guide vane chamber is connected with the inner duct impeller chamber through bolts and comprises an inner duct guide vane hub and inner duct guide vane blades;

the working process is as follows:

water flow enters the water jet propeller through the water inlet and is guided to the outer culvert impeller chamber through the water inlet flow channel, the outer culvert transmission shaft drives the outer culvert impeller blades to do work in a rotating mode, the pressure energy and the kinetic energy of the water flow are improved, a part of the water flow eliminates circumferential velocity components through the outer culvert guide vane blades, a part of the water flow passes through the inner culvert impeller blades, the pressure energy generated by the outer culvert impeller is added to the part of the incoming flow, the cavitation resistance of the inner culvert impeller blades is favorable, the pressure energy and the kinetic energy are further improved through the rotating work of the inner culvert impeller blades, the circumferential velocity components are eliminated through the rectifying effect of the inner culvert guide vane blades, the two parts of the water flow are converged in the nozzle, a part of the pressure energy is converted into the kinetic energy through the nozzle, and finally the kinetic energy is sprayed out to generate thrust.

Has the advantages that:

1. the novel axial-flow double-duct water jet propeller is different from the traditional axial-flow water jet propeller, can improve the lift and overcome the greater flow loss on the premise of ensuring the large flow, and can be applied to navigation bodies such as high-speed ships, amphibious vehicles and the like.

2. The novel axial-flow type double-duct water-jet propeller is different from the traditional multistage water-jet propeller, and is short in axial length, small in occupied space, compact in structure, good in strength and rigidity and light in weight.

3. The novel axial flow type double-duct water jet propeller is low in maintenance cost, convenient to disassemble and capable of being combined and matched for use, and all parts are connected through flanges.

Drawings

FIG. 1 is an overall schematic view of a novel axial flow type double-duct water jet propeller according to the present invention;

FIG. 2 is a sectional view of a novel axial flow type double-duct water jet propeller according to the present invention;

FIG. 3 is a view of a novel axial flow type dual-ducted water jet propulsor outer ducted propulsion pump of the present invention;

FIG. 4 is a view of the inner ducted impeller pump of the novel axial flow type dual-ducted water jet propeller of the present invention;

the device comprises a support 1, a support 2, an outer culvert transmission shaft, a water inlet flow channel 3, an outer culvert impeller chamber 4, an outer culvert guide vane chamber 5, a nozzle 6, an outer culvert impeller hub 7, an outer culvert impeller blade 8, an outer culvert guide vane blade 9, an inner culvert transmission shaft 10, an inner culvert impeller hub 11, an inner culvert guide vane hub 12, an inner culvert impeller chamber 13, an inner culvert guide vane chamber 14, an inner culvert guide vane chamber 15, an inner culvert impeller blade 16, an inner culvert guide vane blade 16 and a flange plate 17.

Detailed Description

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

example 1

As shown in fig. 1 and 2, a novel axial flow type double-duct water jet propeller comprises a support 1, an outer duct transmission shaft 2, a water inlet flow channel 3, an outer duct impeller chamber 4, an outer duct guide vane chamber 5, a nozzle 6, an outer duct impeller hub 7, outer duct impeller blades 8, outer duct guide vane blades 9, an inner duct transmission shaft 10, an inner duct impeller hub 11, an inner duct guide vane hub 12, an inner duct impeller chamber 13, an inner duct guide vane chamber 14, inner duct impeller blades 15, inner duct guide vane blades 16 and a flange plate 17.

The support 1 is installed in the ship, the length, the width and the height of the support 1 are respectively 2000mm, 600mm and 800mm, and the radius of a fillet is 150 mm. The bottom of the bracket 1 is fixedly connected with a ship body through bolts, and the vertical section of the bracket is positioned between the outer culvert impeller chamber 4 and the outer culvert guide vane chamber 5, so that the bracket plays a role in supporting and fixing a pipeline;

the diameter of the outer culvert transmission shaft 2 is 50mm, and the outer culvert transmission shaft is fixedly connected with an outer culvert impeller hub 7;

the water inlet flow channel 3 is fixedly connected with a support through bolts and is connected with the outer ducted impeller chamber 4 through a flange plate 17, the diameter of the flange plate is 400mm, and 20 holes with the diameter of 18mm are uniformly distributed;

the outer ducted impeller chamber 4 is of an equal-diameter circular tube structure, the inner diameter of the outer ducted impeller chamber is 301mm, the wall thickness of the outer ducted impeller chamber is 8mm, flange plates are arranged at two ends of the outer ducted impeller chamber, 20 holes with the diameter of 18mm are uniformly distributed, the right side of the outer ducted impeller chamber 4 is connected with the water inlet runner 3 through bolts, and the left side of the outer ducted impeller chamber is connected with the outer ducted guide vane chamber 5 through;

the outer ducted guide vane chamber 5 is of an equal-diameter circular tube structure, the inner diameter of the outer ducted guide vane chamber is 301mm, the wall thickness of the outer ducted guide vane chamber is 8mm, flange plates are arranged at two ends of the outer ducted guide vane chamber, 20 holes with the diameter of 18mm are uniformly distributed, the right side of the outer ducted guide vane chamber 5 is connected with the outer ducted impeller chamber 4 through bolts, and the left side of the outer ducted guide vane chamber is connected with the;

the nozzle 6 is of a diameter reducing pipe structure, the wall thickness is 8mm, the inner diameter of an inlet on the right side is 301mm, a flange plate is arranged on the right side, 20 holes with the diameter of 18mm are uniformly distributed, and the nozzle 6 is connected with the outer duct guide vane chamber 5 through bolts and has the function of converting the pressure energy of water flow into kinetic energy and improving the injection speed;

as shown in fig. 3, the outer duct impeller hub 7 and the outer duct impeller blades 8 are rotating parts, the rotating speed is 1450rpm, the outer duct impeller hub is located inside the outer duct impeller chamber 4, the diameter of the blades is 300mm, the gap between blade tops is 0.5mm, the number of the blades is 5, mechanical energy input by the outer duct transmission shaft 2 is converted into energy of fluid through the rotation of the blades, the outer duct impeller blades 8 are fixed on the outer duct impeller hub 7 through nuts and positioning pins, and the outer duct impeller hub 7 is fixedly connected with the outer duct transmission shaft 2;

the outer ducted guide vane blades 9 are positioned inside the outer ducted guide vane chamber 5, the number of the blades is 8, the blades are fixedly connected with the outer ducted guide vane chamber 5 through welding, and are fixedly connected with the inner ducted impeller chamber 13 through nuts and positioning pins, and the blades have the function of eliminating the circumferential speed of water flow;

the right end of the inner culvert transmission shaft 10 is fixedly connected with the outer culvert impeller hub 7, the left end of the inner culvert transmission shaft is fixedly connected with the inner culvert impeller hub 11, and the diameter of the inner culvert transmission shaft is 25 mm;

as shown in fig. 4, the inner duct impeller hub 11 and the inner duct impeller blades 15 are rotating parts, the rotating speed is 1450rpm, the inner duct impeller hub is located inside the inner duct impeller chamber 13, the surface shape of the blades is obtained through formulas (1) to (3), the diameter of each blade is 149.5mm, the gap between blade tops is 0.25mm, the number of the blades is 6, mechanical energy input by the inner duct transmission shaft 10 is converted into energy of fluid through the rotation of the blades, the inner duct impeller blades 15 are fixed on the inner duct impeller hub 11 through nuts and positioning pins, and the inner duct impeller hub 11 is fixedly connected with the inner duct transmission shaft 10;

as shown in fig. 4, the inner duct guide vane wheel hub 12 and the inner duct guide vane blades 16 are located inside the inner duct guide vane chamber 14, the number of the blades is 8, the inner duct guide vane blades 16 are connected with the inner duct guide vane chamber 14 through welding and fixedly connected with the inner duct guide vane wheel hub 12 through nuts and positioning pins, and the inner duct guide vane wheel hub 12 is connected with the inner duct guide vane wheel hub 11 through a guide bearing and has the function of eliminating circumferential velocity components;

the inner ducted impeller chamber 13 is positioned inside the outer ducted guide vane blade 9, has the wall thickness of 5mm, comprises an inner ducted impeller hub 11 and an inner ducted impeller blade 15, also provides fixed support for the outer ducted guide vane blade 9 and plays a role of a hub;

the inner duct guide vane chamber 14 is connected with the inner duct impeller chamber 13 through bolts and comprises an inner duct guide vane hub 12 and inner duct guide vane blades 16;

the specific working process is as follows:

rivers get into water jet propeller through the water inlet, through the drainage of intake runner 3 to outer duct impeller chamber 4, outer duct transmission shaft 2 drives outer duct impeller blade 8 rotatory power, the pressure energy and the kinetic energy of rivers have obtained the improvement, circumferential velocity component is eliminated through outer duct stator blade 9 to some rivers, some rivers pass through inner duct impeller blade 15, do power through inner duct impeller blade 15's rotation, make pressure energy and kinetic energy further improve, circumferential velocity component is eliminated to the rectification effect of rethread inner duct stator blade 16, two parts rivers converge in spout 6, through spout 6 with some pressure energy conversion kinetic energy, final blowout, produce thrust.

The numerical calculation verifies that under the design working condition, the lift without adopting the double-duct water jet propeller is 11.5m, the double-duct water jet propeller is 12.6m, and the lift size is obviously improved.

The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.