WO2021187418A1 - 船のプロペラの両側に配置される左舵と右舵を備えるゲートラダー - Google Patents
船のプロペラの両側に配置される左舵と右舵を備えるゲートラダー Download PDFInfo
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- WO2021187418A1 WO2021187418A1 PCT/JP2021/010375 JP2021010375W WO2021187418A1 WO 2021187418 A1 WO2021187418 A1 WO 2021187418A1 JP 2021010375 W JP2021010375 W JP 2021010375W WO 2021187418 A1 WO2021187418 A1 WO 2021187418A1
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- rudder
- propeller
- ship
- angle
- gate
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- 238000005265 energy consumption Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 26
- 230000007423 decrease Effects 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 230000001737 promoting effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
- B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
- B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
- B63H5/15—Nozzles, e.g. Kort-type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/38—Rudders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/38—Rudders
- B63H25/382—Rudders movable otherwise than for steering purposes; Changing geometry
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H2025/066—Arrangements of two or more rudders; Steering gear therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/38—Rudders
- B63H2025/387—Rudders comprising two or more rigidly interconnected mutually spaced blades pivotable about a common rudder shaft, e.g. parallel twin blades mounted on a pivotable supporting frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/50—Slowing-down means not otherwise provided for
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
Definitions
- the present invention relates to a gate ladder having a left rudder and a right rudder arranged on both sides of a propeller provided at the stern of a ship.
- a left rudder and a right rudder extending in the front-rear direction with a predetermined interval in the front-rear direction are provided on both sides of a propeller provided at the stern of the ship, and when the ship is stopped, the left rudder and the right rudder are provided.
- Kate ladder technology is known to move the rudder to the rear of the propeller.
- Patent Document 2 the technology of a duct propeller equipped with a left rudder and a right rudder formed in an arc shape along the outer peripheral portion of the propeller on both sides of the propeller is known.
- a main object of the present invention is to provide a gate ladder capable of reducing energy consumption during the voyage of a ship.
- Another object of the present invention is to provide a gate ladder capable of suppressing the occurrence of cavitation erosion generated on the inner surface of the left and right rudders.
- the purpose is to optimize the capacity of the steering gear to a size commensurate with the small rudder area.
- the present invention that solves the above problems is as follows.
- the invention according to claim 1 is in a gate ladder including a pair of rudders including a left rudder and a right rudder arranged on both sides of a stern propeller.
- the rudder is formed by a first rudder portion extending in the left-right direction and a second rudder portion extending linearly in the vertical direction, and the rudder chord length in the front-rear direction of the second rudder portion is defined as described above. It is formed to be 40 to 100% of the diameter of the propeller, and the propeller is provided between the front edge of the second rudder and 15 to 65% of the rudder chord length in the side view, and drives the rudder in the side view.
- the gate rudder is characterized in that the rudder shaft is provided at a position of 30 to 50% of the rudder chord length from the front edge of the second rudder portion.
- the invention according to claim 2 is the gate according to claim 1, wherein the rudder shaft for driving the rudder is provided at a position 35 to 45% of the rudder chord length from the leading edge of the second rudder portion in a side view. It is a rudder.
- the invention according to claim 3 is the gate ladder according to claim 1 or 2, wherein the clearance between the propeller and the second rudder portion is formed to be 4 to 10% of the diameter of the propeller in a rear view.
- a twist angle is formed in the second rudder portion, and the upper twist angle formed in the upper part of the second rudder portion is changed to the lower portion formed in the upper part of the second rudder portion.
- the gate ladder according to any one of claims 1 to 3, which is formed to be larger than the twist angle.
- the invention according to claim 5 is the gate ladder according to claim 4, wherein the upper twist angle is formed to be 3 degrees or more and the lower twist angle is formed to be 5 degrees or less.
- the invention according to claim 6 is the gate ladder according to any one of claims 1 to 5, which steers the second rudder forward when the ship is stopped.
- the large rudder force due to the coranda effect and the large rudder force due to the USB effect generated at the rear generate a large thrust that moves the ship forward, reducing energy consumption during the ship's voyage, and at the same time minimizing the rudder torque. It can also be converted.
- the rudder shaft for driving the rudder is set to 35 to 45 of the rudder chord length from the leading edge of the second rudder portion in the side view. Since it is provided at the% position, a larger rudder force can be generated when the second rudder portion is steered forward, and at the same time, the rudder torque can be further minimized.
- the clearance between the propeller and the second rudder portion is formed to be 4 to 10% of the diameter of the propeller in the rear view. It is possible to maintain a large steering force due to the USB effect generated at the rear portion of the second rudder portion and prevent the occurrence of cavitation erosion on the inner surface of the second rudder shaft.
- a twist angle is formed in the second rudder portion and formed on the upper part of the second rudder portion. Since the upper rudder angle formed is larger than the lower rudder angle formed on the upper part of the second rudder, the second rudder facing the shallow draft of the ship where the flow velocity of the suction flow flowing into the propeller is fast. Larger thrust is generated at the top of the section, which can further reduce the energy consumption during the voyage of the ship.
- the upper twist angle is formed to be 3 degrees or more and the lower twist angle is 5 degrees or less. Since it is formed in, it is possible to reduce the energy consumption during the voyage of an enlarged ship such as a tanker from a thin ship shape such as a container ship.
- a gate rudder provided with a left rudder and a right rudder on both sides of a propeller. It is a left side view of a gate ladder. It is a right side view of a gate ladder.
- Cp 0.7
- the right rudder of the gate ladder (a) is a right side view, (b) is a cross-sectional view of the upper part of the right rudder, (c) is a cross-sectional view of the lower part of the right rudder, and (d) is the twist angle of the right rudder. It is explanatory drawing of. It is a measured value of the resistance value when a model ship equipped with a normal rudder and a gate rudder is navigated at an oblique angle of 0 to 10 degrees. It is a measured value of the rudder lateral force when a model ship equipped with a normal rudder and a gate rudder is navigated at an oblique angle of 0 to 10 degrees. (A) of the disturbance of the flow field of the suction flow is a simulation of a gate ladder having no twist angle formed, and (b) is a simulation of a gate ladder having a twist angle formed.
- the rudder of the present embodiment (hereinafter referred to as a gate rudder) is formed of a left rudder 2A and a right rudder 2B arranged on both sides of a ship propeller 1.
- the left rudder 2A is formed of a first left rudder portion 5A extending in the left-right direction and a second left rudder portion 6A extending downward from the left end portion of the first left rudder portion 5A. It is also possible to connect the left end portion of the first left rudder portion 5A and the upper portion of the second left rudder portion 6A with an inclined and gently curved connecting portion (not shown).
- a left rudder shaft 10A extending in the vertical direction is fixed to the right part of the first left rudder portion 5A, the upper part of the left rudder shaft 10A extends into the engine chamber of the ship, and the upper part of the left rudder shaft 10A is above the left rudder shaft 10A.
- a left steering machine (not shown) for steering the left steering shaft 10A is connected.
- the right rudder 2B is formed of a first right rudder portion 5B extending in the left-right direction and a second right rudder portion 6B extending downward from the right end portion of the first right rudder portion 5B. .. It is also possible to connect the left end portion of the first left rudder portion 5A and the upper portion of the second left rudder portion 6A with an inclined and gently curved connecting portion (not shown).
- a right rudder shaft 10B extending in the vertical direction is fixed to the left portion of the first right rudder portion 5B, the upper part of the right rudder shaft 10B extends into the engine chamber of the ship, and the upper part of the right rudder shaft 10B is above the right rudder shaft 10B.
- a right steering machine (not shown) for steering the right steering shaft 10B is connected.
- the left rudder 2A and the right rudder 2B are collectively referred to as the rudder 2, and the first left rudder portion 5A and the first right rudder portion 5B are collectively referred to as the first rudder portion.
- the left rudder unit 6A and the second right rudder unit 6B are collectively referred to as the second rudder unit 6, and the left rudder shaft 10A and the right rudder shaft 10B are collectively referred to as the rudder shaft.
- the left rudder chord length CA of the second left rudder portion 6A is preferably formed to be 40 to 100% of the diameter D of the propeller 1 as well as the duct length of the duct propeller. As a result, the rudder force can be efficiently obtained from the second left rudder portion 6A.
- the distance between the front end portion of the second left rudder portion 6A and 15 to 65% of the left rudder chord length CA that is, the front end portion E of the blade portion of the propeller 1 is set to the front end portion of the second left rudder portion 6A.
- the rear end F of the blade portion of the propeller 1 is arranged from the front end of the second left rudder portion 6A to the front side of 65% of the left rudder string length CA. It is arranged.
- the right rudder chord length CB of the second right rudder portion 6B is preferably formed to be 40 to 100% of the diameter D of the propeller 1. As a result, the steering force can be efficiently obtained from the second right steering portion 6B.
- the distance between the front end portion of the second left rudder portion 6A and 15 to 65% of the right rudder chord length CB, that is, the front end portion E of the blade portion of the propeller 1 is set to the front end portion of the second left rudder portion 6A.
- the rear end F of the blade portion of the propeller 1 is placed on the rear side of 15% of the right rudder chord length CB, and the rear end portion F of the blade portion of the propeller 1 is located on the front side of the right rudder chord length CB from the front end portion of the second left rudder portion 6A. It is arranged.
- the left rudder string length CA and the right rudder string length CB are collectively referred to as the rudder string length C.
- the left rudder shaft 10A is preferably provided from the leading edge of the second left rudder portion 6A to 30 to 50% of the left rudder chord length CA of the second left rudder portion 6A, and the right rudder shaft 10B is the second right rudder portion. It is preferably provided at 30 to 50% of the right rudder chord length CB of the second right rudder portion 6B from the leading edge of 6B. Further, in order to generate a large steering force during forward steering, the left rudder shaft 10A is provided from the front edge of the second left rudder portion 6A to 35 to 45% of the left rudder chord length CA of the second left rudder portion 6A.
- the rudder force F N generated at the rear part of the second rudder portion 6 extending rearward from the propeller 1 is the rudder force F N1 generated at the rear portion of the second rudder portion 6 located outside the jet flow of the propeller 1.
- the rudder force F N2 generated in the rear part of the second rudder portion 6 located in the jet flow of the propeller 1 can be substituted into the equation 1 for calculation.
- the F N1 of the equation 1 can be calculated from the equation 2.
- [rho is the density
- U R1 speed at the steering position A R is the rear of the area of the second Hidarikaji portion 6A extending rearward from the propeller 1
- the C L1 is the lift coefficient.
- the UR1 of the equation 2 can be calculated from the equation 3.
- Equation 5 The F N2 of Equation 1 can be calculated from Equation 5.
- u R2 is a propeller axial component of velocity
- v R is a circumferential component of velocity
- the C L2 of Eq. 5 can be calculated from Eq. 7.
- ⁇ is the aspect ratio of the rudder and ⁇ is the rudder angle.
- the ⁇ of the equation 1 can be calculated from the equation 8.
- FIG. 7 shows the position of the center of action (dimensionless value) of the rudder force obtained from the water tank experiment in comparison with the normal rudder.
- the outer peripheral line L of the propeller 1 and the left clearance TA of the left inner surface 7A of the second left rudder portion 6A extend forward of the propeller 1 due to the suction flow flowing into the propeller 1 by the suction force of the propeller 1.
- the outer peripheral line L of the propeller 1 and the right clearance TB of the right inner surface 7B of the second right rudder portion 6B extend forward of the propeller 1 due to the suction flow flowing into the propeller 1 by the suction force of the propeller 1.
- the left clearance TA and the right clearance TB are set to less than the specified clearance, the inner surfaces of the left and right rudders may be damaged by cavitation, and the left clearance TA and the right clearance TB are set to the specified clearance.
- the flow velocity of the suction flow and the flow velocity of the jet flow may become low, the Coanda effect and the USB effect may decrease, and the steering force may decrease.
- the left inner surface 7A and the right inner surface 7B are collectively referred to as an inner surface 7, and the left clearance TA and the right clearance TB are collectively referred to as a clearance T.
- the left rudder shaft 10A is steered to a ⁇ rudder angle (forward steering angle), and the front portion of the second left rudder portion 6A is positioned on the front right side of the rear portion.
- the rudder force generated when the rudder is in the rudder position is the second left rudder 6A by steering the left rudder shaft 10A to the + rudder angle (rear steering angle) due to the flap effect due to the interference between the stern and the second left rudder 6A. It is larger than the steering force generated when the front part of the is positioned on the front left side of the rear part.
- the ⁇ rudder angle of the left rudder shaft 10A is the rudder angle obtained by steering the left rudder shaft 10A forward in the clockwise direction
- the + rudder angle of the left rudder shaft 10A is the left rudder shaft 10A.
- the rudder angle is steered backward in the counterclockwise direction
- the-rudder angle of the right rudder shaft 10B is the rudder angle in which the right rudder shaft 10B is steered forward in the counterclockwise direction
- the right rudder shaft 10B + rudder angle is This is a rudder angle in which the right rudder shaft 10B is steered backward in the clockwise direction.
- the maximum steering angle of the-rudder angle of the left rudder shaft 10A is set to 15 degrees, which is the same as the steering force generated when the rudder angle is steered to the + rudder angle by 25 degrees.
- the rotation angle of the left rudder shaft 10A can be arbitrarily set, but in the present embodiment, the rotation angle is set to 0 to 15 degrees for the ⁇ rudder angle and 0 to 105 degrees for the + rudder angle.
- the maximum steering angle of the-rudder angle of the right steering shaft 10B is set to 15 degrees, which is the same as the steering force generated when the steering angle is steered to the + steering angle by 25 degrees.
- the rotation angle of the right rudder shaft 10B can be arbitrarily set, but in the present embodiment, the rotation angle is set to 0 to 15 degrees for the ⁇ rudder angle and 0 to 105 degrees for the + rudder angle.
- the left rudder shaft 10A is steered 15 degrees to the rudder angle
- the right rudder shaft 10B is steered 15 degrees to the rudder angle, thereby promoting the idleness of the propeller. Since the water flow from the aircraft can be blocked and the inertial force of the propeller can be reduced, it is easy to shift to the reverse rotation state especially in the case of FPP (fixed pitch propeller), and the stopping performance and the reverse performance can be improved.
- FPP fixed pitch propeller
- the clearance T between the outer peripheral line L of the propeller 1 and the inner surface 7 of the second rudder portion 6 can be calculated from Equation 9.
- Rp is the turning radius of the second rudder unit 6
- Cp is a value obtained by dividing the length of the leading edge of the second rudder unit 6 and the rudder shaft 6 by the rudder chord length C in the side view (0. 3 to 0.5)
- ⁇ is the steering steering shaft at the ⁇ rudder angle of the rudder shaft 10 (set to 15 degrees in this embodiment).
- the clearance T calculated by increasing from 0.4 to 0.7 is 0.06D to 0.1D. Therefore, it is preferable that the clearance T between the outer peripheral line L of the propeller 1 and the inner surface 7 of the second rudder portion 6 is formed to be 4 to 10% of the diameter D of the propeller 1.
- the second left rudder portion 6A connects the centers of the second left rudder portion 6A in the width direction, and is a wing composed of a warp line (camber line) having a bulge on the propeller side. It is formed in a mold.
- a warp line camber line
- the suction flow generated by the propeller 1 generated on the front edge side of the inner surface 7A of the second left rudder portion 6A causes the Coanda effect, and the lift and the corresponding steering force are generated. Can be increased.
- the second right rudder portion 6B is formed by an airfoil formed by a warp line (camber line) having a bulge on the propeller side connecting the centers of the second right rudder portion 6B in the width direction. ing.
- a warp line camber line
- the suction flow generated by the propeller 1 generated on the front edge side of the inner surface 7B of the second right rudder portion 6B causes the Coanda effect, and the lift and the corresponding steering force are generated. Can be increased.
- the second left rudder portion 6A illustrated in FIG. 12 has a twist angle ⁇ A formed over the entire length of the rudder chord length of the second left rudder portion 6A, but is on the front side of the left rudder shaft 10A in side view. It is also possible to form a twist angle ⁇ A only in the front portion of the second left rudder portion 6A.
- the upper left twist angle ⁇ A1 of the upper part of the second left rudder portion 6A is formed larger than the lower left twist angle ⁇ A2 of the lower part of the second left rudder portion 6A.
- a large thrust is applied to the upper part of the second left rudder portion 6A facing the shallow draft of the ship with a high flow velocity such as the ship suction flow, which is more affected by the suction flow of the propeller than the flow velocity without the propeller operation. It can be generated efficiently.
- the twist angle ⁇ A is formed on the entire length of the rudder string length of the second left rudder portion 6A, but in the side view, it is in front of the second left rudder portion 6A on the front side of the left rudder shaft 10A. It is also possible to form a twist angle ⁇ A only in the portion.
- the front portion of the second right steering portion 12 is located on the right side of the virtual line with respect to the virtual line in the front-rear direction, and the second right The right twist angle ⁇ B is formed so that the rear portion of the rudder portion 6B is located on the left side of the virtual line.
- the suction flow flowing into the propeller 1 and the jet flow ejected from the propeller 1 can flow with respect to the rudder chord line of the second right rudder portion 6B with a predetermined angle of attack, so that the second right rudder 6B can flow.
- the resistance can be reduced and the lift can be increased.
- the thrust that propels the ship forward can be increased.
- the upper right twist angle ⁇ B1 of the upper part of the second right rudder portion 6B is formed larger than the lower right twist angle ⁇ B2 of the lower part of the second right rudder portion 6B.
- twist angle ⁇ A and the twist angle ⁇ B are collectively referred to as the twist angle ⁇
- twist angle ⁇ A1 and the twist angle ⁇ B1 are collectively referred to as the upper twist angle ⁇ 1 and are twisted.
- the clearance angle ⁇ A2 and the twist angle ⁇ B2 are collectively referred to as the lower twist angle ⁇ 2.
- the upper twist angle ⁇ 1 is formed larger than the lower twist angle ⁇ 2, and the upper twist angle ⁇ 1 is formed to be 3 degrees or more and the lower twist angle ⁇ 1 is formed.
- the clearance angle ⁇ 2 is preferably formed at 5 degrees or less.
- the rudder resistance of the gate ladder of the present embodiment is smaller than that of the normal rudder. It was also found that when the oblique angle of the ship is 0 to 9 degrees, the rudder resistance of the gate ladder acts as a thrust to propel the ship forward. From this, it was clarified that when the gate ladder of the present embodiment is used, there is an effect of significantly reducing the energy consumption during the voyage of the ship.
- the gate ladder of the present embodiment is referred to as the rudder of the present invention, and the normal rudder is referred to as the normal rudder.
- the rudder lateral force of the gate ladder of the present embodiment that is, the restoring force for returning the ship to the straight-ahead state is higher than that of the normal rudder. It turned out to be big. From this, it was clarified that when the gate ladder of the present embodiment is used, there is an effect of significantly improving the needle holding property of the ship.
- the gate ladder of the present embodiment is referred to as the rudder of the present invention
- the normal rudder is referred to as the normal rudder.
- the gate ladder having the twist angle ⁇ formed in the second left rudder portion 6 attracts the suction flowing into the propeller 1 as compared with the gate ladder not forming the twist angle in the second left rudder portion 6. It was found to suppress the disturbance of the flow field. As a result, it was clarified that there is an effect of preventing a decrease in the flow velocity due to the turbulence of the suction flow, preventing a decrease in the thrust generated in the gate ladder, and maintaining a large thrust.
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Abstract
Description
請求項1に係る発明は、船尾のプロペラの両側に配置される左舵と右舵からなる一対の舵を備えるゲートラダーにおいて、
背面視において、前記舵を左右方向に延在する第1舵部と上下方向に直線状に延在する第2舵部で形成し、前記第2舵部の前後方向の舵弦長さを前記プロペラの直径の40~100%に形成し、側面視において、前記プロペラを第2舵部の前縁から舵弦長さの15~65%の間に設け、側面視において、前記舵を駆動する舵軸を、前記第2舵部の前縁から舵弦長さの30~50%の位置に設けたことを特徴とするゲートラダーである。
図2に示すように、第2左舵部6Aの左舵弦長CAは、ダクトプロペラのダクト長さと同様にプロペラ1の直径Dの40~100%に形成するのが好ましい。これにより、第2左舵部6Aから効率良く舵力を得ることができる。
左舵軸10Aは、第2左舵部6Aの前縁から第2左舵部6Aの左舵弦長CAの30~50%に設けるのが好ましく、右舵軸10Bは、第2右舵部6Bの前縁から第2右舵部6Bの右舵弦長CBの30~50%に設けるのが好ましい。また、前方操舵時に大きな舵力を発生させるためには、左舵軸10Aは、第2左舵部6Aの前縁から第2左舵部6Aの左舵弦長CAの35~45%に設けるのが好ましく、右舵軸10Bは、第2右舵部6Bの前縁から第2右舵部6Bの右舵弦長CBの35~45%に設けるのがより好ましい。これにより、左舵軸10Aと右舵軸10Bを操舵させるトルクを小さくすることができ、また、後述するように、船を停止する場合には、船の直進時にプロペラ1よりも後方に延在する第2左舵部6Aと第2右舵部6Bの後部の舵力の減少を抑制することもできる。
図8に示すように、プロペラ1の外周線Lと第2左舵部6Aの左内面7Aの左クリアランスTAは、プロペラ1の吸引力によってプロペラ1に流れ込む吸引流によってプロペラ1よりも前方に延在する第2左舵部6Aの前部に発生するコアンダ効果による舵力と、プロペラ1から噴出される噴流によってプロペラ1よりも後方に延在する第2左舵部6Aの後部に発生するUSB効果による舵力に大きな影響を与える。
図14に示すように、第2左舵部6Aには、前後方向の仮想線に対して、第2左舵部6Aの前部が仮想線よりも左側に位置し、第2左舵部6Aの後部が仮想線よりも右側に位置するように左捻じり角αAが形成されている。これにより、第2左舵部6Aの舵弦線に対してプロペラ1に流れ込む吸引流とプロペラ1から噴出される噴流を所定の迎え角を持って流すことができるので、第2左舵6Aはその抵抗を小さくして、その揚力を大きくすることができる。船を前方に推進する推力を大きくすることができる。なお、図12に図示した第2左舵部6Aは、第2左舵部6Aの舵弦長さの全長に捻じり角αAを形成しているが、側面視において左舵軸10Aよりも前側の第2左舵部6Aの前部のみに捻じり角αAを形成することもできる。
2 舵
2A 左舵
2B 右舵
5 第1舵部
6 第2舵部
10 舵軸
T クリアランス
α 捻じり角
α1 上部捻じり角
α2 下部捻じり角
Claims (6)
- 船尾のプロペラの両側に配置される左舵と右舵からなる一対の舵を備えるゲートラダーにおいて、
背面視において、前記舵を左右方向に延在する第1舵部と上下方向に直線状に延在する第2舵部で形成し、
前記第2舵部の前後方向の舵弦長さを前記プロペラの直径の40~100%に形成し、
側面視において、前記プロペラを第2舵部の前縁から舵弦長さの15~65%の間に設け、
側面視において、前記舵を駆動する舵軸を、前記第2舵部の前縁から舵弦長さの30~50%の位置に設けたことを特徴とするゲートラダー。 - 側面視において、前記舵を駆動する舵軸を、前記第2舵部の前縁から舵弦長さの35~45%の位置に設けた請求項1記載のゲートラダー。
- 背面視において、前記プロペラと第2舵部のクリアランスを、前記プロペラの直径の4~10%に形成した請求項1又は2記載のゲートラダー。
- 前記第2舵部に捻じり角を形成し、前記第2舵部の上部に形成された上部捻じり角を、前記第2舵部の上部に形成された下部捻じり角よりも大きく形成した請求項1~3のいずれか1項に記載のゲートラダー。
- 前記上部捻じり角度を3度以上に形成し、前記下部捻じり角度を5度以下に形成した請求項4記載のゲートラダー。
- 船の停止時には、前記第2舵部を前方操舵する請求項1~5のいずれか1項に記載のゲートラダー。
Priority Applications (5)
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CA3169008A CA3169008A1 (en) | 2020-03-19 | 2021-03-15 | Gate rudder provided with port rudder and starboard rudder disposed on either side of propeller of ship |
US17/912,467 US20230166825A1 (en) | 2020-03-19 | 2021-03-15 | Gate rudder including left rudder and right rudder disposed left and right of propeller of ship |
CN202180021757.7A CN115298089A (zh) | 2020-03-19 | 2021-03-15 | 具有配置在船的螺旋桨的两侧的左舵和右舵的门舵 |
EP21770860.1A EP4122813A4 (en) | 2020-03-19 | 2021-03-15 | DOOR RUDDER WITH A PORT RUDDER AND A STARBOARD RUDDER ARRANGED ON EITHER SIDE OF A SHIP PROPELLER |
KR1020227031988A KR20220139394A (ko) | 2020-03-19 | 2021-03-15 | 선박의 프로펠러 양측에 배치되는 좌현 타와 우현 타를 구비하는 게이트 러더 |
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EP (1) | EP4122813A4 (ja) |
JP (1) | JP7493359B2 (ja) |
KR (1) | KR20220139394A (ja) |
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WO2023044839A1 (zh) * | 2021-09-26 | 2023-03-30 | 无锡市东舟船舶设备股份有限公司 | 一种舵叶装置和船舶 |
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JPH01501384A (ja) | 1986-11-20 | 1989-05-18 | マリコ アクスゼセルスカプ | 船の操縦装置 |
JP5833278B1 (ja) | 2014-01-31 | 2015-12-16 | 株式会社ケイセブン | 操舵装置及びその操舵方法 |
JP2016016777A (ja) * | 2014-07-09 | 2016-02-01 | 株式会社ケイセブン | 操舵装置 |
JP2016188033A (ja) * | 2015-03-30 | 2016-11-04 | 株式会社ケイセブン | 操舵装置 |
JP2019034709A (ja) * | 2017-08-21 | 2019-03-07 | 株式会社ケイセブン | 操舵装置 |
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JPS5833278B2 (ja) | 1974-10-25 | 1983-07-19 | 株式会社日立製作所 | 流動床接触分解系における触媒の焼成強化方法 |
JPH0966895A (ja) * | 1995-08-31 | 1997-03-11 | Nippon Souda Syst Kk | 高揚力二枚舵装置 |
JP3751260B2 (ja) * | 2001-05-09 | 2006-03-01 | ジャパン・ハムワージ株式会社 | 大型船用二枚舵システム |
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- 2021-03-15 CN CN202180021757.7A patent/CN115298089A/zh active Pending
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JPH01501384A (ja) | 1986-11-20 | 1989-05-18 | マリコ アクスゼセルスカプ | 船の操縦装置 |
JP5833278B1 (ja) | 2014-01-31 | 2015-12-16 | 株式会社ケイセブン | 操舵装置及びその操舵方法 |
JP2016016777A (ja) * | 2014-07-09 | 2016-02-01 | 株式会社ケイセブン | 操舵装置 |
JP2016188033A (ja) * | 2015-03-30 | 2016-11-04 | 株式会社ケイセブン | 操舵装置 |
JP2019034709A (ja) * | 2017-08-21 | 2019-03-07 | 株式会社ケイセブン | 操舵装置 |
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WO2023044839A1 (zh) * | 2021-09-26 | 2023-03-30 | 无锡市东舟船舶设备股份有限公司 | 一种舵叶装置和船舶 |
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US20230166825A1 (en) | 2023-06-01 |
JP2021146924A (ja) | 2021-09-27 |
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CN115298089A (zh) | 2022-11-04 |
EP4122813A1 (en) | 2023-01-25 |
JP7493359B2 (ja) | 2024-05-31 |
EP4122813A8 (en) | 2023-03-15 |
CA3169008A1 (en) | 2021-09-23 |
KR20220139394A (ko) | 2022-10-14 |
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