CN115009487A - Rotor blade S-shaped anti-cavitation section structure and application and design method thereof - Google Patents
Rotor blade S-shaped anti-cavitation section structure and application and design method thereof Download PDFInfo
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- CN115009487A CN115009487A CN202210823544.2A CN202210823544A CN115009487A CN 115009487 A CN115009487 A CN 115009487A CN 202210823544 A CN202210823544 A CN 202210823544A CN 115009487 A CN115009487 A CN 115009487A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B71/00—Designing vessels; Predicting their performance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/18—Propellers with means for diminishing cavitation, e.g. supercavitation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/26—Blades
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The application belongs to the technical field of design methods of underwater vehicle rotor structures, and particularly relates to an S-shaped anti-cavitation section structure of a rotor blade and an application and design method thereof. The rotor blade of the present invention is designed with an S-shaped cross section that is centrosymmetric about the 0.5 chord length point, so the rotor of this embodiment has substantially the same hydrodynamic performance whether it is forward or reverse. Compared with the conventional symmetrical section rotor, the S-shaped section rotor has positive camber in the section from the leading edge to 0.5 times of chord length, so that the pressure value of the low-pressure area close to the suction surface of the leading edge is greatly increased during forward rotation or reverse rotation, thereby inhibiting the occurrence of cavitation, preventing the rotor blade from being cavitated and eroded, improving the anti-cavitation performance of the rotor blade of the channel side thruster, and reducing the radiation noise and the structural vibration noise caused by the cavitation of the rotor blade.
Description
Technical Field
The application belongs to the technical field of design methods of underwater vehicle rotor structures, and particularly relates to an S-shaped anti-cavitation section structure of a rotor blade and an application and design method thereof.
Background
In the process that the speed of the ship entering the port is gradually reduced, the steering force ship-turning moment generated by steering is gradually reduced, and the capability of controlling the course is gradually deteriorated. To solve this problem, another method of generating a turning moment, i.e., a side thruster, has been developed. As shown in fig. 1, in the rotation process of a conventional channel side thruster rotor, the pressure value of the blade surface of the rotor is large, the pressure value of the blade back of the rotor is low, and the pressure difference exists between the blade surface and the blade back of the rotor, so that thrust is continuously provided for the channel side thruster.
On the other hand, due to the fact that the distance between the pressure surface and the suction surface is small, a large pressure gradient is formed between the surface of the rotor blade and the blade back at the corresponding position, fluid can be enabled to turn over from the pressure surface to the end surface of the blade tip and then from the end surface of the blade tip to the suction surface, and due to the flowing characteristic, the fluid can easily generate cavitation at the position of the blade back of the rotor of the channel side thruster along with the generation of cavitation noise. Meanwhile, the blade back and the blade surface of the rotor blade section of the conventional channel side thruster are generally axisymmetric about a chord line, the camber is 0, and the pressure of the section shape near the front edge of the blade back is very low, so that the cavitation of the blade back is intensified, the pulsating pressure of the rotor blade and the inner wall of the nearby channel is remarkably increased, the rotor blade is also broken, and a major engineering accident is caused. The cavitation noise is generated by cavitation damage of the rotor blade caused by huge pressure impact generated when the cavitation bubbles collapse, so that the radiation noise of the channel side thruster is increased rapidly. Due to the influence of the factors, cavitation is easily generated near the rotor blade back of the conventional ship side thruster in the working process, fatigue damage of the rotor blade is enhanced, the service life of the rotor is shortened, noise is obviously increased, and the efficiency of the ship side thruster and the stealth performance of a ship or an underwater vehicle are greatly limited.
Disclosure of Invention
The present application aims to solve the above problems, and provide a rotor blade cross-sectional structure with anti-cavitation capability, and an application and a design method thereof, which optimally design the cross-sectional shape of the rotor blade, and design a rotor blade with an S-shaped cross-sectional shape. Compared with the rotor section of the traditional channel side thruster, the novel rotor section of the channel side thruster can effectively reduce the pressure drop of the rotor blade back at the position near the guide edge, prevent the blade from cavitation, avoid cavitation and denudation, reduce the excitation force of the blade, improve the propelling efficiency of the channel side thruster and reduce the radiation noise of the side thruster.
In order to achieve the purpose, the following technical scheme is adopted in the application.
An S-shaped anti-cavitation profile structure for a rotor blade, the rotor blade having an S-shaped profile structure which is centrosymmetric about a 0.5 chord point of the rotor blade.
The rotor blade S-shaped anti-cavitation profile structure as claimed in claim 1, wherein the camber of the S-shaped profile structure is positive in the range from the leading edge to 0.5 times of the chord length position, and increases along the chord line direction, gradually decreases after reaching the maximum value, and decreases to 0 at 0.5 times of the chord length position; the camber of the S-shaped section structure is a negative value from a position which is 0.5 times of the chord length to the rear edge part, the absolute value of the camber is firstly increased along the chord line direction and then gradually reduced after reaching the maximum value, and the camber is shrunk to 0 at the rear edge.
The anti-cavitation rotor is characterized in that the anti-cavitation rotor body is made of copper alloy materials, a plurality of blades connected with the periphery of a rotor hub are arranged on the rotor, the blades are of the S-shaped section structure, and the blades are radially arranged by taking the central shaft of the rotor hub as the center.
The shaft-driven type channel side thruster with the S-shaped anti-cavitation section structure comprises a rotor, a prime motor and a shaft system;
the blades of the rotor have an S-shaped section structure;
the prime motor is arranged at the central shaft in the channel or outside the channel, and when the prime motor is positioned at the central shaft in the channel, the prime motor drives the shaft system which drives the anti-cavitation rotor to rotate;
when the prime motor is positioned outside the channel, the prime motor drives the shaft system through the Z-shaped transmission device, and the shaft system drives the anti-cavitation rotor to rotate.
The wheel rim driving type groove channel side thruster with the S-shaped anti-cavitation profile structure comprises a wheel rim motor, a magnetic pole ring rotor, a rotor and a bearing
The blades of the rotor have an S-shaped section structure;
the rim motor is arranged in the hull, a motor stator of the rim motor is connected with a magnetic pole ring rotor through a bearing, and the magnetic pole ring rotor is fixedly connected with the anti-cavitation rotor; when the rim motor works, the magnetic pole ring rotor drives the anti-cavitation rotor to rotate relative to the motor stator.
A design method for the S-shaped anti-cavitation section structure of the rotor blade is further provided, and comprises the following steps:
(1) analyzing and selecting the geometric parameters of the channel side thruster according to the design conditions and the design requirements of the underwater vehicle, and determining the preliminary geometric shapes of a channel, a stator and a rotor;
(2) optimally designing the shape of the channel in the step (1) from the three aspects of the pressure of the inner wall of the channel, the pressure of the inlet of the channel and the pressure of the surface of the ship body, and taking the lowest pressure of the inner wall of the channel, the inlet of the channel and the surface of the ship body as a design target; calculating the flow field of the channel by a numerical calculation method, and if the channel hydrodynamic performance parameters obtained by solving meet the design requirements, determining the final geometric shape of the channel and entering the next step; otherwise, carrying out re-optimization design on the geometric shape of the channel until the design requirement is met;
(3) in terms of hydrodynamic performance and strength of the stator, optimally designing the shape of the stator in the step (1) to improve the strength of the stator and take the lowest pressure as a design target; calculating the flow field of the stator by a numerical calculation method, and if the hydrodynamic performance parameters and the strength of the stator obtained by solving meet the design requirements, determining the final geometric shape of the stator and entering the next step; otherwise, carrying out optimization design on the geometric shape of the stator again until the design requirement is met;
(4) optimally designing the shape of the rotor of the channel side thruster in the step (1), wherein the optimally designing steps are as follows:
4a) the method comprises the following steps of optimally designing size parameters of each radial position section of a rotor of the channel side thruster by taking an original symmetrical wing-shaped section as a basic section so as to improve the thrust, the propulsion efficiency and the lowest pressure of the rotor as design targets, wherein the size parameters comprise chord length distribution, thickness distribution and screw pitch distribution;
4b) designing the shape of each radial position profile from the leading edge to the chord length section of 0.5 times based on each radial position profile designed in the step (a); firstly, initially designing the maximum camber of each radial position section of the rotor to improve the pressure drop of a blade back near a front edge as a design target, then preliminarily designing the distribution form of the camber of the section in the chord direction from the front edge to a chord length section of 0.5 times, and improving the pressure value of a low pressure area of a suction surface as the design target, so that the shape of each radial position section from the front edge to the chord length section of 0.5 times is obtained, and the shape of the section is subjected to central symmetry by taking a chord length point of 0.5 times as a symmetry center, so that the shape of the whole section at each radial position is obtained;
4c) performing three-dimensional modeling on the rotor with the S-shaped section on the basis of the parameters of the sections of the rotor at all radial positions in the step (b); solving a three-dimensional flow field of the rotor with the S-shaped section by using the rotor thrust, the received power, the propulsion efficiency and the lowest pressure as measurement references, and determining the geometrical shape of the rotor section of the final channel side thruster if the rotor thrust, the received power, the propulsion efficiency and the lowest pressure obtained by solving all meet the design requirements; otherwise, the shape of each radial position section of the rotor is continuously optimally designed until the design requirement is met.
The beneficial effects are that:
the rotor blade of the present invention is designed with an S-shaped cross section that is centrosymmetric about the 0.5 chord length point, so the rotor of this embodiment has substantially the same hydrodynamic performance whether it is forward or reverse. Compared with the conventional symmetrical section rotor, the S-shaped section rotor has positive camber in the chord length section of 0.5 times of the guide edge, so that the pressure value of the low-pressure area close to the suction surface of the guide edge is greatly improved in forward rotation or reverse rotation, the cavitation is restrained, the rotor blade is prevented from being cavitated and degraded, the anti-cavitation performance of the rotor blade of the channel side thruster is improved, and the radiation noise and the structural vibration noise caused by the cavitation of the rotor blade are reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of a conventional slot side pusher rotor blade;
FIG. 2 is a schematic illustration of a cross-sectional configuration of a rotor blade having anti-cavitation capability;
FIG. 3 is a cloud of pressure distributions of the slot side pusher rotor blade backs in the original configuration;
FIG. 4 is a cloud of groove side pusher rotor blade back pressure distributions based on the structure of the present application;
FIG. 5 is a cloud of pressure profiles for a slot side pusher rotor blade face in an original configuration;
FIG. 6 is a cloud of groove side pusher rotor blade face pressure distributions based on the structure of the present application;
FIG. 7 is a cloud of low pressure location pressure profiles of the original structure;
figure 8 is a cloud of low pressure location pressure profiles based on the structure of the present application.
Detailed Description
The present application will be described in detail with reference to specific examples.
Based on the current situation and the problems, the invention provides a rotor blade section structure with anti-cavitation capability, and provides an application and a design method thereof, theoretical analysis and model selection are carried out on the geometric parameters of the rotor blade according to the design conditions and the design requirements of an underwater navigation body, and an optimized improvement scheme of the rotor blade is determined, so that the aims of inhibiting the cavitation of the rotor blade of the conventional channel side thruster, improving the cavitation initial rotating speed of the side thruster, preventing the cavitation erosion of the rotor blade, reducing the radiation noise of the channel side thruster and improving the anti-cavitation performance of the rotor of the channel side thruster are fulfilled.
The rotor blade section structure with the anti-cavitation capability is characterized in that the section of the rotor blade is of an S-shaped section structure, and the S-shaped section structure is centrosymmetric about a chord length point which is 0.5 times of the rotor blade.
Specifically, as shown in fig. 2, in the S-shaped cross-sectional structure, the camber is positive at the position from the leading edge to 0.5 times the chord length, increases first along the chord direction, gradually decreases after reaching the maximum value, and decreases to 0 at the position 0.5 times the chord length; and in the section from the position of 0.5 times of chord length to the rear edge, the camber is negative, the absolute value of the camber is firstly increased along the chord direction and gradually reduced after the absolute value reaches the maximum value, and the camber is shrunk to 0 at the rear edge. The S-shaped section is centrosymmetric about the 0.5 chord length point. Compared with the conventional symmetrical section rotor, the section of the S-shaped section rotor at different radius positions has camber, when the S-shaped section rotor rotates forwards, the alpha surface is the blade surface, the beta surface is the blade back, and the lowest pressure value of the low-pressure area of the beta surface is greatly improved; the S-shaped section is centrosymmetric about a chord length point of 0.5 times, so that the hydrodynamic performance of the side thruster rotor is basically the same in forward rotation and reverse rotation, when the S-shaped section rotor rotates reversely, the beta surface is the blade surface, the alpha surface is the blade back, and the lowest pressure value of the low-pressure area of the alpha surface is greatly improved.
To facilitate the description of the features of the cross-sectional structure of the rotor blade described above, the following embodiments are described in conjunction with specific design optimization procedures and simulation test results. The design method of the rotor blade section structure with the anti-cavitation capacity specifically comprises the following steps:
(1) analyzing and selecting the geometric parameters of the channel side thruster according to the design conditions and the design requirements of the underwater vehicle, and determining the preliminary geometric shapes of a channel, a stator and a rotor;
(2) optimally designing the shape of the channel in the step (1) from the three aspects of the pressure of the inner wall of the channel, the pressure of the inlet of the channel and the pressure of the surface of the ship body, and taking the lowest pressure of the inner wall of the channel, the inlet of the channel and the surface of the ship body as a design target; calculating the flow field of the channel by a numerical calculation method, and if the channel hydrodynamic performance parameters obtained by solving meet the design requirements, determining the final geometric shape of the channel and entering the next step; otherwise, carrying out re-optimization design on the geometric shape of the channel until the design requirement is met;
(3) in consideration of hydrodynamic performance and strength of the stator, optimally designing the shape of the stator in the step (1) to improve the strength and the lowest pressure of the stator as design targets; calculating the flow field of the stator by a numerical calculation method, and if the hydrodynamic performance parameters and the strength of the stator obtained by solving meet the design requirements, determining the final geometric shape of the stator and entering the next step; otherwise, carrying out optimization design on the geometric shape of the stator again until the design requirement is met;
(4) optimally designing the shape of the rotor of the channel side thruster in the step (1), wherein the optimally designing steps are as follows:
4a) the method comprises the following steps of optimally designing size parameters of each radial position section of a rotor of the channel side thruster by taking an original symmetrical wing-shaped section as a basic section so as to improve the thrust, the propulsion efficiency and the lowest pressure of the rotor as design targets, wherein the size parameters comprise chord length distribution, thickness distribution and screw pitch distribution;
4b) designing the shape of each radial position profile from the leading edge to the chord length section of 0.5 times based on each radial position profile designed in the step (a); firstly, carrying out primary design on the maximum camber of each radial position section of the rotor, taking the improvement of the pressure drop of a blade back near the front edge as a design target, then carrying out primary design on the distribution form of the camber of the section in the chord direction from the front edge to a chord length section of 0.5 times, and taking the improvement of the pressure value of a low pressure area of a suction surface as a design target, thus obtaining the shape of each radial position section from the front edge to the chord length section of 0.5 times, and carrying out central symmetry on the section shape of the section by taking a chord length point of 0.5 times as a symmetry center, thus obtaining the shape of the whole section at each radial position;
4c) performing three-dimensional modeling on the rotor with the S-shaped section on the basis of the parameters of the sections of the rotor at all radial positions in the step (b); solving a three-dimensional flow field of the rotor with the S-shaped section by using the rotor thrust, the received power, the propulsion efficiency and the lowest pressure as measurement references, and determining the geometrical shape of the rotor section of the final channel side thruster if the rotor thrust, the received power, the propulsion efficiency and the lowest pressure obtained by solving all meet the design requirements; otherwise, the shape of each radial position section of the rotor is continuously optimally designed until the design requirement is met.
The rotor blade section shape is optimally designed on the basis of the basic structure of a channel side thruster of certain equipment, wherein 1# adopts a rotor blade with a conventional symmetrical section structure, and 2# adopts a rotor blade with an S-shaped section structure used in the application. The total thrust of the side thruster, the received power of the rotor and the lowest absolute pressure (1 m water depth) of the rotor are used as measurement standards, the model is subjected to numerical simulation through CFD numerical calculation software, nonstructural grids are adopted to perform nonstationary hydrodynamic calculation on the channel thruster, different schemes of the No. 1 rotor and the No. 2 rotor are calculated respectively, and the calculation results are shown in table 1.
TABLE 1 hydrodynamic calculation results for different rotor schemes with slot propulsion
The distribution cloud charts of the pressure of the back of the rotor blade, the pressure of the blade surface and the pressure at the low-pressure area of the rotor blade obtained by the two schemes through simulation are shown in figures 3-8; as can be seen from the figure, the rotors with two different section shapes can meet the requirements of ship thrust and power, and the rotor section shape of the 2# scheme designed in the application enables the pressure distribution characteristic of the low-pressure area of the rotor to be superior to that of the traditional 1# scheme, wherein the minimum absolute pressure (1 m water depth) of the rotor of the side thruster is 29496pa, and the pressure value is far higher than the critical cavitation pressure of water (the pressure is lower than the critical cavitation pressure to generate cavitation), so that the cavitation can be effectively avoided, and the S-shaped section rotor blade is proved to be superior to the conventional symmetrical section rotor in the aspect of anti-cavitation performance.
On the basis, the shape of the S-shaped section rotor blade is optimally designed, and three rotor blades with different section shapes are designed according to different design indexes and requirements. The thrust of the side thruster and the received power of the rotor are used as measurement standards, numerical simulation is carried out on the model through CFD numerical calculation software, steady hydrodynamic calculation is carried out on the channel thruster through a non-structural grid, different schemes of No. 3, No. 4 and No. 5 rotors are calculated respectively, and calculation results are shown in table 2.
TABLE 2 hydrodynamic calculation results for different rotor schemes with slot propulsion
Through simulation, it can be determined that the rotor blades with different section shapes obtained based on the scheme, the design scheme and the optimization method of the application can meet the requirements of ship thrust and power. The total thrust of the side thruster when the rotor section shape I is adopted is 25879.54N, the received power of the rotor is 106.84kW, and performance parameters of each structure are far superior to those of the existing equipment, so that various design results meeting different design requirements and targets can be obtained by combining the scheme and the design method, the design results far superior to the existing design scheme on different design indexes are obtained, and the application prospect is wide.
In particular, the present invention can be applied to both an axle-driven type channel side pusher and a rim-driven type channel side pusher.
When the shaft driving type channel side thruster is applied to the shaft driving type channel side thruster, the main structure comprises rotor blades, a prime motor and a shaft system, wherein the prime motor can be arranged outside a ship body or inside the ship body. When the prime mover is positioned at the central shaft (outside the ship body) in the channel, the prime mover drives the shaft to rotate, and the rotor blades are connected with the shaft and further driven to rotate by the shaft; when the prime mover is located inside the ship body, the prime mover drives the shaft to rotate through the Z-shaped transmission device, and the shaft drives the rotor to rotate.
Main structure comprises parts such as rim motor, magnetic pole ring rotor, rotor blade, bearing when being applied to driving channel side pusher of rim, and the rim motor is installed inside the hull, and the motor stator and the magnetic pole ring rotor of rim motor pass through the bearing and connect, and magnetic pole ring rotor and rotor blade fixed connection, when rim motor during operation, magnetic pole ring rotor drives the relative motor stator rotation of rotor blade. When the channel side thrust is operating in fluid, the fluid enters the channel from one side and exits the channel from the other side due to the pumping action of the rotor, creating a side thrust.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (6)
1. An S-shaped anti-cavitation profile structure of a rotor blade, characterized in that the rotor blade has an S-shaped profile structure which is centrosymmetric with respect to a chord point of 0.5 times the profile of the rotor blade.
2. The rotor blade S-shaped anti-cavitation profile structure as claimed in claim 1, wherein the camber of the S-shaped profile structure is positive in the range from the leading edge to 0.5 times the chord length, and increases along the chord line direction, gradually decreases after reaching the maximum value, and decreases to 0 at 0.5 times the chord length; the camber of the S-shaped section structure is a negative value from a position which is 0.5 times of the chord length to the rear edge part, the absolute value of the camber is firstly increased along the chord line direction and then gradually reduced after reaching the maximum value, and the camber is shrunk to 0 at the rear edge.
3. The cavitation-resistant rotor having the S-shaped cavitation-resistant cross-sectional structure according to claim 1 or 2, wherein the cavitation-resistant rotor body is formed of a copper alloy material, and a plurality of blades connected to the outer periphery of the rotor hub are formed on the rotor, and the blades have the S-shaped cross-sectional structure and are radially arranged around the central axis of the rotor hub.
4. A shaft-driven channel side pusher having an S-shaped anti-cavitation profile structure as claimed in claim 1 or 2, comprising a rotor, a prime mover, a shaft system;
the blades of the rotor have an S-shaped section structure;
the prime motor is arranged at the central shaft in the channel or outside the channel, and when the prime motor is positioned at the central shaft in the channel, the prime motor drives the shaft system which drives the anti-cavitation rotor to rotate;
when the prime motor is positioned outside the channel, the prime motor drives the shaft system through the Z-shaped transmission device, and the shaft system drives the anti-cavitation rotor to rotate.
5. Rim-driven channel side-pusher with S-shaped anti-cavitation profile structure according to claim 1 or 2, characterized in that it comprises a rim motor, a pole-ring rotor, a bearing
The blades of the rotor have an S-shaped section structure;
the rim motor is arranged in the hull, a motor stator of the rim motor is connected with a magnetic pole ring rotor through a bearing, and the magnetic pole ring rotor is fixedly connected with the anti-cavitation rotor; when the rim motor works, the magnetic pole ring rotor drives the anti-cavitation rotor to rotate relative to the motor stator.
6. A method of designing an S-shaped anti-cavitation profile for a rotor blade according to claim 1, comprising the steps of:
(1) analyzing and selecting the geometric parameters of the channel side thruster according to the design conditions and the design requirements of the underwater vehicle, and determining the preliminary geometric shapes of a channel, a stator and a rotor;
(2) optimally designing the shape of the channel in the step (1) from the three aspects of the pressure of the inner wall of the channel, the pressure of the inlet of the channel and the pressure of the surface of the ship body, and taking the lowest pressure of the inner wall of the channel, the inlet of the channel and the surface of the ship body as a design target; calculating the flow field of the channel by a numerical calculation method, and if the channel hydrodynamic performance parameters obtained by solving meet the design requirements, determining the final geometric shape of the channel and entering the next step; otherwise, carrying out re-optimization design on the geometric shape of the channel until the design requirement is met;
(3) in terms of hydrodynamic performance and strength of the stator, optimally designing the shape of the stator in the step (1) to improve the strength of the stator and take the lowest pressure as a design target; calculating the flow field of the stator by a numerical calculation method, and if the hydrodynamic performance parameters and the strength of the stator obtained by solving meet the design requirements, determining the final geometric shape of the stator and entering the next step; otherwise, carrying out optimization design on the geometric shape of the stator again until the design requirement is met;
(4) optimally designing the shape of the rotor of the channel side thruster in the step (1), wherein the optimally designing steps are as follows:
4a) the method comprises the following steps of optimally designing size parameters of each radial position section of a rotor of the channel side thruster by taking an original symmetrical wing-shaped section as a basic section so as to improve the thrust, the propulsion efficiency and the lowest pressure of the rotor as design targets, wherein the size parameters comprise chord length distribution, thickness distribution and screw pitch distribution;
4b) designing the shape of each radial position profile from the leading edge to the chord length section of 0.5 times based on each radial position profile designed in the step (a); firstly, carrying out primary design on the maximum camber of each radial position section of the rotor, taking the improvement of the pressure drop of a blade back near the front edge as a design target, then carrying out primary design on the distribution form of the camber of the section in the chord direction from the front edge to a chord length section of 0.5 times, and taking the improvement of the pressure value of a low pressure area of a suction surface as a design target, thus obtaining the shape of each radial position section from the front edge to the chord length section of 0.5 times, and carrying out central symmetry on the section shape of the section by taking a chord length point of 0.5 times as a symmetry center, thus obtaining the shape of the whole section at each radial position;
4c) performing three-dimensional modeling on the rotor with the S-shaped section on the basis of the parameters of the sections of the rotor at all radial positions in the step (b); solving a three-dimensional flow field of the rotor with the S-shaped section by using the rotor thrust, the received power, the propulsion efficiency and the lowest pressure as measurement references, and determining the geometrical shape of the rotor section of the final channel side thruster if the rotor thrust, the received power, the propulsion efficiency and the lowest pressure obtained by solving all meet the design requirements; otherwise, the shape of each radial position section of the rotor is continuously optimally designed until the design requirement is met.
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| CN202210823544.2A CN115009487B (en) | 2022-07-14 | 2022-07-14 | Rotor blade S-shaped anti-cavitation profile structure, application and design method thereof |
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| CN115009487B (en) | 2024-05-17 |
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