CN115042947A - Twisted wing type sail and design method thereof - Google Patents
Twisted wing type sail and design method thereof Download PDFInfo
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- CN115042947A CN115042947A CN202210740901.9A CN202210740901A CN115042947A CN 115042947 A CN115042947 A CN 115042947A CN 202210740901 A CN202210740901 A CN 202210740901A CN 115042947 A CN115042947 A CN 115042947A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H9/00—Marine propulsion provided directly by wind power
- B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
- B63H9/06—Types of sail; Constructional features of sails; Arrangements thereof on vessels
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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
Abstract
The invention relates to a twisted wing type sail and a design method thereof.A layout position of the mounted twisted wing type sail on a deck and a corresponding allowed maximum chord length are determined; determining an absolute wind speed range encountered during operation and navigation when a target ship is not provided with a twisted wing sail, and determining a relative wind speed Uref range during assisted navigation of the sail according to the operation and navigation speed of the target ship; evaluating the number of wing type sails installed on an operating route and the corresponding size of a side projection area; calculating the height of the airfoil sail according to the determined maximum chord length and the determined side projection area; calculating the twist angle alpha of the profile of the airfoil sail at each vertical height relative to the profile of the lowermost end of the airfoil sail; the vertical continuous smooth twisted sail surface of the formed airfoil sail.
Description
Technical Field
The invention relates to the technical field of ships, in particular to a twisted wing type sail and a design method thereof.
Background
The wing type sail realizes boosting by utilizing a thrust component generated in the advancing direction of a ship by aerodynamic force generated by the sail under an airflow attack angle.
Due to the existence of the sea surface, the wind at sea is gradient wind, namely, the wind speed is continuously increased from the sea level to the upper direction in the vertical height. When the ship sails at a certain navigational speed, the relative wind speeds and the relative wind directions at different heights above the deck surface of the ship are different according to the speed triangle rule. Under the condition, the vertical maximum height of the added conventional airfoil-shaped sail for the ship is often more than 30m-50m, and the section airflow attack angles of the sail at different heights are different. Therefore, aerodynamic characteristics, especially thrust characteristics, of the wind sail sections at different heights cannot be optimized simultaneously, and due to the stall influence, the aerodynamic characteristics of some height sections and even the aerodynamic characteristics are greatly reduced, so that the maximum boosting effect of the wind sail sections at different heights cannot be exerted correspondingly.
Disclosure of Invention
The applicant provides a twisted wing-shaped sail with a reasonable structure and a design method thereof aiming at the defects in the prior art, and can fully utilize twisted gradient wind synthesized by the ship speed and the ground gradient wind profile in the vertical direction of the ship, so that the horizontal profiles of all vertical positions of the device are the optimal sail attack angles, the optimal state can be achieved, the maximum boosting force can be generated, the propulsion effect of the device is further developed, the power output of a ship main engine and the emission reduction of greenhouse gases are reduced, and the economy and the environmental protection performance of the ship are greatly improved.
The technical scheme adopted by the invention is as follows:
a design method of a twisted wing sail comprises the following steps:
determining the arrangement position of the installed twisted wing type sail on a deck and the corresponding allowed maximum chord length according to the overall arrangement of a target ship and the driving sight requirement of the international shipping convention;
determining the absolute wind speed range encountered during operation navigation when the target ship is not provided with the twisted wing-shaped sail, and determining the relative wind speed U of the sail during boosting navigation according to the operation speed of the target ship ref A range;
evaluating the number of wing type sails installed on an operating route and the corresponding size of a side projection area;
calculating the height of the airfoil sail according to the determined maximum chord length and the determined side projection area;
according to the operating speed U of the target ship Ship with a detachable hull Offshore wind profile U of commercial course T (h) Calculating the twist angle alpha of the airfoil sail section at each vertical height relative to the section at the lowest end of the airfoil sail;
the method specifically comprises the following steps of calculating the twist angle alpha of the airfoil sail section at each vertical height relative to the lowermost end section of the airfoil sail:
assuming that the atmospheric wind profile experienced by a typical operating route of a ship meets the 1/8 exponential distribution, the wind speeds at different vertical heights may be determined as follows:
wherein z is the vertical height from sea level, U 10 Is the wind speed U at a vertical height of 10m from the sea level Z The wind speed is the wind speed at the position with the vertical height z from the sea level;
recording the vertical height of the lowest edge of the sail from the sea level as Z down The absolute wind direction of the incoming wind is the same as the absolute wind direction at a height of 10m, and is denoted by psi, and the absolute wind speed U at that position down Can be determined according to equation 1; recording the speed of the ship as U Ship with a detachable hull Then the relative wind speed and the relative wind direction angle at the lowest edge of the sail are determined according to the speed threeThe angle rule determines that the following relation is satisfied:
taking the lowest edge of the sail as a reference, the deviation between the relative wind direction angle of the incoming wind at different vertical heights and the relative wind direction angle of the incoming wind at the lowest edge is a designed twisted angle; the relative wind speed and direction of the section at height i from the lowest position of the sail are calculated as follows:
the twist angle alpha of the sail section at the vertical height i from the lower edge of the sail relative to the lowest edge section of the sail is as follows:
α＝ψ ai -ψ adown (7)
forming a vertical continuous smooth twisted sail surface of the airfoil sail according to the twist angle alpha of each height position of the airfoil sail;
and the outer dimensions of the upper end plate and the lower end plate of the twisted wing type sail are designed.
The relative wind speed and the relative wind direction angle are the wind speed and the wind direction sensed in the moving ship body and are the composition of the ship speed and the ground wind speed.
The evaluation of the number of sails to be installed on the operating route and the influence factors of the projection area of the corresponding side of the sails comprises the following steps: the expected investment recovery period of shipowners, fuel economy of the airfoil sail with aspect ratio at different ship draught/speed and fuel market price.
Combined with maximum relative wind speed U ref The corresponding torque and power in the range of the operation attack angle are smaller than the maximum torque and power of the equipment.
The external dimensions of the upper end plate and the lower end plate of the twisted wing type sail are determined by CFD computational fluid dynamics or by data existing in the industry.
A twisted wing type sail comprises a base, and a sail surface is arranged at the top of the base.
The base is provided with a driving motor, and the driving motor is connected with the sail surface through a gear pair; the output shaft of the driving motor is connected with a driving wheel, the bottom of the sail surface is led out of the mast, and a driven wheel is coaxially arranged on the mast.
As a further improvement of the above technical solution:
the top and the bottom of the sail surface are respectively provided with an upper end plate and a lower end plate.
The invention has the following beneficial effects:
based on the speed triangle rule, according to the operating speed of a sailing ship and the characteristics of the gradient incoming wind profile, the scheme of the twisted airfoil-shaped sail can ensure that the airfoil-shaped sail profiles at different heights reach the optimal airflow attack angle while meeting the arrangement of a convention, so that the aerodynamic characteristics of the airfoil-shaped sail profiles at all heights can reach the optimal, and the boosting effect of the sail is improved to the maximum extent on the whole.
The end plates are additionally arranged at the upper end part and the lower end part of the wing-shaped sail, so that the end flow separation of the wing-shaped sail is effectively inhibited, the aerodynamic characteristics of the upper end part and the lower end part can be effectively improved, and the integral boosting effect of the sail is further improved.
The scheme of the twisted wing type sail fully utilizes the characteristics of fluid dynamics, has excellent boosting characteristic, can obviously reduce the output power of a ship propulsion host, reduces the fuel consumption and the emission of greenhouse gases, improves the boosting economy and the environmental protection of the sail, and has wide engineering application prospect.
Drawings
Fig. 1 is a schematic view of thrust generation of an airfoil sail.
Fig. 2 is a plot of lift coefficient versus angle of attack.
FIG. 3 is a diagram illustrating the analysis of the relative wind direction angles of the sea gradient wind profile encountered by a real ship and the profile of a conventional airfoil type sail.
Fig. 4 is a perspective view of an airfoil sail according to the present invention.
Fig. 5 is a top view of the airfoil sail of the present invention, in perspective view for the sake of viewing the structure.
Fig. 6 is a front view of an airfoil sail according to the invention.
Fig. 7-1 and 7-2 are schematic views of the airfoil sail of the present invention installed on a vessel.
Fig. 8 is a flow chart of the aerodynamic profile design of the twisted airfoil sail.
FIG. 9 is a block diagram of the process for determining the twist angle of the airfoil profile at each vertical height.
Wherein: 1. an upper end plate; 2. a sail surface; 3. a lower end plate; 4. a mast; 5. a driving wheel; 6. a driven wheel; 7. a drive motor; 8. a base; 9. a cab; 10. a ship body deck.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 to 9, the method for designing a twisted airfoil sail of the present embodiment includes the following steps:
determining the arrangement position of the installed twisted wing type sail on a deck and the corresponding allowed maximum chord length according to the overall arrangement of a target ship and the driving sight requirement of the international shipping convention;
determining the absolute wind speed range encountered by operation navigation when the target ship is not provided with the twisted wing-shaped sail, and determining the relative wind speed U of the sail during boosting navigation according to the operation speed of the target ship ref A range;
evaluating the number of wing type sails installed on an operating route and the corresponding size of a side projection area;
calculating the height of the airfoil sail according to the determined maximum chord length and the determined side projection area;
according to the operating speed U of the target ship Ship with a detachable hull Offshore wind profile U of commercial airline T (h) Calculating the twist angle alpha of the profile of the airfoil sail at each vertical height relative to the profile of the lowest end of the airfoil sail;
the method specifically comprises the following steps of calculating the twist angle alpha of the airfoil sail section at each vertical height relative to the lowermost end section of the airfoil sail:
assuming that the atmospheric wind profile experienced by a typical operating route of a ship meets the 1/8 exponential distribution, the wind speeds at different vertical heights may be determined as follows:
wherein z is the vertical height from sea level, U 10 Is the wind speed U at a vertical height of 10m from the sea level Z The wind speed is the wind speed at the position with the vertical height z from the sea level;
recording the vertical height of the lowest edge of the sail from the sea level as Z down The absolute wind direction of the incoming wind is the same as the absolute wind direction at a height of 10m, and is denoted by psi, and the absolute wind speed U at that position down Can be determined according to equation 1; recording the speed of the ship as U Ship with a detachable hull Then, the relative wind speed and the relative wind direction angle at the lowest edge of the sail are determined according to the speed triangle rule, and the following relationship is satisfied:
taking the lowest edge of the sail as a reference, the deviation between the relative wind direction angle of the incoming wind at different vertical heights and the relative wind direction angle of the incoming wind at the lowest edge is a designed twisted angle; the relative wind speed and direction of the section at height i from the lowest position of the sail are calculated as follows:
the twist angle alpha of the sail section at the vertical height i from the lower edge of the sail relative to the lowest edge section of the sail is as follows:
α＝ψ ai -ψ adown (7)
according to the twist angle alpha of each height position of the airfoil sail, a vertical continuous smooth twisted sail surface 2 of the airfoil sail is formed;
and the external dimensions of the upper end plate 1 and the lower end plate 3 of the twisted wing type sail are designed.
The relative wind speed and the relative wind direction angle are the wind speed and the wind direction sensed in the moving ship body and are the composition of the ship speed and the ground wind speed.
The evaluation of the number of sails to be installed on the operating route and the influence factors of the projection area of the corresponding side of the sails comprises the following steps: the expected investment recovery period of shipowners, fuel economy of the airfoil sail with aspect ratio at different ship draught/speed and fuel market price.
Combined with maximum relative wind speed U ref The corresponding torque and power in the range of the operation attack angle are smaller than the maximum torque and power of the equipment.
The external dimensions of the upper end plate 1 and the lower end plate 3 of the twisted wing type sail are determined by CFD computational fluid dynamics or by data existing in the industry.
The twisted wing type sail designed by the embodiment comprises a base 8, a sail surface 2 is arranged at the top of the base 8, a driving motor 7 is arranged on the base 8, and the driving motor 7 is connected with the sail surface 2 through a gear pair; the output shaft of the driving motor 7 is connected with a driving wheel 5, the bottom of the sail surface 2 is led out of a mast 4, and a driven wheel 6 is coaxially arranged on the mast 4.
The top and bottom of the sail surface 2 are provided with an upper end plate 1 and a lower end plate 3 respectively.
The idea of the invention is as follows:
fig. 1 is a schematic diagram of the principle of thrust generation of an airfoil sail, and fig. 2 is a curve of aerodynamic characteristics of a typical airfoil sail solution as a function of an angle of attack. In fig. 2, the abscissa represents the angle of attack of the sail and the ordinate represents the non-dimensional lift coefficient.
Referring to fig. 3, the wind on the sea surface is gradient wind, that is, the wind speed increases continuously from the sea level to the top in the vertical height, and when the ship sails at a certain sailing speed, the relative wind speed and the relative wind direction at different heights above the deck surface of the ship are different according to the speed triangle rule. Under this condition, the wind sail section angle of attack at different heights is different for the added conventional wing type wind sail for ship. Sailing at the speed of 12kn in the designed draft state of the ship and receiving the wind speed U at the height of 10m above the sea level and with the absolute wind direction angle of 90 DEG 10 For example, the deviation of the relative wind direction angle of the lowest edge and the highest edge of the sail exceeds 5 degrees, so that the aerodynamic characteristics, especially the thrust characteristics, of the sail sections at different heights cannot be simultaneously optimized, and due to the stall influence, the aerodynamic characteristics of some height sections and even the aerodynamic characteristics are greatly reduced, and correspondingly, the maximum boosting effect of the sail sections at different heights cannot be exerted.
Therefore, the invention provides a method for designing the scheme of the twisted wing type sail device according to the theoretical analysis of the fluid dynamic characteristics. By applying the method, the designed scheme of the twisted wing type sail can ensure that the cross sections at different heights can obtain the optimal attack angle on the premise that the arrangement meets the driving sight requirement in the international convention, thereby fully playing the boosting effect of the cross sections at different heights in the vertical direction, realizing the high-efficiency boosting of the whole device under the condition of wind, reducing the output power and the fuel consumption of a ship propulsion host, discharging greenhouse gases, and improving the economy, the environmental protection and the engineering application value of the device.
In one embodiment of the invention, the specific steps are as follows:
s1, determining the arrangement position of the twisted wing type sail to be installed on the deck and the corresponding allowed maximum chord length according to the overall arrangement of the target ship and the driving sight requirement of the international shipping convention;
s2, determining an absolute wind speed range encountered during operation and navigation when the target ship is not provided with the twisted wing type sail according to historical wind field data statistics of a typical operation route of the target ship; further, the relative wind speed U of the sail boosting operation is determined according to the operating speed of the ship ref The range can provide basis for checking the structural strength of the system;
s3, evaluating the number of airfoil sails to be installed on a typical operation route and the projection area size of the corresponding side according to the expected investment recovery period of the shipowner, the fuel economy and the fuel market price of the airfoil sails with different aspect ratios obtained based on S2 at different ship draught/sailing speeds and the like;
s4, calculating the height of the airfoil sail according to the maximum chord length determined in S1 and the side projection area determined in S3;
s5, according to the operating speed U of the ship Ship with a detachable hull Typical operation course offshore wind profile U T (h) And calculating the twist angles of the airfoil sail sections with different vertical heights compared with the section at the lowest end, wherein the specific flow is as follows:
assuming that the atmospheric wind profile experienced by a typical operating route of a ship meets the 1/8 exponential distribution, the wind speeds at different vertical heights may be determined as follows:
wherein z is the vertical height from sea level, U 10 Is the wind speed U at a vertical height of 10m from the sea level Z The wind speed is the wind speed at the vertical height z from the sea level.
Recording the vertical height of the lowest edge of the sail from the sea level as Z down The absolute wind direction of the incoming wind is the same as the absolute wind direction at a height of 10m, and is denoted by psi,where the absolute wind speed U down Can be determined according to equation (1); recording the speed of the ship as U Ship with a detachable hull Then the relative wind speed and the relative wind direction angle at the lowest edge of the sail can be determined according to the velocity triangle rule (the relative wind speed and the relative wind direction angle are the wind speed and the wind direction perceived in the moving hull, and are the combination of the ship speed and the earth wind speed), specifically:
and taking the lowest edge of the sail as a reference, and determining the deviation between the relative wind direction angle of the incoming wind at different vertical heights and the relative wind direction angle of the incoming wind at the lowest edge as a designed torsion angle. For example, the relative wind speed and direction along the profile at height i from the lowermost sail are calculated as follows:
the twist angle alpha of the sail section at the vertical height i from the lower edge of the sail relative to the lowest edge section of the sail is as follows:
α＝ψ ai -ψ adown (7)
by analogy, the twist angles of the wing-shaped sail at different vertical heights can be obtained, and a vertical continuous smooth twisted sail surface can be obtained.
And S6, designing the external dimensions of the upper end plate and the lower end plate of the twisted wing type sail for inhibiting the end streaming of the sail, wherein the external dimensions can be determined by experience or a traditional CFD (computational fluid dynamics) method.
One embodiment of the present invention calculates the process as follows:
s1, twisting the wing-shaped sail to be arranged in an area outside the sight line range according to the requirement of international convention on the sight line of driving from the front of a pilot tower, and not influencing the normal driving operation of the ship; in order to ensure the structural strength of the installation foundation, the installation position of the sail is selected at the transverse bulkhead of the ship body;
s2, taking the statistical wind field data of the main global marine route as an example, the wind speed range encountered by the normal operating route of the ship is 0-17.5 m/S, and the wind speed is the wind speed at the height of 10m from the sea surface. Further, taking the average operating speed of the target ship as 12kn as an example, the maximum relative wind speed on the ship is as follows:
17.5+12×0.5144＝23.7m/s；
s3, determining that the wind speed statistics meets structural strength, typical course energy-saving indexes, no-exceeding driving device torque and the like by using the S2, and determining that the chord length of the airfoil sail is 14.6m and the span length is 50.0 m;
s4, assuming that the absolute wind speed at the position 10m away from the sea surface is 10m/S, the absolute wind direction angle is 90 degrees, the lower edge height of the sail is 10.85m away from the sea surface, and the relative wind directions of the lower end and the upper end of the sail are 58.6 degrees and 63.8 degrees according to the height of the airfoil profile sail being 50.0m, so that the twist angles of the airfoil profiles of the upper end surface and the lower end surface are given. Similarly, the profile of the airfoil sail with each height can be obtained as an angle to be twisted for obtaining the optimal sail attack angle, so that the outline of the twisted airfoil sail can be obtained; as shown in fig. 4-6.
S5, determining the dimensions of the upper and lower end plates according to experience or conventional CFD methods.
After the design is completed, the mounting structure is shown in fig. 7.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (8)
1. A design method of a twisted wing sail is characterized by comprising the following steps:
determining the arrangement position of the installed twisted wing type sail on a deck and the corresponding allowed maximum chord length according to the overall arrangement of a target ship and the driving sight requirement of the international shipping convention;
determining the absolute wind speed range encountered during operation navigation when the target ship is not provided with the twisted wing-shaped sail, and determining the relative wind speed U of the sail during boosting navigation according to the operation speed of the target ship ref A range;
evaluating the number of wing type sails installed on an operating route and the corresponding size of a side projection area;
calculating the height of the airfoil sail according to the determined maximum chord length and the determined side projection area;
according to the operating speed U of the target ship Ship with a detachable hull Offshore wind profile U of commercial course T (h) Calculating the twist angle alpha of the profile of the airfoil sail at each vertical height relative to the profile of the lowest end of the airfoil sail;
according to the twist angle alpha of each height position of the airfoil sail, a vertical continuous smooth twisted sail surface (2) of the airfoil sail is formed;
and the external dimensions of the upper end plate and the lower end plate (3) of the twisted wing type sail are designed.
2. The method of designing a twisted airfoil sail as claimed in claim 1, wherein: the method specifically comprises the following steps of calculating the twist angle alpha of the airfoil sail section at each vertical height relative to the lowermost end section of the airfoil sail:
assuming that the atmospheric wind profile experienced by a typical operating route of a ship meets the 1/8 exponential distribution, the wind speeds at different vertical heights may be determined as follows:
wherein z is the vertical height from sea level, U 10 Is the wind speed U at a vertical height of 10m from the sea level Z The wind speed is the wind speed at the position with the vertical height z from the sea level;
recording the distance between the lowest edges of the sailsThe vertical height from the sea level is Z down The absolute wind direction of the incoming wind is the same as the absolute wind direction at a height of 10m, and is denoted by psi, and the absolute wind speed U at that position down Can be determined according to equation (1); recording the speed of the ship as U Ship with a detachable hull Then, the relative wind speed and the relative wind direction angle at the lowest edge of the sail are determined according to the speed triangle rule, and the following relationship is satisfied:
taking the lowest edge of the sail as a reference, the deviation between the relative wind direction angle of the incoming wind at different vertical heights and the relative wind direction angle of the incoming wind at the lowest edge is a designed twisted angle; the relative wind speed and direction of the section at height i from the lowest position of the sail are calculated as follows:
the twist angle alpha of the sail section at the vertical height i from the lower edge of the sail relative to the lowest edge section of the sail is as follows:
α＝ψ ai -ψ adown (7)
3. the method for designing a twisted airfoil sail, as set forth in claim 2, wherein: the relative wind speed and the relative wind direction angle are the wind speed and the wind direction sensed in the moving ship body and are the composition of the ship speed and the ground wind speed.
4. The method of designing a twisted airfoil sail as claimed in claim 1, wherein: the evaluation of the number of the sails to be installed on the operating route and the influence factors of the projection area of the corresponding side of the sails comprise the following steps: the desired return on investment period of shipdrivers, the fuel economy of the wing profile sail related to the aspect ratio at different ship draught/sailing speeds and the fuel market price.
5. The method of designing a twisted airfoil sail as claimed in claim 1, wherein: combined with maximum relative wind speed U ref The corresponding torque and power within the range of the operation attack angle of the wing-shaped sail shape and the operation attack angle are smaller than the maximum torque and power of the equipment.
6. The method of designing a twisted airfoil sail as claimed in claim 1, wherein: the external dimensions of the upper end plate and the lower end plate (3) of the twisted wing type sail are determined by CFD computational fluid dynamics or by the data existing in the industry.
7. A twisted aerofoil sail designed by the design method as claimed in claim 1, comprising a base (8), wherein the top of the base (8) is provided with a sail surface (2),
the base (8) is provided with a driving motor (7), and the driving motor (7) is connected with the sail surface (2) through a gear pair; the output shaft of the driving motor (7) is connected with a driving wheel (5), the bottom of the sail surface (2) leads out a mast (4), and a driven wheel (6) is coaxially arranged on the mast (4).
8. The method of designing a twisted airfoil sail as defined in claim 7, wherein: the top and the bottom of the sail surface (2) are respectively provided with an upper end plate (1) and a lower end plate (3).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012240540A (en) * | 2011-05-18 | 2012-12-10 | Mitsui Eng & Shipbuild Co Ltd | Ship having square sail formed with hard sail, and method for accommodating and deploying square sail |
| CN106976539A (en) * | 2017-04-25 | 2017-07-25 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Cartridge type sail peculiar to vessel |
| CN107651148A (en) * | 2017-09-26 | 2018-02-02 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Trigonometric expression sail |
| CN111532409A (en) * | 2020-05-15 | 2020-08-14 | 宁波大学 | Lifting type rotary cylinder sail device and using method |
| CN112124547A (en) * | 2020-10-21 | 2020-12-25 | 中国船舶科学研究中心 | Wing type sail |
| CN213800133U (en) * | 2020-10-21 | 2021-07-27 | 中国船舶科学研究中心 | Wing type sail |
-
2022
- 2022-06-28 CN CN202210740901.9A patent/CN115042947B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012240540A (en) * | 2011-05-18 | 2012-12-10 | Mitsui Eng & Shipbuild Co Ltd | Ship having square sail formed with hard sail, and method for accommodating and deploying square sail |
| CN106976539A (en) * | 2017-04-25 | 2017-07-25 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Cartridge type sail peculiar to vessel |
| CN107651148A (en) * | 2017-09-26 | 2018-02-02 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Trigonometric expression sail |
| CN111532409A (en) * | 2020-05-15 | 2020-08-14 | 宁波大学 | Lifting type rotary cylinder sail device and using method |
| CN112124547A (en) * | 2020-10-21 | 2020-12-25 | 中国船舶科学研究中心 | Wing type sail |
| CN213800133U (en) * | 2020-10-21 | 2021-07-27 | 中国船舶科学研究中心 | Wing type sail |
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