Propulsion efficiency enhancement device

Abstract

This invention discloses a propulsion efficiency improvement device. An embodiment of this invention includes: a duct disposed in front of a propeller, formed in an arc shape and used to generate thrust; and a plurality of pre-spin stators supporting the duct to a stern boss portion for generating a swirling flow in the opposite direction to the propeller's rotation direction.

Description

[0001] This application is a divisional application of Chinese invention patent application No. 201880070528.2 (filed on October 31, 2018; invention title: propulsion efficiency improvement device). Technical Field

[0002] This invention relates to a device for improving propulsion efficiency. Background Technology

[0003] Recently, various technologies are being actively developed to reduce energy consumption during ship operation.

[0004] As an example of energy-saving technology, a duct is positioned in front of the propeller.

[0005] The duct allows flow to pass along the surface of the hull and move rearward, thereby generating additional thrust. In this case, the duct becomes a factor in increasing propulsion efficiency.

[0006] However, the catheter can also create resistance, which can reduce the efficiency of new cell delivery. Summary of the Invention

[0007] The technical challenge of this invention is to provide a device for improving propulsion efficiency.

[0008] To address the aforementioned technical challenges, one aspect of the propulsion efficiency enhancement device of the present invention provides a propulsion efficiency enhancement device comprising: a duct disposed in front of a propeller, formed in an arc shape and used to generate thrust; and a plurality of pre-spin stators supporting the duct to a stern boss portion for generating a swirling flow in the opposite direction to the rotation direction of the propeller.

[0009] The aforementioned duct can form a convex beam arch in the direction of the aforementioned stern boss, and the aforementioned plurality of pre-rotating stators can form a convex beam arch in the direction of rotation of the aforementioned propeller.

[0010] The aforementioned propulsion efficiency improvement device may further include: a first connecting portion for interconnecting the first end portion of the conduit in the rotation direction of the propeller and the first outer stator of the plurality of pre-spinning stators located at the last position in the rotation direction of the propeller; and a second connecting portion for interconnecting the second end portion of the conduit in the direction opposite to the rotation direction of the propeller and the second outer pre-spinning stator of the plurality of pre-spinning stators located at the last position in the direction opposite to the rotation direction of the propeller; wherein the first connecting portion may be formed in a shape that continuously connects the first end portion of the conduit with a beam arch shape and the first outer pre-spinning stator, and the second connecting portion may be formed in a shape that continuously connects the second end portion of the conduit with a beam arch shape and the second outer pre-spinning stator.

[0011] The aforementioned conduit can be formed in an arc shape that extends from the lower left region to the upper right region relative to the center line of the arc formed by the aforementioned conduit, and the aforementioned plurality of pre-rotating stators can be arranged at intervals of a certain distance from the lower left region to the upper right region relative to the center line of the arc formed by the aforementioned conduit.

[0012] The aforementioned propeller can rotate clockwise when viewed from the rear, and the number of pre-rotating stators located on the port side of the hull can be greater than the number of pre-rotating stators located on the starboard side.

[0013] The centerline of the arc formed by the aforementioned conduit can be located above the rotation axis of the aforementioned propeller.

[0014] The distance between the centerline of the arc formed by the aforementioned conduit and the rotation axis of the aforementioned propeller can be more than 0.1 times and less than 0.4 times the radius of the aforementioned propeller.

[0015] The aforementioned conduit can be located within the rotational area of ​​the aforementioned propeller.

[0016] Another aspect of the propulsion efficiency improvement device of the present invention may include: a plurality of pre-spin stators supported in front of the propeller by a stern boss for generating a swirling flow in the opposite direction to the rotation direction of the propeller; a duct supported by the end portions of the plurality of pre-spin stators, formed in an arc shape and used to generate thrust; and a connecting portion for interconnecting the duct and the pre-spin stators.

[0017] The aforementioned duct can form a convex beam arch in the direction of the aforementioned stern boss, and the aforementioned plurality of pre-rotating stators can form a convex beam arch in the direction of rotation of the aforementioned propeller.

[0018] The aforementioned connecting portion may further include: a first connecting portion for interconnecting the first end portion of the conduit in the rotation direction of the propeller and the first outer pre-spinning stator of the plurality of pre-spinning stators located at the last position in the rotation direction of the propeller; and a second connecting portion for interconnecting the second end portion of the conduit in the direction opposite to the rotation direction of the propeller and the second outer pre-spinning stator of the plurality of pre-spinning stators located at the last position in the direction opposite to the rotation direction of the propeller; wherein the first connecting portion may be formed in a shape that continuously connects the first end portion of the conduit with a beam arch shape and the first outer pre-spinning stator, and the second connecting portion may be formed in a shape that continuously connects the second end portion of the conduit with a beam arch shape and the second outer pre-spinning stator.

[0019] The first connecting part and the second connecting part can be combined after being manufactured independently relative to the conduit, the first outer pre-rotating stator and the second outer pre-rotating stator, respectively.

[0020] Another aspect of the propulsion efficiency improvement device of the present invention may include: a duct disposed in front of the propeller, formed in an arc shape and used to generate thrust; and a plurality of pre-spin stators supporting the duct to the stern boss portion for generating a swirling flow in the opposite direction to the rotation direction of the propeller; wherein the duct may be formed in a shape with a chord length that gradually changes from a first end portion in the rotation direction of the propeller to a second end portion in the opposite direction to the rotation direction of the propeller.

[0021] The first outer pre-spinning stator, located at the last position in the rotation direction of the propeller, can be formed with a chord length that gradually decreases from the root to the tip. The conduit can be formed with a chord length that first increases and then decreases from the first end portion in the rotation direction of the propeller to the second end portion in the opposite direction of the propeller's rotation. The second outer pre-spinning stator, located at the last position in the opposite direction of the propeller's rotation, can be formed with a chord length that gradually decreases from the root to the tip.

[0022] It may also include: a first connecting portion, located between the first end portion of the conduit in the rotation direction of the propeller and the first outer stator of the plurality of pre-rotating stators located at the last position in the rotation direction of the propeller; and a second connecting portion, located between the second end portion of the conduit in the opposite direction to the rotation direction of the propeller and the second outer pre-rotating stator of the plurality of pre-rotating stators located at the last position in the opposite direction to the rotation direction of the propeller; wherein the first connecting portion may be formed in a shape where the chord length decreases and then increases from the tip of the first outer stator to the first end portion of the conduit, and the second connecting portion may be formed in a shape where the chord length decreases and then increases from the tip of the second outer stator to the second end portion of the conduit.

[0023] In the unfolded diagram of the side facing the outside of the aforementioned conduit, the curve formed by the leading edge of the conduit can be formed with a single curvature.

[0024] Another aspect of the propulsion efficiency improvement device of the present invention may include: a duct disposed in front of the propeller, formed in an arc shape and used to generate thrust; and a plurality of pre-spin stators supporting the duct to the stern boss portion for generating a swirling flow in the opposite direction to the rotation direction of the propeller; wherein the plurality of pre-spin stators are located at different positions along the length of the hull.

[0025] The inner pre-spinning stator, located between the first outer pre-spinning stator at the last position in the direction of rotation of the propeller and the second outer pre-spinning stator at the last position in the opposite direction of rotation of the propeller, can be located in front of the first outer pre-spinning stator and the second outer pre-spinning stator.

[0026] The number of the aforementioned inner pre-rotating stators can be one or more, and the front end of the tip of the aforementioned inner pre-rotating stator fixed on the inner side of the aforementioned conduit can be located behind the front edge of the aforementioned conduit, while its rear end can be located in front of the rear edge of the aforementioned conduit.

[0027] The root and tip of the aforementioned inner pre-spinning stator, the aforementioned first outer pre-spinning stator, and the aforementioned second outer pre-spinning stator can all be formed with the same chord length, and the front-to-back distance of the aforementioned inner pre-spinning stator, the aforementioned first outer pre-spinning stator, and the aforementioned second outer pre-spinning stator can be more than 0.05 times and less than 0.15 times the chord length of the root of the aforementioned inner pre-spinning stator.

[0028] In embodiments to which the present invention is applied, by using a pre-spinning stator for generating a swirling flow in the opposite direction to the propeller's rotation as a support for the duct, the propeller's thrust and propulsion efficiency can be increased compared to the existing method of supporting the duct using a general support structure. Attached Figure Description

[0029] Figure 1 This is a perspective view of the propulsion efficiency improvement device according to one embodiment of the present invention, viewed from the left rear.

[0030] Figure 2 Is Figure 1 Remove the oblique view of the propeller.

[0031] Figure 3 This is a schematic diagram of a propulsion efficiency improvement device according to one embodiment of the present invention, viewed from the rear.

[0032] Figure 4 This is a schematic diagram of a propulsion efficiency improvement device according to one embodiment of the present invention, viewed from the left side.

[0033] Figure 5 This is a perspective view of the propulsion efficiency improvement device according to one embodiment of the present invention, viewed from the left rear, and is a schematic diagram of the additional cross-sectional shape in the guide tube and the pre-spinning stator.

[0034] Figure 6 This is a schematic diagram showing a portion of an embodiment of the present invention as viewed from the left, illustrating a state where the catheter is omitted.

[0035] Figure 7 This is a schematic diagram illustrating the outer side of the assembly of the catheter, the first outer pre-rotating stator, and the second outer pre-rotating stator according to one embodiment of the present invention.

[0036] Figure 8 This is a perspective view of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left rear.

[0037] Figure 9 Is Figure 8 Remove the oblique view of the propeller.

[0038] Figure 10 This is a schematic diagram of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the rear.

[0039] Figure 11 This is a schematic diagram of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left side.

[0040] Figure 12 This is a perspective view of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left rear, and is a schematic diagram of the additional cross-sectional shape added to the guide tube and the pre-spinning stator.

[0041] Figure 13This is a schematic diagram illustrating the unfolded view of the outer side of the assembly of the catheter, the first outer pre-rotating stator, and the second outer pre-rotating stator according to another embodiment of the present invention.

[0042] Figure 14 This is a schematic diagram of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left side.

[0043] Figure 15 Is Figure 14 The diagram omits the catheter.

[0044] Figure 16 This is a perspective view of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left rear.

[0045] Figure 17 This is a perspective view of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left rear. Figure 18 Is Figure 17 Remove the oblique view of the propeller.

[0046] Figures 19 to 24 This is a schematic diagram illustrating the effects of a propulsion efficiency improvement device applicable to several embodiments of the present invention.

[0047] [Symbol Explanation]

[0048] 10:Hull

[0049] 20: Stern boss

[0050] 30: Propeller

[0051] 100: Propulsion efficiency enhancement device

[0052] 110: Catheter

[0053] 131: First outer pre-spin stator

[0054] 132: Second outer pre-spin stator

[0055] 133, 134: Inner pre-spin stator

[0056] 150: First connecting part

[0057] 160: Second connecting part Detailed Implementation

[0058] This invention can be modified in various ways and has multiple embodiments. Specific embodiments will be illustrated in the accompanying drawings and described in detail below. However, this is not intended to limit the invention to specific implementations, but rather to encompass all modifications, equivalents, and substitutions within the scope of the invention's concept and technology. In the process of describing this invention, detailed descriptions of relevant prior art will be omitted when it is determined that such detailed descriptions may obscure the essence of the invention.

[0059] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the process of describing the invention with reference to the accompanying drawings, the same or corresponding constituent elements will be assigned the same drawing numbers and repeated descriptions related to them will be omitted.

[0060] Figure 1 This is a perspective view of the propulsion efficiency improvement device according to one embodiment of the present invention, viewed from the left rear. Figure 2 Is Figure 1 Remove the oblique view of the propeller from the image. Figure 3 This is a schematic diagram of a propulsion efficiency improvement device according to one embodiment of the present invention, viewed from the rear. Figure 4 This is a schematic diagram of a propulsion efficiency improvement device according to one embodiment of the present invention, viewed from the left side. For reference, in Figures 1 to 4 In the diagram, +X represents the front, while +Y represents the left.

[0061] See Figures 1 to 4 The propulsion efficiency improvement device 100 according to one embodiment of the present invention includes: a guide tube 110; and pre-spin stators 131, 132, 133, and 134.

[0062] The duct 110 is positioned in front of the propeller 30. The propeller 30 is positioned behind the stern boss 20. The propeller 30 generates thrust through rotation. In this embodiment, the propeller 30... Figures 1 to 3 When observed, it rotates clockwise. That is, the propeller 30 rotates clockwise when viewed from the rear.

[0063] The catheter 110 is formed in an arc shape.

[0064] As an example, catheter 110, such as Figures 1 to 3 As shown, the centerline A of the arc formed relative to the conduit 110 can be... D An arc shape is formed by extending from the lower left area to the upper right area.

[0065] As another example, although not illustrated, the catheter can also be formed in an arc shape that extends from the upper left region to the upper right region relative to the center line of the arc formed by the catheter.

[0066] The arc angle formed by the conduit 110 should preferably be less than 180 degrees.

[0067] The conduit 110 is formed to surround a portion of the stern boss 20.

[0068] The centerline A of the arc formed by the conduit 110 D like Figure 4 As shown, the rotating shaft A of the propeller 30 can be located P The position above.

[0069] At this time, the center line A of the arc formed by the conduit 110 D With the rotating shaft A of propeller 30 P The distance H between them can be more than 0.4 times the radius of the propeller 30 and less than 0.4 times the radius of the propeller 30. When the centerline A of the arc formed by the duct 110... D With the rotating shaft A of propeller 30 P When the distance H between them exceeds 0.4 times that of the propeller 30, it may cause a significant limitation on the range available for installing the pre-spin stator.

[0070] Furthermore, the centerline A of the arc formed by the conduit 110 D With the rotating shaft A of propeller 30 P The distance H between them can be more than 0.1 times and less than 0.4 times the radius of the propeller 30.

[0071] The duct 110 is located within the rotating region of the propeller 30. At this time, the flow through the duct 110 can flow into the propeller 30 in an orderly manner, thereby improving the propulsion efficiency of the propeller 30.

[0072] At this point, the radius of the conduit 110 is less than or equal to the radius of the propeller minus the center line A of the arc of the conduit 110. D With the rotating shaft A of propeller 30 P The value of the distance between them.

[0073] The duct 110 is capable of generating thrust. For example, the duct 110 is formed with an airfoil cross-section while simultaneously forming a convex beam arch towards the stern boss 20. This will be explained later.

[0074] As the flow moves rearward along the hull 10 through the duct 110, lift will be generated in the cross section of the duct 110. The component of the lift aligned with the length direction of the hull 10 (e.g., the X-axis direction) will act as thrust to propel the hull 10.

[0075] The conduit 110 can be supported to the stern of the hull 10 by a separate support member (not shown).

[0076] The pre-spin stators 131, 132, 133, and 134 support the guide tube 110 to the stern boss 20.

[0077] Multiple pre-spin stators 131, 132, 133, and 134 are formed.

[0078] As an example, the number of pre-spin stators 131, 132, 133, and 134 can be as follows: Figures 1 to 3 The four shown.

[0079] As another example, although not illustrated, the number of pre-spin stators can be three or five, etc.

[0080] Multiple pre-spin stators 131, 132, 133, 134, etc. Figures 1 to 3 As shown, they can be arranged at intervals along the rotation direction of the propeller 30. In other words, multiple pre-spinning stators 131, 132, 133, and 134 are arranged as follows: Figure 2 as well as Figure 3 As shown, the centerline A of the arc formed by the conduit 110 can be used as a reference. D They are arranged in a way that is centered on each other along the arc direction and spaced a certain distance apart.

[0081] As an example, multiple pre-spin stators 131, 132, 133, and 134, such as... Figure 2 as well as Figure 3 As shown, the centerline A of the arc formed relative to the conduit 110 can be... D The configuration is done by spacing the western area on the left towards the upper right area at regular intervals.

[0082] As another example, although not illustrated, multiple pre-spin stators can also be configured with a certain distance between each other from the upper left region to the upper right region relative to the center line of the arc formed by the guide tube.

[0083] Multiple pre-spin stators 131, 132, 133, and 134 are used to generate a swirling flow in the opposite direction to the rotation of the propeller 30.

[0084] The swirling flow generated by the pre-spinning stators 131, 132, 133, and 134 flows into the propeller 30, and improves propulsion efficiency by reducing the swirling flow in the direction of propeller 30's rotation. In other words, when the pre-spinning stators 131, 132, 133, and 134 generate a swirling flow in the opposite direction of propeller 30's rotation, the increased angle of attack of the flow flowing into propeller 30 leads to an increase in the thrust generated on propeller 30, thereby improving propulsion efficiency.

[0085] Figure 5This is a perspective view of the propulsion efficiency improvement device according to one embodiment of the present invention, viewed from the left rear, and is a schematic diagram of the additional cross-sectional shape in the guide tube and the pre-spinning stator.

[0086] See Figure 5 In this embodiment, the propeller rotates clockwise when viewed from the rear. At this time, multiple pre-spin stators 131, 132, 133, and 134 generate a swirling flow in the opposite direction to the rotation of the propeller (not shown), such as... Figure 5 As shown, a beam arch with a convex shape forms in the direction of rotation of the propeller (not shown).

[0087] The propulsion efficiency enhancement device 100, as described above, which is applicable to one embodiment of the present invention, serves as a support body that supports the conduit 110 for generating thrust to the stern boss portion 20, and uses pre-spin stators 131, 132, 133, and 134 that can generate a swirling flow in the opposite direction to the rotation direction of the propeller 30.

[0088] Relatedly, in order to support the duct positioned in front of the propeller and used to generate thrust, a support member with a simpler shape than that used in the pre-spin stators 131, 132, 133, and 134 of this embodiment is typically used. The simpler-shaped support member described above creates drag, thus increasing the ship's resistance.

[0089] However, the propulsion efficiency enhancement device 100 according to one embodiment of the present invention, used as a support for supporting the duct 110, can generate a swirling flow in the opposite direction to the rotation direction of the propeller 30 by pre-spinning stators 131, 132, 133, 134, thereby increasing the thrust of the propeller 30 and thereby improving the propulsion efficiency.

[0090] In this embodiment, the number of pre-spinning stators 132, 133, and 134 located on the port side of the hull 10 is greater than the number of pre-spinning stators 131 located on the starboard side.

[0091] Specifically, when observing the wake distribution flowing into the propeller in a bare hull without a pre-rotating stator, it can usually be found that a wake is generated on the port side in the same direction as the propeller's rotation, while a wake is generated on the starboard side in the opposite direction to the propeller's rotation.

[0092] On the port side, where a wake is generated in the same direction as the rotation of propeller 30, pre-spin stators 132, 133, and 134 only require a small pitch angle (attachment angle) to convert the flow flowing into them into the opposite direction to the rotation of propeller 30. However, on the starboard side, where a wake is generated in the opposite direction to the rotation of propeller 30, pre-spin stator 131 must be installed at a pitch angle (attachment angle) greater than that on the port side to convert the flow flowing into it into the opposite direction to the rotation of propeller 30.

[0093] Therefore, on the port side, where a swirling flow opposite to the propeller 30's rotation direction can be generated with only a small pitch angle, the increase in drag due to the attachment of the pre-spinning stators 132, 133, and 134 is less. Conversely, on the starboard side, where a larger pitch angle is required to generate the same swirling flow, the increase in drag due to the attachment of the pre-spinning stator 131 is greater. Therefore, to achieve higher propulsion efficiency, it is preferable to have more pre-spinning stators on the port side than on the starboard side.

[0094] In this embodiment, the first end portion of the conduit 110 in the rotational direction of the propeller 30 is interconnected with the first outer pre-spinning stator 131, which is located at the last position in the rotational direction of the propeller 30 among the plurality of pre-spinning stators 131, 132, 133, and 134. The first outer pre-spinning stator 131 is as follows... Figure 3 As shown, it can be located at the center line A of the arc formed relative to the conduit 110. D The area above and to the right of.

[0095] The second end portion of the conduit 110, in the direction opposite to the rotation direction of the propeller 30, is interconnected with the second outer pre-spinning stator 132, which is located at the last position in the opposite direction to the rotation direction of the propeller 30 among the plurality of pre-spinning stators 131, 132, 133, and 134. The second outer pre-spinning stator 132 is as follows... Figure 3 As shown, it can be located at the center line A of the arc formed relative to the conduit 110. D The area on the lower left.

[0096] In this embodiment, the shape of the duct 110 is different from that of the first outer pre-rotating stator 131.

[0097] Specifically, such as Figure 5 As shown, the guide tube 110 forms a convex beam arch in the direction of the stern boss 20, and the first outer pre-rotating stator 131 forms a convex beam arch in the direction of rotation of the propeller 30.

[0098] In other words, the conduit 110 forms a convex beam arch inside the space formed by the conduit 110, the first outer pre-rotating stator 131, and the second outer pre-rotating stator 132, while the first outer pre-rotating stator 131 forms a convex beam arch outside the space formed by the conduit 110, the first outer pre-rotating stator 131, and the second outer pre-rotating stator 132.

[0099] In this embodiment, the first end portion of the conduit 110 with different beam arch shapes as described above is continuously connected to the first outer pre-rotated stator 131.

[0100] For example, such as Figure 5 As shown, the first end portion of the guide tube 110, which protrudes in opposite directions to form a beam arch, and the first outer pre-rotating stator 131 are formed in a shape in which the beam arch gradually disappears towards its boundary.

[0101] In this embodiment, the conduit 110 has the same arch shape as the second outer pre-rotated stator 132.

[0102] Specifically, such as Figure 5 As shown, the guide tube 110 forms a convex beam arch in the direction of the stern boss 20, and the second outer pre-rotating stator 132 forms a convex beam arch in the direction of rotation of the propeller 30.

[0103] In other words, the conduit 110 and the second outer pre-rotating stator 132 both form a convex beam arch within the space formed by the conduit 110, the first outer pre-rotating stator 131, and the second outer pre-rotating stator 132.

[0104] In this embodiment, the second end portion of the conduit 110, which has the same beam arch shape as described above, is continuously connected to the second outer pre-rotated stator 132.

[0105] Figure 6 This is a schematic diagram showing a portion of an embodiment of the present invention as viewed from the left, illustrating a state where the catheter is omitted.

[0106] See Figure 5 as well as Figure 6 The first outer prespin stator 131, the second outer prespin stator 132, and the inner prespin stators 133 and 134 can be formed in the shape of a retreating wing. (See also...) Figure 5 as well as Figure 6 The first outer prespin stator 131, the second outer prespin stator 132, and the inner prespin stators 133 and 134 can be formed in the shape of a swept wing.

[0107] In other words, the trailing edges of the multiple pre-spin stators 131, 132, 133, and 134 can be located at the center line A of the arc formed with the guide tube 110. DOn the same vertical plane. At this time, multiple pre-spin stators 131, 132, 133, and 134 are as close as possible to the propeller (not shown), so that the swirling flow generated in the pre-spin stators 131, 132, 133, and 134 in the opposite direction to the rotation direction of the propeller 30 can flow directly into the propeller 30, thereby improving the propulsion efficiency.

[0108] In this embodiment, the roots of the first outer pre-spinning stator 131, the second outer pre-spinning stator 132, and the inner pre-spinning stators 133 and 134 can all be formed with the same chord length. Furthermore, the tips of the first outer pre-spinning stator 131, the second outer pre-spinning stator 132, and the inner pre-spinning stators 133 and 134 can all be formed with the same chord length. Additionally, the chord length of the roots of the first outer pre-spinning stator 131, the second outer pre-spinning stator 132, and the inner pre-spinning stators 133 and 134 can all be greater than the chord length of the tips.

[0109] See Figure 5 In this embodiment, the tips of the inner pre-rotated stators 133 and 134 can be fixed to the inner side of the conduit 110.

[0110] At this time, the front end of the tip of the inner pre-rotated stator 133, 134 is located behind the front edge of the conduit 110, and the rear end of the tip of the inner pre-rotated stator 133, 134 is located in front of the rear edge of the conduit 110.

[0111] This avoids interference between the circular cylinders forming the leading edges of the inner pre-rotating stators 133 and 134 and the circular cylinders forming the leading edge of the conduit 110, and also avoids interference between the circular cylinders forming the trailing edges of the inner pre-rotating stators 133 and 134 and the circular cylinders forming the trailing edge of the conduit 110, thereby improving operability. For reference, the operability of attaching the end of one cylinder to the side of another cylinder is lower than the operability of attaching the end of one cylinder to the side of a flat plate.

[0112] Figure 7 This is a schematic diagram illustrating the outer side of the assembly of the catheter, the first outer pre-rotating stator, and the second outer pre-rotating stator according to one embodiment of the present invention.

[0113] See Figure 7 In the unfolded diagram, the trailing edge 110b of the conduit 110 can be formed in a straight line shape, while the leading edge 110a of the conduit 110 can be formed in a forward-convex curved shape.

[0114] This allows the most prominent peak portion of the unfolded diagram of the conduit 110 to be brought close to the hull 10, thereby facilitating the fixation of the conduit 110 to the hull 10.

[0115] Specifically, in the unfolded diagram as follows Figure 7 In the catheter 110 shown, the highest peak will be as follows: Figure 4 The forward-protruding structure shown is formed. At this time, because the highest peak is close to the hull 10, the conduit 110 can also be supported in the hull 10 using a shorter support member (not shown). Because the shorter support member has greater structural strength than the longer support member, the conduit 110 can be stably supported in the hull 10.

[0116] See Figure 7 In the unfolded diagram, the curve formed by the leading edge 110a of the conduit 110 can be formed with a single curvature R. In this way, the conduit 110 is formed with a shape in which the chord length increases and then decreases from the first end portion 110c to the second end portion 110d.

[0117] Typically, the catheter employs a structure in which plates forming the pressure surface and the suction surface are integrated into a cylindrical column forming the leading edge.

[0118] In order to manufacture a conduit 110 with a single curvature R formed by the curve of its leading edge 110a on the unfolded drawing, the cylindrical column will be bent with the same curvature. This significantly improves the workability of the cylindrical column compared to bending it with two or more curvatures.

[0119] See Figure 7 The first outer pre-spin stator 131 is formed with a chord length that gradually decreases from the root 131c to the tip 131d. The second outer pre-spin stator 132 is formed with a chord length that gradually decreases from the root 132c to the tip 132d.

[0120] Figure 8 This is a perspective view of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left rear. Figure 9 Is Figure 8 Remove the oblique view of the propeller from the image. Figure 10 This is a schematic diagram of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the rear. Figure 11 This is a schematic diagram of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left. Figure 12 This is a perspective view of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left rear, and is a schematic diagram of the added cross-sectional shape in the guide tube and the pre-spinning stator. For reference, in Figures 8 to 12 In the diagram, +X represents the front, while +Y represents the left.

[0121] See Figures 8 to 12A propulsion efficiency enhancement device 100' according to another embodiment of the present invention may include: a guide tube 110; pre-spin stators 131, 132, 133, and 134; a first connecting portion 150; and a second connecting portion 160. The propulsion efficiency enhancement device 100' according to another embodiment of the present invention differs from the propulsion efficiency enhancement device 100 according to one embodiment of the present invention described above in that it further includes the first connecting portion 150 and the second connecting portion 160.

[0122] The first connecting part 150 is connected to the first outer pre-spinning stator 131, which is located at the last position in the rotation direction of the propeller 30, among the plurality of pre-spinning stators 131, 132, 133, and 134.

[0123] The first connecting portion 150 is manufactured independently of the conduit 110 and the first outer pre-rotating stator 131, and the two ends of the first connecting portion 150 can be respectively connected to the first outer pre-rotating stator 131 and the first end portion of the conduit 110.

[0124] The second connecting part 160 connects the second end of the guide tube 110 in the direction opposite to the rotation direction of the propeller 30 to the second outer pre-spin stator 132 of the plurality of pre-spin stators 131, 132, 133, 134 located at the last position in the direction opposite to the rotation direction of the propeller 30.

[0125] The second connecting part 160 is manufactured independently of the conduit 110 and the second outer pre-rotating stator 132, and the two ends of the second connecting part 160 can be respectively connected to the second outer pre-rotating stator 132 and the second end of the conduit 110.

[0126] In this embodiment, the shape of the duct 110 is different from that of the first outer pre-rotating stator 131.

[0127] Specifically, such as Figure 5 As shown, the guide tube 110 forms a convex beam arch in the direction of the stern boss 20, and the first outer pre-rotating stator 131 forms a convex beam arch in the direction of rotation of the propeller 30.

[0128] In other words, the conduit 110 forms a convex beam arch inside the space formed by the conduit 110, the first outer pre-rotating stator 131, and the second outer pre-rotating stator 132, while the first outer pre-rotating stator 131 forms a convex beam arch outside the space formed by the conduit 110, the first outer pre-rotating stator 131, and the second outer pre-rotating stator 132.

[0129] The first connecting portion 150 used in this embodiment is formed in a shape that continuously connects the first end portion of the guide tube 110, which has a different beam arch shape as described above, to the first outer pre-rotated stator 131.

[0130] For example, the first connecting part 150 Figure 5 As shown, it includes: a first region 151, with a convex beam arch formed in the same direction as the beam arch of the guide tube 110; and a second region 152, with a convex beam arch formed in the same direction as the beam arch of the first outer pre-rotated stator 131. The beam arches of the first region 151 and the second region 152 gradually disappear towards the boundaries of the first region 151 and the second region 152, respectively.

[0131] In this embodiment, the conduit 110 has the same arch shape as the second outer pre-rotated stator 132.

[0132] Specifically, such as Figure 5 As shown, the guide tube 110 forms a convex beam arch in the direction of the stern boss 20, and the second outer pre-rotating stator 132 forms a convex beam arch in the direction of rotation of the propeller 30.

[0133] In other words, the conduit 110 and the second outer pre-rotating stator 132 both form a convex beam arch within the space formed by the conduit 110, the first outer pre-rotating stator 131, and the second outer pre-rotating stator 132.

[0134] The second connecting portion 160 used in this embodiment is formed in a shape that continuously connects the second end portion of the conduit 110, which has the same beam arch shape as described above, to the second outer pre-rotated stator 132.

[0135] For example, the second connecting part 160 Figure 5 As shown, a convex beam arch is formed inside the space formed by the conduit 110, the first outer pre-rotating stator 131, and the second outer pre-rotating stator 160.

[0136] Figure 13 This is a schematic diagram illustrating the unfolded view of the outer side of the assembly of the catheter, the first outer pre-rotating stator, and the second outer pre-rotating stator according to another embodiment of the present invention.

[0137] See Figure 13 In the unfolded diagram, the trailing edge 110b of the conduit 110 can be formed in a straight line shape, while the leading edge 110a of the conduit 110 can be formed in a forward-convex curved shape.

[0138] This allows the most prominent peak portion of the unfolded diagram of the conduit 110 to be brought close to the hull 10, thereby facilitating the fixation of the conduit 110 to the hull 10.

[0139] See Figure 13 In the unfolded diagram, the curve formed by the leading edge 110a of the conduit 110 can be formed with a single curvature. In this way, the conduit 110 is formed with a shape in which the chord length increases and then decreases from the first end portion 110c to the second end portion 110d.

[0140] See Figure 13 The first outer pre-spin stator 131 is formed with a chord length that gradually decreases from the root 131c to the tip 131d. The second outer pre-spin stator 132 is formed with a chord length that gradually decreases from the root 132c to the tip 132d.

[0141] Furthermore, the first connecting portion 150 is formed with a chord length that decreases and then increases from the tip 131d of the first outer pre-rotated stator 131 to the first end portion 110c of the guide tube 110. In particular, the portion of the first connecting portion 150 where the chord length decreases and then increases becomes the shortest chord portion 153 of the first connecting portion 150. The shortest chord portion 153 of the first connecting portion 150 corresponds to the first region ( Figure 10 151 in the middle) and the first region ( Figure 10 The boundary of 152). The second connecting part 160 can be formed in a shape that decreases and then increases in chord length from the tip 132d of the second outer pre-rotated stator 132 to the second end part 110d of the guide tube 110.

[0142] In the attached figures, numbers 131a, 150a, 110a, 160a, and 132a represent the leading edge, while numbers 131b, 150b, 110b, 160b, and 132b represent the trailing edge.

[0143] Figure 14 This is a schematic diagram of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left side. Figure 15 Is Figure 14 The diagram omits the catheter. Figure 16 This is a perspective view of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left rear.

[0144] See Figures 14 to 16 The propulsion efficiency improvement device 100, which is applicable to another embodiment of the present invention, includes: a guide tube 110; a plurality of pre-spin stators 131, 132, 133, and 134; a first connecting portion 150; and a second connecting portion 160.

[0145] The propulsion efficiency improvement device 100” according to another embodiment of the present invention differs from the propulsion efficiency improvement device 100' according to one embodiment of the present invention in that the front-back positions of the plurality of pre-spin stators 131, 132, 133, and 134 are different.

[0146] In this embodiment, the inner pre-spin stators 133 and 134 are located in front of the first outer pre-spin stator 131 and the second outer pre-spin stator 132.

[0147] At this time, the front end of the tip of the inner pre-rotated stator 133, 134 is located behind the front edge of the conduit 110, and the rear end of the tip of the inner pre-rotated stator 133, 134 is located in front of the rear edge of the conduit 110.

[0148] In this embodiment, the front-to-back distance L between the inner pre-spinning stators 133 and 134, the first outer pre-spinning stator 131, and the second outer pre-spinning stator 132 can be more than 0.05 times and less than 0.15 times the chord length at the root of the inner pre-spinning stators 133 and 134, the first outer pre-spinning stator 131, or the second outer pre-spinning stator 132. For reference, in this embodiment, the chord length at the root of the inner pre-spinning stators 133 and 134, the first outer pre-spinning stator 131, and the second outer pre-spinning stator 132 are all the same.

[0149] As described above, when the inner pre-spin stators 133 and 134 are located in front of the first outer pre-spin stator 131 and the second outer pre-spin stator 132, the resistance acting on the hull 10 can be reduced compared to the case where the pre-spin stators 131, 132, 133, and 134 are all located in the same position in the length direction of the hull 10.

[0150] This is because by positioning the inner pre-rotating stators 133 and 134 at a distance L forward from the first outer pre-rotating stator 131 and the second outer pre-rotating stator 132, the Venturi effect occurring between the inner pre-rotating stators 133 and 134 and the first outer pre-rotating stator 131 and the second outer pre-rotating stator 132 can be reduced, thereby reducing the drag acting on the hull 10.

[0151] When the front-to-back distance between the inner pre-spinning stators 133 and 134 and the first outer pre-spinning stator 131 and the second outer pre-spinning stator 132 exceeds the above range, the increased distance between the inner pre-spinning stators 133 and 134 and the propeller (not shown) may cause the flow induced by the inner pre-spinning stators 133 and 134 to not flow sufficiently into the propeller (not shown), ultimately leading to a decrease in propulsion efficiency.

[0152] When the fore-and-aft distance between the inner pre-rotating stators 133 and 134 and the first outer pre-rotating stators 131 and 132 is less than the above range, the resistance acting on the hull 10 may increase due to the Venturi effect that occurs between the inner pre-rotating stators 133 and 134 and the first outer pre-rotating stators 131 and 132.

[0153] Figure 17 This is a perspective view of a propulsion efficiency improvement device according to another embodiment of the present invention, viewed from the left rear. Figure 18 Is Figure 17 Remove the oblique view of the propeller.

[0154] See Figure 17 as well as Figure 18 The propulsion efficiency improvement device 100a, which is applicable to another embodiment of the present invention, includes: a guide tube 110; and a plurality of pre-spin stators 131, 132, 133, and 134.

[0155] The unfolded diagram of catheter 110 is shown in the figure below. Figure 7 As explained, the trailing edge 110b of the catheter 110 can be formed in a straight line shape, while the leading edge 110a of the catheter 110 can be formed in a forward-convex curved shape. The highest point of the catheter 110 will be as follows: Figure 4 The structure protruding forward as shown is formed. At this point, because the highest point is close to the hull 10, the conduit 110 can be supported into the hull 10 using a shorter support member (not shown). Because the shorter support member has greater structural strength than the longer support member, the conduit 110 can be stably supported into the hull 10. Furthermore, with the connection... Figures 8 to 16 The descriptions differ, and the separate connecting parts 150 and 160 may not be included.

[0156] If the inner pre-spin stators 133 and 134 are combined Figures 14 to 16 The description is located in front of the first outer pre-spinning stator 131 and the second outer pre-spinning stator 132.

[0157] The front ends of the tips of the inner pre-rotated stators 133 and 134 are located behind the front edge of the conduit 110, and the rear ends of the tips of the inner pre-rotated stators 133 and 134 are located in front of the rear edge of the conduit 110.

[0158] As described above, when the inner pre-spin stators 133 and 134 are located in front of the first outer pre-spin stator 131 and the second outer pre-spin stator 132, the resistance acting on the hull 10 can be reduced compared to the case where the pre-spin stators 131, 132, 133, and 134 are all located in the same position in the length direction of the hull 10.

[0159] Next, please refer to Figures 19 to 22 The fuel-saving effects of the propulsion efficiency improvement devices 100, 100', 100”, and 100a, which are applicable to several embodiments of the present invention, will be described in more detail.

[0160] first, Figure 19 It involves installing multiple pre-spin stators only in front of the propeller (see...) Figures 1 to 18Examples of 131, 132, 133, and 134 in the text. Figure 20 This is an example of mounting multiple pre-spinning stators and circular ducts (i.e., full ducts) in front of the propeller. The circular duct is shaped like a circle surrounding the periphery of the pre-spinning stator. Figure 21 This is an example of a propulsion efficiency enhancement device according to several embodiments of the present invention, in which multiple pre-spin stators and partial ducts are mounted in front of the propeller.

[0161] By examining an example where only a pre-spinning stator is installed ( Figure 19 Examples of installing pre-rotated stators and circular guide tubes ( Figure 20 ) and examples of installing pre-rotated stators and some conduits ( Figure 21 The fuel-saving effect was tested by comparing it with an instance that only had a propeller installed (i.e., the comparison object instance), and the results are as follows: Figure 22 As shown. Figure 22 In this context, "stator" represents a pre-rotated stator, "full duct" represents a circular duct, and "partial duct" represents a partial duct.

[0162] See Figure 22 An example with only a pre-spinned stator installed ( Figure 19 This demonstrates a 2.0% fuel saving compared to the comparison instance. Example with pre-spun stator and circular duct installed ( Figure 20 This example demonstrates a 1.0% fuel saving compared to the comparison instance. (Example with pre-spun stator and partial ductwork installed). Figure 21 It has a 3.0% fuel saving effect compared to the comparison object instance.

[0163] For an example of installing a pre-rotated stator and a circular conduit ( Figure 20 Additional tests were conducted to confirm why the fuel-saving effect of this example was lower than that of other examples, and the results were as follows: Figure 23 as well as Figure 24 As shown.

[0164] Through the Figure 23 as well as Figure 24 A comparison reveals that, Figure 23 A pressure drop occurred between the stern boss and the circular guide tube (see D1). Conversely, in Figure 24 There was no pressure drop below the hull bosses (see D2). When a pressure drop occurs, it creates negative pressure in the lower part of the hull, increasing drag. Ultimately, this leads to a decrease in fuel efficiency.

[0165] Furthermore, in instances where only a pre-spinned stator is installed ( Figure 19 When comparing, examples of installation of pre-rotated stators and partial conduits ( Figure 21 The reasons why it is more fuel-efficient are as follows.

[0166] In examples of using partial catheters ( Figure 21 In this configuration, all pre-rotated stators and portions of the catheter are connected by a multi-point support structure (i.e., multiple support). Therefore, examples using portions of the catheter ( Figure 21 ) and an example of a pre-spinning stator with only a cantilever configuration installed ( Figure 19 Compared to other materials, its structural stability is superior.

[0167] Furthermore, the pre-spinning stator used to generate the swirling flow may experience cavitation due to end-cap eddies. Therefore, in instances where only a pre-spinning stator is installed ( Figure 19 In some cases, additional features such as winglets are needed to reduce cavitation at the ends. However, in examples using partial conduits ( Figure 21 In this design, because all pre-spinning stators are partially surrounded by ducts, the generation of end vortices can be prevented at the source. Therefore, there is no need to install additional devices such as winglets.

[0168] The embodiments of the present invention have been described above. However, those skilled in the art can make various modifications and alterations to the present invention by adding, changing, deleting or supplementing constituent elements without departing from the spirit of the present invention as set forth in the claims. Such modifications and alterations should also be understood to be included within the scope of the claims of the present invention.

Claims

1. A propulsion efficiency improvement device, characterized in that, include: The duct, positioned in front of the propeller, is formed in an arc shape and is used to generate thrust; as well as, Multiple pre-spin stators support the aforementioned duct to the stern boss, used to generate a swirling flow in the opposite direction to the rotation of the aforementioned propeller.

2. The propulsion efficiency improvement device according to claim 1, characterized in that: The aforementioned conduit forms a protruding beam arch towards the aforementioned stern boss. The aforementioned pre-rotating stators form a convex beam arch in the direction of rotation of the aforementioned propeller.

3. The propulsion efficiency improvement device according to claim 2, characterized in that, Also includes: The first connecting portion interconnects the first end portion of the aforementioned conduit in the rotation direction of the aforementioned propeller and the first outer pre-spinning stator among the plurality of pre-spinning stators located at the last position in the rotation direction of the aforementioned propeller; and, The second connecting part connects the second end of the conduit in the direction opposite to the rotation direction of the propeller and the second outer pre-spinning stator in the plurality of pre-spinning stators located at the last position in the direction opposite to the rotation direction of the propeller. The first connecting portion is formed in a shape that continuously connects the first end portion of the guide tube with a beam arch shape and the first outer pre-rotated stator. The second connecting part is formed in a shape that continuously connects the second end part of the duct with the same shape as the beam arch to the second outer pre-rotated stator.

4. The propulsion efficiency improvement device according to claim 1, characterized in that: The aforementioned conduit is formed in an arc shape that extends from the lower left region to the upper right region relative to the center line of the arc formed by the aforementioned conduit. The aforementioned pre-rotating stators are arranged at intervals from the lower left region to the upper right region relative to the center line of the arc formed by the aforementioned guide tube.

5. The propulsion efficiency improvement device according to claim 1, characterized in that: The aforementioned propeller rotates clockwise when viewed from the rear. Of the aforementioned pre-spinning stators, the number of pre-spinning stators located on the port side of the hull is greater than the number of pre-spinning stators located on the starboard side.

6. The propulsion efficiency improvement device according to claim 1, characterized in that: The centerline of the arc formed by the aforementioned conduit is located above the rotation axis of the aforementioned propeller.

7. The propulsion efficiency improvement device according to claim 1, characterized in that: The aforementioned conduit is located within the rotational area of ​​the aforementioned propeller.

8. A propulsion efficiency improvement device, characterized in that, include: Multiple pre-spin stators are supported by a stern boss in front of the propeller to generate a swirling flow in the opposite direction to the rotation of the propeller. The guide tube, supported by the end portions of the aforementioned plurality of pre-rotated stators, is formed in an arc shape and used to generate thrust; and, The connecting part is used to connect the above-mentioned conduit to the above-mentioned pre-rotated stator.

9. A propulsion efficiency improvement device, characterized in that, include: The duct, positioned in front of the propeller, is formed in an arc shape and is used to generate thrust; as well as, Multiple pre-spin stators support the aforementioned duct to the stern boss, used to generate a swirling flow in the opposite direction to the rotation of the aforementioned propeller. The aforementioned conduit is formed with a shape in which the chord length gradually changes from the first end portion in the direction of rotation of the propeller to the second end portion in the direction opposite to the direction of rotation of the propeller.

10. A propulsion efficiency improvement device, characterized in that, include: The duct, positioned in front of the propeller, is formed in an arc shape and is used to generate thrust; as well as, Multiple pre-spin stators support the aforementioned duct to the stern boss, used to generate a swirling flow in the opposite direction to the rotation of the aforementioned propeller. Among them, the aforementioned multiple pre-spin stators are located at different positions along the length of the hull.

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