CN107391865A - Rudder blade end suppresses the kuppe and its design method of fluid separation and cavitation - Google Patents
Rudder blade end suppresses the kuppe and its design method of fluid separation and cavitation Download PDFInfo
- Publication number
- CN107391865A CN107391865A CN201710635666.8A CN201710635666A CN107391865A CN 107391865 A CN107391865 A CN 107391865A CN 201710635666 A CN201710635666 A CN 201710635666A CN 107391865 A CN107391865 A CN 107391865A
- Authority
- CN
- China
- Prior art keywords
- kuppe
- rudder blade
- cavitation
- section
- rudder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Automation & Control Theory (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention belongs to Ship Design field, more particularly to a kind of rudder blade end to suppress the kuppe and its design method of fluid separation and cavitation.A kind of rudder blade end suppresses the kuppe of fluid separation and cavitation, and the kuppe is located at rudder blade end, surface smoothing, and the edge wheel profile of the kuppe overlaps with the sideline of rudder blade end face, and with rudder blade surface smoothing transition.The kuppe can improve the Flow Field Distribution near rudder blade end, suppress the fluid separation near rudder blade lower surface, the anti-cavitation performance of rudder blade lower surface is improved, further avoids the cavitation of rudder blade end from degrading, reduces rudder blade lower surface vibration and noise caused by cavitation and separation whirlpool.
Description
Technical field
The invention belongs to Ship Design field, more particularly to a kind of rudder blade end to suppress the kuppe of fluid separation and cavitation
And its design method.
Background technology
Rudder for ship is the infrastructure device for being used to control direction of ship travel on ship, and the lower surface of traditional marine rudder is plane,
Shape distortion about is formed into 90 degree of angles with rudder blade face blade back, causes fluid separation easily occurs in rudder end, is formed very strong
Whirlpool is separated, separation whirlpool can not only cause vibration and noise, and cause rudder end that cavitation occurs in the relatively low speed of a ship or plane, produce cavitation
Degrade, increase the maintenance cost of rudder, reduce the service life of rudder, rudder end cavitation can also be further exacerbated by the vibration of rudder and make an uproar
Sound.Rudder vacuole reality ship observed result and rudder vacuole model test observed result show that the cavitation of plane rudder lower surface rises
The beginning speed of a ship or plane is more much lower than rudder blade surface cavitation, and general waterborne vessel has just produced bright in 18Kn or so cruising speed lower rudder end face
Aobvious cavitation.
The content of the invention
For above-mentioned present situation, it is an object of the invention to provide the water conservancy diversion that a kind of rudder blade end suppresses fluid separation and cavitation
Cover and its design method, the kuppe can improve the Flow Field Distribution near rudder blade end, suppress the fluid separation of rudder blade end,
The possibility that cavitation occurs for the position is reduced, improves the combination property of rudder for ship.
To achieve the above object, the invention adopts the following technical scheme that.
A kind of rudder blade end suppresses the kuppe of fluid separation and cavitation, and the kuppe is located at rudder blade end, surface light
Suitable, the edge wheel profile of the kuppe overlaps with the sideline of rudder blade end face, and with rudder blade surface smoothing transition.The kuppe
The Flow Field Distribution near rudder blade end can be improved, suppress the fluid separation near rudder blade lower surface, improve rudder blade lower surface
Anti-cavitation performance, further avoid the cavitation of rudder blade end from degrading, reduce rudder blade lower surface and shaken caused by cavitation and separation whirlpool
Dynamic and noise.
Further, each chordwise location vertical profile of kuppe (is gone with the plane perpendicular to rudder blade lower end section line of symmetry
The obtained section of interception kuppe) shape is to make each section negative pressure force coefficientThe minimum section shape of peak value value, it is described negative
The definition of pressure coefficient is：Wherein p be kuppe surface pressure, p0For reference pressure, ρ is density of sea water,
VSFor ship speed.Negative pressure force coefficient is calculated by using above-mentioned parameter, in that context it may be convenient to which various kuppes are designed
Model carries out comparing calculation, obtains the shape data for making rudder blade obtain optimum performance.
When quickly being designed, the sectional elevation of kuppe at each chordwise location can be made to be semicircle or
Half elliptic, for half elliptic when the half elliptic transverse axis be consistently equal to rudder blade lower end section at the chord length
Thickness.On the basis of design requirement is met, by taking above-mentioned parameter quickly to be designed, kuppe can be simplified and designed
Journey, decide whether to also need to carry out further optimization design to section shape further according to the design result of the parameter.
Further, the inside of the kuppe is hollow-core construction.By setting the kuppe of hollow-core construction, can reduce
Rudder for ship weight, while materials'use amount is reduced, reduce production and rise this.
As needed, light material can be utilized to fill to reduce rudder for ship weight or further be set in kuppe inner chamber
Stiffener plate is put, to ensure the intensity of hollow kuppe.
It is possible to further make kuppe and rudder blade be integrally machined shaping.By making rudder blade be integrally machined design, can keep away
Exempt from joint portion and produce extra abnormal flow field, optimization rudder for ship overall Flow Field Distribution and anti-cavitation effect, it is overall to improve rudder for ship
Performance.
A kind of rudder blade end suppresses the design method of the kuppe of fluid separation and cavitation, comprises the following steps：
Step 1：Keep body contours and the structure of rudder blade constant, the outline of rudder blade is modeled；
Step 2：Install the kuppe model of geometric smoothness, adjustment kuppe model ginseng additional in the end of rudder blade geometrical model
Number, overlaps the sideline of kuppe model and the sideline of the installation section of rudder blade model, water conservancy diversion cover outer surface and rudder blade surface light
Along connection；
Step 3：The tail flow field of propeller is calculated by numerical computation method, the tail flow field data include wake flow speed
Direction and the distribution of velocity magnitude；
Step 4：Kuppe sideline is kept to be overlapped with rudder blade end edge line, face and rudder blade surface smoothing outside kuppe
On the basis of connection, each chordwise location sectional elevation of kuppe is adjusted (with the plane perpendicular to rudder blade lower end section line of symmetry
Go to intercept the obtained section of kuppe) geometry, obtain different kuppe schemes；
Step 5：By three-dimensional panel method calculate 0 ° of rudder angle when rudder blade surface and kuppe surface pressure p distribution and
Corresponding negative pressure force coefficientExtract the negative pressure force coefficient on each sectional elevation of kuppePeak value, negative pressure force coefficient determines
Justice is：Wherein p be kuppe surface pressure, p0For reference pressure, ρ is density of sea water, VSNavigated for ship
Speed；By optimizing design to the line style of kuppe section, acquisition makes corresponding on each sectional elevation of kuppePeak value value
Minimum optimal line style data, process kuppe based on above-mentioned each optimal line style data of kuppe, are then attached to rudder blade
End.
Further, during specific design, said process can be simplified according to the design needs, such as right
Spot ship carries out technological improvement, in actual design process, rudder blade can not be modeled, it is only necessary to obtain rudder blade end
Sideline, kuppe sideline is overlapped with rudder blade sideline, the geometry in each chordwise location cross section of kuppe is carried out afterwards
Optimization.
Further, during the actual optimization can according to step 4 and step 5 in obtain optimal case, can also
Carrying out simplifying design as needed, such as make at each chordwise location, the sectional elevation of kuppe is circular or half elliptic,
For half elliptic when, further optimization can also make the half elliptic transverse axis be consistently equal to rudder blade lower end section
Thickness at the chord length.
The kuppe of meet demand is can be designed that based on above-mentioned design method, needs to select entirely according to actual design
Portion has selected section process to solve the kuppe for meeting design requirement to perform, and data needed for the design method are less, lead to
Cross negative pressure force coefficient to contrast the design data of kuppe, can quickly optimize design, improve design efficiency.
Brief description of the drawings
Fig. 1 is structural representation of the kuppe on rudder blade in the present invention；
Fig. 2 is the first section shape schematic diagram of kuppe in the present invention；
Fig. 3 is second of section shape schematic diagram of kuppe in the present invention；
Fig. 4 is the third section shape schematic diagram of kuppe in the present invention.
Its reference includes：
Rudder blade 1；Kuppe 2；Sectional elevation 3；Half elliptic section sideline 4；Semi-circular cross-section sideline 5,51；It is asymmetric to cut open
Face sideline 6,61.
Embodiment
The invention is elaborated below in conjunction with specific embodiment and its design process.
As shown in fig. 1, a kind of end of rudder blade 1 suppresses the kuppe 2 of fluid separation and cavitation, and the kuppe 2 is located at
The end of rudder blade 1, the cross section of the kuppe 2 is streamlined geometric shape, the edge of the kuppe 2 and the table of rudder blade 1
Face fairing transition, the sideline of the kuppe 2 overlap with the sideline of the end of rudder blade 1.In practical application, can by welding or
The different connected modes such as bolt connection link together kuppe 2 and rudder blade 1.
Each chordwise location vertical profile of kuppe (is gone to intercept water conservancy diversion with the plane perpendicular to the lower end section line of symmetry of rudder blade 1
Cover obtained section) shape is to make each section negative pressure force coefficientThe minimum section shape of peak value value, the negative pressure force coefficient
Definition be：Wherein p be kuppe surface pressure, p0For reference pressure, ρ is density of sea water, VSFor ship
The speed of a ship or plane.
Preferably, as shown in Figure 2, at each chordwise location, the sectional elevation 3 of the kuppe 2 for it is semicircle (such as
Semi-circular cross-section sideline 4 in Fig. 2) or half elliptic (half as shown in half elliptic section sideline 5 in Fig. 2, Fig. 3 and dotted line
Oval sideline 51), for half elliptic when the half elliptic transverse axis be consistently equal to rudder blade 1 lower end section at this
Thickness at chord length.To simplify the design process of kuppe 2, on the basis of design requirement is met, above-mentioned parameter can be taken to carry out
Quick design.
For ease of the operation of rudder for ship, mitigate the quality of rudder for ship, reduce the material consumption of kuppe 2, ensure the intensity of kuppe 2
And on the premise of other characteristic requirements, the indoor design of kuppe 2 can be used hollow-core construction.For take into account mitigate quality with
And the demand of intensity is improved, kuppe 2 can be designed as to inside light material filling shell-like structure.The light material can
To be processed with the higher light metal of intensity or polymer substance, can also made of above-mentioned material or other materials reinforcement
To be supported.
A kind of end of rudder blade 1 suppresses the design method of the kuppe 2 of fluid separation and cavitation, comprises the following steps：
Step 1：Keep body contours and the structure of rudder blade 1 constant, the outline of rudder blade 1 is modeled；
Step 2：End in the mould geometric type of rudder blade 1 installs the model of kuppe 2 of geometric smoothness additional, makes the side of kuppe 2
Line overlaps with the sideline of the mould of rudder blade 1；
Step 3：The tail flow field of propeller is calculated by numerical computation method, the tail flow field data include wake flow speed
Direction and the distribution of velocity magnitude；
Step 4：Each chordwise location sectional elevation 3 of kuppe 2 is adjusted (with perpendicular to the lower end section line of symmetry of rudder blade 1
Plane goes to intercept the obtained section of kuppe 2) geometry, obtain the different schemes of kuppe 2, in actual design process,
Above-mentioned kuppe scheme has different choice according to actual conditions, is influenceed by tail flow field near rudder for ship, kuppe position both sides
Water (flow) direction, current size differ, therefore both sides discontinuity, therefore when kuppe is designed, kuppe erects
The profile of both sides is not necessarily symmetrical on straightforward face, i.e., under conditions of design requirement is met, the profile is likely to be in Fig. 2, Fig. 3
Semicircle or half elliptic, in further optimization process, its outline is also likely to be that unsymmetrical in Fig. 4 is (i.e. non-right
Claim section sideline 6 and 61)；
Step 5：The distribution of the pressure p on the surface of rudder blade 1 and the surface of kuppe 2 when calculating 0 ° of rudder angle by three-dimensional panel method
And corresponding negative pressure force coefficientExtract the negative pressure force coefficient on each sectional elevation 3 of kuppe 2Peak value, negative pressure force coefficient
Definition be：Wherein p be the surface of kuppe 2 pressure, p0It is that reference pressure (uses the self-defined ginseng compared
Number, it functions as coordinate origin, according to the parameter setting of rudder blade 1 or given according to being actually needed, and can also be set to 0),
ρ is density of sea water, VSFor ship speed；By being adjusted to the line style of the section of kuppe 2, during the adjustment, mainly
The sideline profile of each section is adjusted, acquisition makes corresponding on 2 each sectional elevation of kuppePeak value value minimum
Optimal line style data, process kuppe 2 based on the optimal line style data of the above-mentioned line style data of kuppe 2.
Further, during specific design, said process can be simplified according to the design needs, such as right
Spot ship carries out technological improvement, in actual design process, and rudder blade 1 need not be modeled, it is only necessary to obtain rudder blade 1
End sideline, the sideline of kuppe 2 is set to be overlapped with the sideline of rudder blade 1, afterwards to the geometric form in each chordwise location cross section of kuppe 2
Shape optimizes design.
During the actual optimization can according to step 4 and step 5 in obtain optimal case (in optimal case), also may be used
To carry out simplifying design as needed, such as make at each chordwise location, the sectional elevation 3 of kuppe 2 is circular or half is ellipse
Circle, when being half elliptic, further optimization can also make the transverse axis of the half elliptic be consistently equal to the lower end of rudder blade 1
Thickness of the section at the chord length.
Finally it should be noted that above example is only illustrating the technical scheme of the invention, rather than to this hair
The bright limitation for creating protection domain, it is most-often used when during design generally according to navigation because shipping sail speed is not fixed
The speed of a ship or plane, the situation of rudder angle (such as 0 ° of rudder angle be straight trip) be designed, the difference needed according to actual design is above-mentioned to be related to process
The parameter of design might have partial adjustment, but its design principle and thinking are identicals.Although with reference to preferred embodiment to this
Innovation and creation explain, it will be understood by those within the art that, can be to the technical side of the invention
Case is modified or equivalent substitution, without departing from the spirit and scope of the invention technical scheme.
Claims (9)
1. a kind of rudder blade end suppresses the kuppe of fluid separation and cavitation, it is characterised in that the kuppe is located at rudder blade end
Portion, surface smoothing, the edge wheel profile of the kuppe overlap with the sideline of rudder blade end face, and with rudder blade surface smoothing transition.
2. a kind of rudder blade end according to claim 1 suppresses the kuppe of fluid separation and cavitation, it is characterised in that kuppe
Each chordwise location vertical profile (section for going interception kuppe to obtain with the plane perpendicular to rudder blade lower end section line of symmetry) shape
Shape is to make each section negative pressure force coefficientThe minimum section shape of peak value value, the definition of the negative pressure force coefficient are：Wherein p be kuppe surface pressure, p0For reference pressure, ρ is density of sea water, VSFor ship speed.
3. a kind of rudder blade end according to claim 1 suppresses the kuppe of fluid separation and cavitation, it is characterised in that each
At chordwise location, the sectional elevation of the kuppe is semicircle or half elliptic.
4. a kind of rudder blade end according to claim 3 suppresses the kuppe of fluid separation and cavitation, it is characterised in that this is half ellipse
Circular transverse axis is consistently equal to thickness of the section of the lower end of rudder blade at the chord length.
5. a kind of rudder blade end according to claim 1 suppresses the kuppe of fluid separation and cavitation, it is characterised in that described to lead
The inside of stream cover is hollow-core construction, and the kuppe hollow part is provided with reinforcement or filled using light material.
6. a kind of rudder blade end according to claim 1 suppresses the kuppe of fluid separation and cavitation, it is characterised in that described to lead
Stream cover is integrally machined shaping with rudder blade.
7. a kind of rudder blade end suppresses the design method of the kuppe of fluid separation and cavitation, it is characterised in that including following step
Suddenly：
Step 1：Keep body contours and the structure of rudder blade constant, the outline of rudder blade is modeled；
Step 2：End on rudder blade model installs the kuppe model of geometric smoothness additional, makes sideline and the rudder of kuppe model
Ye Mo sideline overlaps；
Step 3：The tail flow field of propeller is calculated by numerical computation method, the tail flow field data include wake flow velocity attitude
With the distribution of velocity magnitude；
Step 4：Each chordwise location vertical profile of adjustment kuppe (is gone with the plane perpendicular to rudder blade lower end section line of symmetry
The obtained section of interception kuppe) geometry, obtain different kuppe schemes；
Step 5：The distribution of the pressure p on rudder blade surface and kuppe surface and corresponding when calculating 0 ° of rudder angle by three-dimensional panel method
Negative pressure force coefficientExtract the negative pressure force coefficient on each cross section of kuppePeak value, the definition of negative pressure force coefficient is：Wherein p be kuppe surface pressure, p0For reference pressure, ρ is density of sea water, VSFor ship speed；Pass through
The line style of kuppe section is adjusted, acquisition makes corresponding on each cross section of kuppeThe minimum optimal line style number of peak value value
According to；Kuppe is processed according to the kuppe design data of acquisition, is then attached to rudder blade end.
8. a kind of rudder blade end suppresses the design method of the kuppe of fluid separation and cavitation, it is characterised in that its step includes：
Step 1：Install the kuppe model of geometric smoothness additional in the end of rudder blade to be designed, make the sideline of kuppe model with
The sideline of rudder blade overlaps；
Step 2：The geometry in each chordwise location cross section of kuppe is adjusted, is made at each chordwise location, kuppe erects
Straight section is half elliptic, and the transverse axis of the half elliptic is consistently equal to thickness of the section of the lower end of rudder blade at the chord length；
Kuppe is processed according to the kuppe design data of acquisition, is then attached to rudder blade end.
9. a kind of rudder blade end suppresses the design method of the kuppe of fluid separation and cavitation, it is characterised in that its step includes：
Step 1：Install the kuppe model of geometric smoothness additional in the end of rudder blade to be designed, make the sideline of kuppe model with
The sideline of rudder blade overlaps；
Step 2：The geometry in each chordwise location cross section of kuppe is adjusted, is made at each chordwise location, kuppe erects
Straight section is semicircle；Kuppe is processed according to the kuppe design data of acquisition, is then attached to rudder blade end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710635666.8A CN107391865B (en) | 2017-07-31 | 2017-07-31 | Air guide sleeve for inhibiting fluid separation and cavitation at end part of rudder blade and design method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710635666.8A CN107391865B (en) | 2017-07-31 | 2017-07-31 | Air guide sleeve for inhibiting fluid separation and cavitation at end part of rudder blade and design method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107391865A true CN107391865A (en) | 2017-11-24 |
| CN107391865B CN107391865B (en) | 2021-08-06 |
Family
ID=60342355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710635666.8A Active CN107391865B (en) | 2017-07-31 | 2017-07-31 | Air guide sleeve for inhibiting fluid separation and cavitation at end part of rudder blade and design method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107391865B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109033645A (en) * | 2018-07-31 | 2018-12-18 | 中国人民解放军海军工程大学 | A kind of novel rudder for ship anticorrosion electrode and its design method |
| CN112429144A (en) * | 2020-12-01 | 2021-03-02 | 江南造船(集团)有限责任公司 | Air guide sleeve for improving dead-wood rear flow field of high-speed ship and installation method thereof |
| CN114194354A (en) * | 2021-12-10 | 2022-03-18 | 海鹰企业集团有限责任公司 | Design method of bionic type flow guide cover with noise reduction function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186233A (en) * | 2007-12-19 | 2008-05-28 | 沪东中华造船(集团)有限公司 | Method for reducing vessels stern semi-balance suspension rudder blade surface cavitation |
| CN101531249A (en) * | 2007-11-13 | 2009-09-16 | 贝克船舶系统有限及两合公司 | Rudder arrangement for ships with higher speeds with a cavitation reducing twisted rudder, in particular with a full-balanced rudder |
| KR20130072553A (en) * | 2011-12-22 | 2013-07-02 | 삼성중공업 주식회사 | Rudder and ship having the same |
| CN105416554A (en) * | 2015-12-24 | 2016-03-23 | 九成投资集团有限公司 | Rudder blade with curved guide edges |
-
2017
- 2017-07-31 CN CN201710635666.8A patent/CN107391865B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101531249A (en) * | 2007-11-13 | 2009-09-16 | 贝克船舶系统有限及两合公司 | Rudder arrangement for ships with higher speeds with a cavitation reducing twisted rudder, in particular with a full-balanced rudder |
| CN101186233A (en) * | 2007-12-19 | 2008-05-28 | 沪东中华造船(集团)有限公司 | Method for reducing vessels stern semi-balance suspension rudder blade surface cavitation |
| KR20130072553A (en) * | 2011-12-22 | 2013-07-02 | 삼성중공업 주식회사 | Rudder and ship having the same |
| CN105416554A (en) * | 2015-12-24 | 2016-03-23 | 九成投资集团有限公司 | Rudder blade with curved guide edges |
Non-Patent Citations (2)
| Title |
|---|
| MARIO FELLI 等: "Experimental analysis of the flow field around a propeller–rudder configuration", 《EXPERIMENTS IN FLUIDS》 * |
| 叶金铭 等: "抗空化扭曲舵的设计及其水动力性能分析", 《上海交通大学学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109033645A (en) * | 2018-07-31 | 2018-12-18 | 中国人民解放军海军工程大学 | A kind of novel rudder for ship anticorrosion electrode and its design method |
| CN109033645B (en) * | 2018-07-31 | 2023-04-07 | 中国人民解放军海军工程大学 | Novel rudder anti-corrosion electrode and design method thereof |
| CN112429144A (en) * | 2020-12-01 | 2021-03-02 | 江南造船(集团)有限责任公司 | Air guide sleeve for improving dead-wood rear flow field of high-speed ship and installation method thereof |
| CN114194354A (en) * | 2021-12-10 | 2022-03-18 | 海鹰企业集团有限责任公司 | Design method of bionic type flow guide cover with noise reduction function |
| CN114194354B (en) * | 2021-12-10 | 2024-01-23 | 海鹰企业集团有限责任公司 | Design method of bionic type air guide sleeve with noise reduction function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107391865B (en) | 2021-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202593838U (en) | Ship hydrodynamic front guide wheel energy-saving device | |
| CN107391865A (en) | Rudder blade end suppresses the kuppe and its design method of fluid separation and cavitation | |
| CN101434294B (en) | Rudder for ships | |
| JP4939269B2 (en) | Stern horizontal duct and ship | |
| US8028636B2 (en) | Stern shape of displacement-type marine vessel | |
| US5601047A (en) | Dualcavitating hydrofoil structures for multi-speed applications | |
| KR102386093B1 (en) | Thick airfoil shapes for blade necks and for blade cuff fairings for an aircraft rotor | |
| JP2014522778A (en) | Flow management of a duct with hydrodynamic properties at the bow of a ship | |
| CN104401475A (en) | Structure in combination of double vortex tail fins and tail shaft system of twin-propeller ship | |
| CN111498049B (en) | Mounting method of energy-saving stator | |
| KR102024176B1 (en) | Manufacturing method of twisted type rudder | |
| CN103324772B (en) | Single-curved surface wind screen nose integrated design method | |
| CN107264763B (en) | A kind of design method of anti-cavitation distortion rudder | |
| CN111776131B (en) | Superspeed water surface navigation ware based on syllogic supercavitation hydrofoil | |
| JP6041440B2 (en) | Fin device and ship | |
| JP2018165152A (en) | Vessel with compact size duct and determination method for application of compact size duct to vessel | |
| CN204433016U (en) | The unitized construction of the two whirlpool tail fin of a kind of r Zweier and tailing axle system | |
| CN103895850B (en) | A kind of combined energy-saving bracing strut device | |
| CN102336247B (en) | Wing flap fishtail fin | |
| KR101856865B1 (en) | energy saving device for twin skeg ship using hydrofoil | |
| KR101998285B1 (en) | Rudder for special ship | |
| CN205615697U (en) | Bionical fin fish tail rudder | |
| JP2004130908A (en) | Duct body of ship | |
| JP2649786B2 (en) | Propeller and method for determining its optimum shape | |
| JP4999384B2 (en) | Stern duct and ship with it |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |