CN109033645B - Novel rudder anti-corrosion electrode and design method thereof - Google Patents
Novel rudder anti-corrosion electrode and design method thereof Download PDFInfo
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Abstract
The invention relates to the field of ships, in particular to a rudder anti-corrosion electrode structure with cavitation resistance and drag reduction effects and a design method thereof. When in design, the maximum value of the negative pressure coefficient of the rudder anti-corrosion electrode working surface is minimized and the rudder resistance is minimized to form a multi-objective function, and the optimal anti-corrosion electrode geometric shape is obtained through the least square method. By adopting the method, the structural shape of the anti-corrosion electrode is set to be an ellipsoid-like shape, so that the fluid separation at the anti-corrosion zinc block of the rudder can be effectively inhibited, the anti-cavitation performance is improved, the cavitation and erosion phenomena are improved, and the resistance of the rudder is reduced.
Description
Technical Field
The invention relates to the field of ships, in particular to a novel rudder anti-corrosion electrode and a design method thereof.
Background
The method of applying electrochemical methods to prevent and mitigate corrosion of metals is called electrochemical protection. The electrochemical protection mainly comprises a cathode protection method of a sacrificial electrode and an impressed current cathode protection method. However, the impressed current cathodic protection method has high requirements on current density and is difficult to meet the expected corrosion prevention requirements, so the common method for the ship corrosion prevention treatment at present is a cathodic protection method of a sacrificial electrode.
The rudder is used as an important part on a ship, is soaked in water for a long time, is influenced by the high-speed wake flow of the propeller and is often in an active state, so that the phenomena of hydrolytic corrosion, impact corrosion and the like are easy to occur. In order to effectively inhibit the corrosion phenomenon of the control surface, the existing standard provides that anti-corrosion electrodes of the rudder are respectively arranged on the control surface and the back of the rudder, and more active metal is used for replacing corrosion, namely a sacrificial electrode protection method.
However, the corrosion prevention electrode specified in the current standard is often a flat plate or a long strip, which forms an angle of about 90 ° with the surface of the rudder blade, has a shape distortion, is easy to generate a fluid separation phenomenon, and is located in a main action region of the propeller wake, so that a cavitation phenomenon occurs at a low speed. The test result of a real ship shows that the cavitation phenomenon of the original rudder anti-corrosion electrode can occur before the surface at a lower navigational speed. That is, the anti-corrosion electrode may not perform the anti-corrosion function, and the cavitation phenomenon caused by the anti-corrosion electrode may cause cavitation erosion, increase the maintenance cost, and aggravate the radiation noise caused by the local vibration of the rudder blade and the tail of the ship body and the structural vibration. Therefore, the existing rudder anti-corrosion electrode cannot meet the requirement, and the improved design of the rudder anti-corrosion electrode is urgently needed.
Disclosure of Invention
The invention aims to provide a novel anti-corrosion electrode for a rudder and a design method thereof, which can effectively inhibit fluid separation at the anti-corrosion electrode for the rudder, improve anti-cavitation performance, improve cavitation erosion phenomenon and reduce resistance of the rudder.
In order to achieve the purpose, the invention adopts the following technical scheme.
The novel ship rudder anti-corrosion electrode is in a smooth ellipsoid-like structure, and the geometric shapes of a thickness distribution form curve S1 of the anti-corrosion electrode along the chord length direction, a thickness distribution form curve S2 along the extension direction and a distribution curve S3 of the thickness distribution along the chord direction and the camber along the chord direction enable the negative pressure coefficient of a rudder angle of 0DEG to the rudder anti-corrosion electrode to be minimum, and the negative pressure coefficient
Where p is the pressure on the surface of the rudder anti-corrosion electrode, p 0 For reference pressure, ρ is the sea water density, V S The ship speed.
The novel rudder anti-corrosion electrode further comprises an iron core penetrating through the interior of the novel rudder anti-corrosion electrode, two ends of the iron core are welded on a base plate to be attached to a rudder blade through the base plate, the base plate is welded on the rudder blade, the working surface area of the novel rudder anti-corrosion electrode is consistent with the area of a flat-plate-shaped electrode, and the number of the novel anti-corrosion electrode structures is the same as that of the flat-plate-shaped anti-corrosion electrodes; the novel rudder anti-corrosion electrodes are uniformly distributed on the surface of the rudder blade so that the current density on the surface of the rudder blade is uniformly distributed.
The design method of the novel ship rudder anti-corrosion electrode comprises the following steps:
determining the structure, the number and the mounting position of novel rudder anti-corrosion electrodes according to the requirements of a target rudder;
step two, determining the length L of the novel anti-corrosion electrode parallel to the inflow direction, the width B parallel to the rudder extension direction, the maximum thickness T, a thickness distribution form curve S1 along the chord length direction, a thickness distribution form curve S2 along the extension direction, the distribution of the thickness along the chord direction and a distribution curve S3 of the camber along the chord direction as basic parameters;
step three, calculating the pressure distribution of the novel rudder anti-corrosion electrode at a rudder angle of 0 degree under the design working condition, and converting the pressure distribution into a negative pressure coefficient, wherein the negative pressure coefficient is defined as:
wherein p is the pressure of the surface of the novel rudder anti-corrosion electrode, p 0 For reference pressure, ρ is the sea water density, V S And determining specific parameters for the ship navigational speed by iterative calculation by taking the minimum value of the maximum negative pressure coefficient of the surface of the novel anti-corrosion electrode as an objective function.
The further improvement of the scheme also comprises that when the novel rudder anti-corrosion electrode is designed in the step one, the area of the working surface of the novel rudder anti-corrosion electrode is consistent with that of the flat-plate-shaped electrode, and the number of the novel anti-corrosion electrode structures is the same as that of the flat-plate-shaped anti-corrosion electrodes; the novel rudder anti-corrosion electrodes are uniformly distributed on the surface of the rudder blade so that the current density on the surface of the rudder blade is uniformly distributed.
The further improvement of the scheme also comprises the step two, the thickness distribution form of each section curve S1 in the chord direction is kept consistent, and the thickness distribution form of each section curve S2 in the spanwise direction is kept consistent; making each section curve S3 have the same shape; the length L, the width B, the maximum thickness T, and the flat plate-like corrosion-resistant electrode are in agreement as initial data, the curves S1 and S2 are symmetric curves as initial data, and the curve S3 is an ellipse having a major axis L and a minor axis B as initial data.
The further improvement of the scheme also comprises that the specific optimization design process of the novel rudder anti-corrosion electrode in the step three comprises the following steps: the method comprises the following steps that a, parameters of the length L, the width B, the maximum thickness T, the curve S2 and the curve S3 are kept unchanged, the thickness distribution form of the curve S1 in the chord direction is used as an adjusting parameter, the maximum value of the negative pressure coefficient of the working surface of the rudder anti-corrosion electrode is minimized to be an objective function, the rudder hydrodynamic force under the paddle-rudder system is calculated by a numerical calculation method, and the thickness distribution form of the curve S1 in the chord direction is used as a design result of the process a;
b, keeping the parameters of the length L, the width B, the maximum thickness T, the curve S1 and the curve S3 unchanged on the basis, taking the thickness distribution form of the curve S2 in the spanwise direction as an adjustment parameter, taking the maximum value of the negative pressure coefficient of the working surface of the rudder anti-corrosion electrode as a target function, calculating the rudder water power under the paddle-rudder system by using a numerical calculation method, and taking the thickness distribution form of the curve S1 in the spanwise direction as a design result of the process B;
c, keeping the parameters of the length L, the width B, the maximum thickness T, the curve S1 and the curve S2 unchanged on the basis, taking the geometric shape of the curve S3 as an adjusting parameter, minimizing the maximum value of the negative pressure coefficient of the rudder anti-corrosion electrode working surface as an objective function, calculating the rudder hydrodynamic force under the paddle-rudder system by using a numerical calculation method, and taking the geometric shape of the curve S3 as a design result of the process c;
and d, taking the design results of the process a, the process b and the process c as final parameters of the novel rudder anti-corrosion electrode.
Further improvement of the above scheme further comprises, after the step c, the steps of:
the process c1 is to keep the area of the rudder anti-corrosion electrode working surface consistent with that of the original flat anti-corrosion electrode, and to take different values for the length L, the width B and the maximum thickness T;
and c2, aiming at various geometric schemes obtained in the c1, repeating the process a, the process b and the process c to optimally design the parameters S1, S2 and S3, forming a multi-objective function by minimizing the maximum negative pressure coefficient of the rudder anti-corrosion electrode working surface and the rudder resistance, and solving by a least square method to obtain the optimal anti-corrosion electrode geometric shape.
The beneficial effects are that:
(1) The novel anti-corrosion electrode for the rudder can obviously improve the uniformity of a flow field at the anti-corrosion electrode for the rudder, increase the minimum pressure value at the position, improve the anti-cavitation performance and greatly improve the initial cavitation speed.
(2) The novel anti-corrosion electrode for the rudder, provided by the invention, can obviously improve the cavitation and erosion phenomena of the anti-corrosion electrode for the rudder, prolong the service life and reduce the maintenance cost.
(3) The novel ship rudder anti-corrosion electrode provided by the invention can obviously inhibit separation vortex at the rudder anti-corrosion electrode, reduce the resistance of the rudder and improve the quick performance of a ship.
(4) The novel ship rudder anti-corrosion electrode provided by the invention can reduce rudder blade vibration caused by cavitation of the rudder anti-corrosion electrode and structural radiation noise caused by vibration.
(5) The novel anti-corrosion electrode for the rudder, provided by the invention, can be used for keeping the current uniformity of the surface of the rudder blade without changing the installation position of the anti-corrosion electrode for the rudder, so that the due anti-corrosion effect of the novel anti-corrosion electrode for the rudder is achieved.
Drawings
FIG. 1 is a schematic flow diagram of a novel rudder anti-corrosion electrode design method;
FIG. 2 is a front elevation view of the rudder blade (as viewed from the starboard side of the ship) with the original rudder erosion protection electrodes installed;
FIG. 3 is a left cross-sectional view (looking from stern to bow) of the rudder blade with the original rudder anti-corrosion electrodes installed;
FIG. 4 is a front elevation view of a rudder blade (viewed from the starboard side of the ship) with the novel rudder erosion protection electrode installed;
FIG. 5 is a left cross-sectional view (looking from stern to bow) of a rudder blade with the novel rudder corrosion protection electrode installed;
FIG. 6 is a view of a novel rudder erosion protection electrode installation;
FIG. 7 is a thickness profile curve of curve S1 in the chord direction;
FIG. 8 is a thickness profile curve of curve S2 in the spanwise direction;
FIG. 9 is a thickness profile curve in the span-wise direction for curve S3;
FIG. 10 is a cloud diagram of the pressure distribution of the anti-corrosion electrode of the original rudder corresponding to a real ship 24-joint speed of 0deg (front view);
fig. 11 is a cloud of the novel rudder anti-corrosion electrode pressure distribution at 0deg (front view) at 24 knots corresponding to a real ship.
The reference numbers thereof include:
the rudder blade comprises a rudder blade 1, a novel anti-corrosion electrode 2, an original rudder anti-corrosion electrode 3, an iron core 4, a base plate 5, an anti-corrosion electrode working surface 6, a rudder blade front edge 7, a rudder blade rear edge 8, a rudder blade upper end 9 and a rudder blade lower end 10.
Detailed Description
The invention is described in detail below with reference to specific embodiments.
The invention will be further described in detail with reference to the following drawings and specific examples so as to facilitate a clearer understanding of the invention, but the invention is not limited to the following.
A novel ship rudder anti-corrosion electrode comprises a rudder blade 1, the section of the rudder blade 1 can be symmetrical or asymmetrical, and the type of the rudder blade 1 can also be a common rudder or a flap rudder. The novel anti-corrosion electrodes 2 are generally arranged at the middle upper part and the middle lower part of the inner side and the outer side of the rudder blade 1 respectively, and different numbers of novel anti-corrosion electrodes 2 can be arranged at different positions of the rudder blade according to actual requirements. The novel anti-corrosion electrode 2 is in a smooth ellipsoid shape or other streamline shape capable of inhibiting fluid separation. An iron core 4 runs through inside the novel rudder anticorrosion electrode, and 4 both ends of iron core link to each other with backing plate 5 through the welding, and backing plate 5 laminates with rudder blade 1 mutually through the welding, and anticorrosion electrode working face 6 exposes plays the corrosion protection in the sea water.
The design method of the novel rudder anti-corrosion electrode comprises the following steps:
determining the number and the installation positions of anti-corrosion electrodes of the rudder according to the requirement of a target rudder, and taking the number and the installation positions as fixed parameters for designing the anti-corrosion electrodes; when the novel rudder anti-corrosion electrode is designed, the area of the working surface of the novel rudder anti-corrosion electrode is consistent with that of the flat-plate-shaped electrodes, so that when the number of the anti-corrosion electrodes is determined, a method for determining the number of the flat-plate-shaped anti-corrosion electrodes can be adopted, and the method is specifically shown in GJB157A-2008; according to the industry standard and the national standard, the working surface area and the flat-plate electrode area are limited;
further, the uniform distribution of the current density on the surface of the rudder blade is taken as a main reference standard when the installation position of the rudder anti-corrosion electrode is determined
Step two, the novel rudder anti-corrosion electrode is of an ellipsoid-like structure, and the length L (see fig. 6) parallel to the inflow direction, the width B (see fig. 4) parallel to the rudder extension direction, the maximum thickness T (see fig. 6), the thickness distribution form curve S1 (see fig. 7) along the chord length direction, the thickness distribution form curve S2 (see fig. 8) along the extension direction, the distribution of the thickness along the chord direction and the distribution curve S3 (see fig. 9) of the camber along the chord direction are used as basic numbers during design.
In order to simplify the design process and improve the calculation efficiency, the thickness distribution form of each section curve S1 in the chord direction is consistent, the thickness distribution form of each section curve S2 in the span direction is consistent, and each section curve S3 has the same shape. The initial data is L, B and T are consistent with the flat plate-shaped anti-corrosion electrode, the initial data is S1 and S2 are symmetric curves, and the initial data is a curve S3 in contact with the surface of the rudder blade, which is an ellipse with a major axis L and a minor axis B.
Thirdly, optimally designing the rudder anti-corrosion electrode according to the basic parameters in the second step, calculating the pressure distribution of the rudder anti-corrosion electrode at a rudder angle of 0 degree under the design working condition, and converting the pressure distribution into a negative pressure coefficient, wherein the negative pressure coefficient is defined as:
where p is the pressure on the surface of the rudder anti-corrosion electrode, p 0 For reference pressure, ρ is the sea water density, V S The ship speed. And (3) minimizing the maximum negative pressure coefficient on the surface of the corrosion-prevention electrode as a target, and determining an optimal scheme through iterative calculation.
The specific process of the geometric optimization design of the rudder anti-corrosion electrode comprises the following steps:
in the process a, parameters such as the length L, the width B, the maximum thickness T, the curve S2 and the curve S3 are kept unchanged, the thickness distribution form of the curve S1 in the chord direction is an adjustment parameter, the maximum value of the negative pressure coefficient of the working surface of the rudder anti-corrosion electrode is minimized to be a target function, the rudder hydrodynamic force under the paddle-rudder system is calculated by using a three-dimensional surface element method or a computational fluid dynamics method, and the thickness distribution form of the curve S1 in the chord direction is used as a design result of the process;
b, on the basis of the process a, parameters such as the length L, the width B, the maximum thickness T, a curve S1 and a curve S3 are kept unchanged, the thickness distribution form of the curve S2 in the spanwise direction is an adjustment parameter, the maximum value of the negative pressure coefficient of the rudder anti-corrosion electrode working surface is minimized into a target function, the rudder hydrodynamic force under the paddle-rudder system is calculated by using a numerical calculation method (a three-dimensional surface element method or a computational fluid mechanics method), and the optimal thickness distribution form of the curve S1 in the spanwise direction is used as a design result of the process;
c, on the basis of the process B, keeping parameters such as the length L, the width B, the maximum thickness T, the curve S1 and the curve S2 unchanged, minimizing the maximum value of the negative pressure coefficient of the working surface of the rudder anti-corrosion electrode into an objective function by taking the geometric shape of the curve S3 as an adjustment parameter, and calculating the rudder hydrodynamic force under the paddle rudder system by using a numerical calculation method (a three-dimensional surface element method or a computational fluid mechanics method), wherein the design result of the process is a design scheme of the rudder anti-corrosion electrode;
and d, taking the design results of the process a, the process b and the process c as final parameters of the novel rudder anti-corrosion electrode.
In order to further improve the design effect of the corrosion-resistant motor, the further improvement comprises a process of further optimizing the design after the process c, wherein the process comprises
The process c1 is that the length L, the width B and the maximum thickness T are changed to form various geometric schemes on the principle that the working surface area of the rudder anti-corrosion electrode is kept consistent with the flat anti-corrosion electrode, and in the process of designing the shapes and the structures of the actual ship and the rudder, a limited centralized scheme can be determined by technicians in the field according to design requirements and national standards;
and c2, aiming at various geometric schemes obtained in the c1, repeating the processes a, b and c to optimally design parameters S1, S2 and S3, forming a multi-objective function by minimizing the maximum negative pressure coefficient of the rudder anti-corrosion electrode working surface and the rudder resistance, and solving by a least square method to obtain the optimal anti-corrosion electrode geometric shape.
In order to clearly know the cavitation resistance and the resistance reduction effect of the novel rudder anti-corrosion electrode, a paddle and a rudder model of a ship on a certain water surface are used as design carriers, a novel rudder anti-corrosion electrode 2 is designed on the basis of an original rudder anti-corrosion electrode 3, and the novel rudder anti-corrosion electrode is installedCFD calculation and model tests are carried out on the paddle and rudder models of the two rudder anti-corrosion electrodes. Wherein, fig. 7 is a thickness distribution form of the novel anti-corrosion electrode S1 curve along the chord direction, in the figure, x/c =0 points to the rudder blade trailing edge 8,x/c =1 points to the rudder blade leading edge 7.t is t max Is the maximum thickness in the chord direction; FIG. 8 shows the thickness distribution of the novel anti-corrosion electrode S2 curve along the span direction, wherein x/c =0 points to the upper end 9,x/c =1 points to the lower end 10,h of the rudder blade max The maximum thickness in the spanwise direction; fig. 9 is a S3 curve shape of the novel rudder anti-corrosion electrode; the novel anti-corrosion electrode has the length L =25mm and the width B =10mm.
In this embodiment, the rudder span length is 198.7mm and the propeller diameter is 240mm. The existing anti-corrosion electrode (see fig. 2 and 3) designed according to the national standard is in a flat plate shape, and the length direction of the existing anti-corrosion electrode is arranged along the direction of a streamline. When the new anti-corrosion electrode is designed, the parameters such as length, width, thickness and the like can be kept the same as those of the traditional flat plate electrode, and the flat plate is optimally designed into an ellipsoid-like shape (see fig. 4 and 5).
STAR-CCM + software is adopted to calculate the rudder hydrodynamic performance and the anti-cavitation performance of the two rudder anti-corrosion electrodes, and a table 1 shows the calculation result of the rudder resistance of the two rudder anti-corrosion electrodes under the working conditions of the rotating speed of 1200rpm and the advancing speed of 4.8 m/s.
TABLE 1
| Corrosion-resistant electrode | resistance/N |
| Flat plate shape | 9.98 |
| Streamline form | 8.58 |
As can be seen from the table 1, after the novel rudder anti-corrosion electrode 2 is installed, the rudder resistance is reduced by 8.58N from 9.98N, the resistance reduction value is 1.4N, and the resistance reduction degree is 14.02%, so that the installation of the novel rudder anti-corrosion electrode 2 can be favorable for improving the rapid performance of the ship.
Fig. 10 is a cloud chart of the pressure distribution of the original rudder anti-corrosion electrode at 0deg (front view) at the sailing speed of the real ship 24 knots, and it can be seen from the cloud chart that under the working condition, the minimum absolute pressure value of the original rudder anti-corrosion electrode 3 is-3926.1 Pa, which is already lower than the saturation steam pressure 2300Pa at the moment, indicating that the cavitation phenomenon has occurred at the moment. Fig. 11 is a cloud diagram of the pressure distribution of the novel rudder anti-corrosion electrode when the real ship is at a speed of 24 knots (front view), and it can be seen from fig. 11 that the minimum pressure value of the novel rudder anti-corrosion electrode 2 under this working condition is 9157.2Pa, which is much greater than the saturated steam pressure 2300Pa, that is, no cavitation phenomenon occurs at this time. By combining the developed CFD calculation and model test results, the original rudder anti-corrosion electrode 2 is developed to generate cavitation under the working condition of corresponding to the real ship speed of 16 knots, and the novel rudder anti-corrosion electrode 2 still does not generate cavitation under the working condition of 26 knots, so that the cavitation starting navigational speed of the novel rudder anti-corrosion electrode 2 can be increased by more than 10 knots. Therefore, the embodiment shows that the novel anti-corrosion electrode for the rudder has good cavitation resistance and drag reduction effect.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention has been 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 invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (4)
1. The design method of the novel ship rudder anti-corrosion electrode is characterized by comprising the following steps of:
determining the structure, the number and the installation position of novel rudder anti-corrosion electrodes according to the requirements of a target rudder;
determining the length L of the novel anti-corrosion electrode parallel to the inflow direction, the width B parallel to the rudder spanwise direction, the maximum thickness T, a thickness distribution form curve S1 along the chord length direction, a thickness distribution form curve S2 along the spanwise direction, the distribution of the thickness along the chord direction and a distribution curve S3 of the camber along the chord direction as basic parameters;
step three, calculating the pressure distribution of the novel rudder anti-corrosion electrode at a rudder angle of 0 degree under the design working condition, and converting the pressure distribution into a negative pressure coefficient, wherein the negative pressure coefficient is defined as:
wherein p is the pressure on the surface of the novel rudder anti-corrosion electrode, p 0 For reference pressure, ρ is the sea water density, V S Determining specific parameters for the ship speed by iterative calculation by taking the minimum value of the maximum negative pressure coefficient of the surface of the novel anti-corrosion electrode as an objective function;
the specific optimization design process of the novel rudder anti-corrosion electrode comprises the following steps:
the method comprises the following steps that a, parameters of the length L, the width B, the maximum thickness T, the curve S2 and the curve S3 are kept unchanged, the thickness distribution form of the curve S1 in the chord direction is used as an adjusting parameter, the maximum value of the negative pressure coefficient of the working surface of the rudder anti-corrosion electrode is minimized to be an objective function, the rudder hydrodynamic force under the paddle-rudder system is calculated by a numerical calculation method, and the thickness distribution form of the curve S1 in the chord direction is used as a design result of the process a;
b, keeping the parameters of the length L, the width B, the maximum thickness T, the curve S1 and the curve S3 unchanged on the basis, taking the thickness distribution form of the curve S2 in the spanwise direction as an adjustment parameter, taking the maximum value of the negative pressure coefficient of the working surface of the rudder anti-corrosion electrode as a target function, calculating the rudder water power under the propeller-rudder system by using a numerical calculation method, and taking the thickness distribution form of the curve S1 in the spanwise direction as a design result of the process B;
c, keeping the parameters of the length L, the width B, the maximum thickness T, the curve S1 and the curve S2 unchanged on the basis, taking the geometric shape of the curve S3 as an adjusting parameter, minimizing the maximum value of the negative pressure coefficient of the rudder anti-corrosion electrode working surface as an objective function, calculating the rudder hydrodynamic force under the paddle-rudder system by using a numerical calculation method, and taking the geometric shape of the curve S3 as a design result of the process c;
and d, taking the design results of the process a, the process b and the process c as final parameters of the novel rudder anti-corrosion electrode.
2. The method for designing the novel corrosion-resistant electrode for the rudder according to claim 1, wherein when the novel corrosion-resistant electrode for the rudder is designed in the first step, the area of the working surface of the novel corrosion-resistant electrode is consistent with that of the flat-plate-shaped electrode, and the number of the novel corrosion-resistant electrode structures is the same as that of the flat-plate-shaped corrosion-resistant electrodes; the novel rudder anti-corrosion electrodes are uniformly distributed on the surface of the rudder blade so that the current density on the surface of the rudder blade is uniformly distributed.
3. The design method of the novel anti-corrosion electrode for the rudder of the ship as claimed in claim 1, wherein in the second step, the thickness distribution form of each section curve S1 in the chord direction is kept consistent, and the thickness distribution form of each section curve S2 in the span direction is kept consistent; making each section curve S3 have the same shape; the length L, the width B, the maximum thickness T, and the flat plate-like corrosion-resistant electrode are in agreement as initial data, the curves S1 and S2 are symmetric curves as initial data, and the curve S3 is an ellipse having a major axis L and a minor axis B as initial data.
4. The design method of the novel rudder anti-corrosion electrode is characterized in that the process c is followed by the following steps:
the process c1, keeping the working surface area of the rudder anti-corrosion electrode consistent with that of the original flat anti-corrosion electrode, and taking different values for the length L, the width B and the maximum thickness T;
and c2, aiming at various geometric schemes obtained in the c1, repeating the process a, the process b and the process c to optimally design the parameters S1, S2 and S3, forming a multi-objective function by minimizing the maximum negative pressure coefficient of the rudder anti-corrosion electrode working surface and the rudder resistance, and solving by a least square method to obtain the optimal anti-corrosion electrode geometric shape.
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| CN101155727A (en) * | 2005-04-11 | 2008-04-02 | 空中客车德国有限公司 | Reduction of frictional losses in the region of boundary layers on surfaces, around which a fluid flows |
| EP2562075A1 (en) * | 2011-08-24 | 2013-02-27 | Zuei-Ling Lin | Rudder resistance reducing method |
| CN107391865A (en) * | 2017-07-31 | 2017-11-24 | 中国人民解放军海军工程大学 | Rudder blade end suppresses the kuppe and its design method of fluid separation and cavitation |
| CN107672770A (en) * | 2017-11-01 | 2018-02-09 | 中国人民解放军海军工程大学 | A kind of mounting structure of rudder anticorrosion electrode |
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