Energy-saving guide wheel and ship

Abstract

The present invention discloses an energy-saving guide wheel and a ship. The energy-saving guide wheel comprises: an inner layer semi-duct, an outer layer semi-duct, a plurality of outer layer stator blades and a plurality of inner layer stator blades; the chord length of the outer layer semi-duct is smaller than the chord length of the inner layer semi-duct; the inner layer stator blades are circumferentially dispersed, and one or two inner layer stator blades are arranged on the starboard side of the stern of the hull, and the remaining inner layer stator blades are arranged on the port side of the stern of the hull; the root of the inner layer stator blade is fixedly connected to the stern of the hull, and the tip of the inner layer stator blade is fixedly connected to the inner wall of the inner layer semi-duct; the root of the outer layer stator blade is fixedly connected to the outer wall of the inner layer semi-duct, and the tip of the outer layer stator blade is fixedly connected to the inner wall of the outer layer semi-duct. The energy-saving guide wheel of the embodiment of the present invention solves the problem of low energy-saving effect for ships with smaller wake in the existing energy-saving guide wheel technology, reduces the wet surface area of ​​the outer layer semi-duct, reduces the self-resistance of the energy-saving guide wheel, and thus improves the propulsion efficiency of the ship.

Description

Technical Field

[0001] The present invention relates to the technical field of ship hydrodynamic energy saving, and in particular to an energy-saving guide wheel and a ship. Background Art

[0002] In the current shipping industry, the requirements for fuel consumption of ships are becoming increasingly stringent, and ship emissions are increasingly required to be low-carbon and environmentally friendly. More and more newly built and renovated ships are improving the propeller propulsion efficiency by installing energy-saving guide wheels at the stern of the hull and in front of the propeller.

[0003] Currently, propeller-mounted energy-saving guide wheels on the market primarily consist of multiple stator guide vanes plus a fan-shaped duct, or a combination of multiple stator guide vanes plus two fan-shaped ducts. Patent document "Guangguang-Type Front Guide Wheel" (CN103332280A) describes a Guangguang-type front guide wheel with stator blades extending outside the duct, forming a cantilever beam structure.

[0004] The existing energy-saving guide wheel is very likely to cause structural vibration, affecting the structural strength of the Guangguang type front guide wheel and the hull. Moreover, due to the large wet surface area, the resistance of the energy-saving guide wheel is increased, which reduces the propulsion efficiency of the ship. Summary of the Invention

[0005] The present invention provides an energy-saving guide wheel and a ship, which can solve the problems of low energy-saving effect and large vibration of the energy-saving guide wheel in the existing energy-saving guide wheel technology for ships with small wakes, reduce the wet surface area of ​​the outer semi-duct, reduce the self-resistance of the energy-saving guide wheel, thereby improving the propulsion efficiency of the ship, strengthening the strength of the energy-saving guide wheel, and reducing the vibration of the energy-saving guide wheel.

[0006] In the first aspect, an embodiment of the present invention provides an energy-saving guide wheel, comprising: an inner half-duct, an outer half-duct, a plurality of outer stator blades and a plurality of inner stator blades; the outer half-duct is arranged on the port side of the stern of the hull; the chord length of the outer half-duct is smaller than the chord length of the inner half-duct; the inner stator blades are circumferentially dispersed, and one or two inner stator blades are arranged on the starboard side of the stern of the hull, and the remaining inner stator blades are arranged on the port side of the stern of the hull; the root of the inner stator blade is fixedly connected to the stern of the hull, and the tip of the inner stator blade is fixedly connected to the inner wall of the inner half-duct; the outer stator blades are circumferentially dispersed on the port side of the stern of the hull, the root of the outer stator blade is fixedly connected to the outer wall of the inner half-duct, and the tip of the outer stator blade is fixedly connected to the inner wall of the outer half-duct.

[0007] Optionally, the number of inner stator blades arranged on the port side of the stern of the hull is less than the number of outer stator blades arranged on the port side of the stern of the hull, and the inner stator blades arranged on the port side of the stern of the hull and the outer stator blades arranged on the port side of the stern of the hull are arranged to have different circumferential installation angles and twist angles.

[0008] Optionally, the number of the inner stator blades arranged on the port side of the stern of the hull is the same as the number of the outer stator blades arranged on the port side of the stern of the hull, and the inner stator blades arranged on the port side of the stern of the hull and the outer stator blades arranged on the port side of the stern of the hull are arranged as one piece.

[0009] Optionally, the inner stator blades arranged on the port side of the stern portion of the hull or the outer stator blades arranged on the port side of the stern portion of the hull include a first stator blade, a second stator blade and a third stator blade.

[0010] Optionally, the angle between the first stator blade and the mid-longitudinal section of the stern of the hull is in the range of 60° to 85°; the angle between the second stator blade and the mid-longitudinal section of the stern of the hull is in the range of 30° to 60°; the angle between the third stator blade and the mid-longitudinal section of the stern of the hull is in the range of 0° to 30°.

[0011] Optionally, the inner stator blades arranged on the port side of the stern of the hull and the outer stator blades arranged on the port side of the stern of the hull are not arranged in an integrated manner; the chord length of the inner half-duct is greater than the chord length of the inner stator blades and greater than the chord length of the outer stator blades; the chord length of the outer half-duct is less than the chord length of the outer stator blades; or, the inner stator blades arranged on the port side of the stern of the hull and the outer stator blades arranged on the port side of the stern of the hull are arranged in an integrated manner; the chord length of the inner half-duct is greater than the chord length of any inner stator blade or greater than the chord length of any outer stator blade; the chord length of the outer half-duct is less than the chord length of any inner stator blade or less than the chord length of any outer stator blade.

[0012] Optionally, the arc angle corresponding to the inner half-duct is in the range of 70° to 130°, and the ratio of the radius of the inner half-duct to the propeller radius is in the range of 0.25 to 0.5.

[0013] Optionally, the ratio of the chord length of the outer half-duct to the chord length of the outer stator blade is in the range of 0.2 to 0.6; and the arc angle corresponding to the outer half-duct is in the range of 50° to 100°.

[0014] Optionally, the energy-saving guide wheel also includes an outer half-duct fixed support, and the outer half-duct is fixedly connected to the stern of the hull through the outer half-duct fixed support.

[0015] In a second aspect, an embodiment of the present invention provides a ship, comprising an energy-saving guide wheel according to any of the above embodiments.

[0016] The energy-saving guide wheel provided in an embodiment of the present invention includes an inner half-duct, an outer half-duct, multiple outer stator blades and multiple inner stator blades; by setting the root of the inner stator blade to be fixedly connected to the stern of the hull, and the tip of the inner stator blade to be fixedly connected to the inner wall of the inner half-duct; the root of the outer stator blade is fixedly connected to the outer wall of the inner half-duct, and the tip of the outer stator blade is fixedly connected to the inner wall of the outer half-duct, the strength of the stator blade can be increased, the vibration of the stator blade can be reduced, and the structural reliability of the energy-saving device can be improved; by setting the chord length of the outer half-duct to be smaller than the chord length of the inner half-duct, the wet surface area of ​​the outer half-duct can be reduced, the self-resistance of the energy-saving guide wheel can be reduced, and the propulsion efficiency of the ship can be improved.

[0017] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic structural diagram of an energy-saving guide wheel provided by an embodiment of the present invention;

[0020] Figure 2 This invention Figure 1 A front view of an energy-saving guide wheel is provided;

[0021] Figure 3 This is a structural diagram of another energy-saving guide wheel provided by an embodiment of the present invention;

[0022] Figure 4 This invention Figure 3 A front view of an energy-saving guide wheel is provided. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] As described in the background technology, in the prior art, the tip of the stator blade extends to the outside of the duct, and the root of the stator blade is fixedly connected to the stern of the hull, which provides a better energy-saving effect for the ship. However, only the root of the stator blade is connected to the stern of the hull, and the hull provides less support for the front energy-saving guide wheel. The stiffness of the entire energy-saving guide wheel is low, and its natural frequency is also reduced, which is prone to resonance. The front energy-saving guide wheel is very likely to generate large vibrations and cause vibration damage. On the other hand, the generation of resonance increases the flow separation of the stern flow field and worsens the propeller accompanying flow field, which reduces the propeller propulsion efficiency and significantly worsens the energy-saving effect.

[0026] Based on the above problems, an embodiment of the present invention provides an energy-saving guide wheel. Figure 1 This is a schematic diagram of the structure of an energy-saving guide wheel provided by an embodiment of the present invention. This embodiment is applicable to energy-saving situations in front of propellers of ships with small wakes, such as Figure 1 As shown, the energy-saving guide wheel includes: an inner half-duct 10, an outer half-duct 20, a plurality of outer stator blades 30 and a plurality of inner stator blades 40; the outer half-duct 20 is arranged on the port side of the stern of the hull; the chord length of the outer half-duct 20 is smaller than the chord length of the inner half-duct 10; the inner stator blades 40 are circumferentially dispersed, and one or two inner stator blades 40 are arranged on the starboard side of the stern 50 of the hull, and the remaining inner stator blades 40 are arranged on the starboard side of the stern 50 of the hull. 0 is arranged on the port side of the stern part 50 of the hull; the root of the inner stator blade 40 is fixedly connected to the stern part 50 of the hull, and the tip of the inner stator blade 40 is fixedly connected to the inner wall of the inner half-duct 10; the outer stator blade 30 is circumferentially dispersed and arranged on the port side of the stern part 50 of the hull, the root of the outer stator blade 30 is fixedly connected to the outer wall of the inner half-duct 10, and the tip of the outer stator blade 30 is fixedly connected to the inner wall of the outer half-duct 20.

[0027] The energy-saving guide wheel is an energy-saving device developed based on analysis of the operating characteristics and aft flow field of the stern propeller. It improves the propeller's operating environment to enhance propulsion efficiency or recovers flow energy behind the propeller, thereby reducing propeller power input and achieving energy savings. The energy-saving guide wheel can be made from a variety of materials, including carbon structural steel. The specific dimensions of the guide wheel vary depending on the ship type and should be determined and tested accordingly. Typical energy savings can reach 3% to 8%.

[0028] First, the energy-saving guide wheel accelerates the water flow around the propeller, making the axial flow velocity uniform across the entire disc, thus changing the propeller's operating conditions. This improves propulsion efficiency, reduces excitation forces, and attenuates hull vibration. Second, when the propeller is operating, the guide vanes built into the energy-saving guide wheel generate favorable pre-swirl, reducing rotational energy losses in the propeller's wake. Finally, it improves aft flow separation, generating additional positive thrust, which has a beneficial effect on reducing thrust depreciation.

[0029] Specifically, the energy-saving guide wheel is installed at the stern of the hull, ahead of the propeller. The half-duct can even out the wake field and increase propeller flow, allowing more fluid to enter the propeller disc, thereby improving propeller propulsion efficiency. The longer the half-duct chord, the better the effect of evenly evening the wake field and increasing propeller flow. However, an excessively long half-duct chord increases the energy-saving guide wheel's inherent resistance. Furthermore, since the inner half-duct 10 has a small radius and therefore a small span (equivalent to the circumference of a circle), a longer chord length of the inner half-duct 10 limits the increase in wetted surface area and reduces the drag. Therefore, increasing the chord length of the inner half-duct 10 outweighs any negative effects. Conversely, the outer half-duct 20 has a large radius and an excessively long chord length, significantly increasing the wetted surface area and drag. Therefore, increasing the chord length of the outer half-duct 20 outweighs any negative effects. Therefore, to reduce the drag of the outer half-duct 20, the chord length should be reduced to minimize the wetted surface area and improve propeller propulsion efficiency.

[0030] The outer stator blades 30 and inner stator blades 40 create pre-swirl in the propeller's inlet flow, thereby reducing propeller rotational energy loss. Specifically, the outer stator blades 30 and inner stator blades 40 cause the flow ahead of the propeller to rotate in the opposite direction of the propeller's rotation. This reduces rotational energy loss during propeller operation and reduces the propeller's required power after disembarking at the same sailing speed, thereby saving energy and reducing emissions.

[0031] The inner stator blades 40 provided on the port side of the stern portion of the hull and the outer stator blades 30 provided on the port side of the stern portion of the hull may be provided integrally or not.

[0032] When the inner stator blades 40 arranged on the port side of the stern of the hull are integrally arranged with the outer stator blades 30 arranged on the port side of the stern of the hull, the tips of the inner stator blades 40 pass through the inner half duct 10 and are fixedly connected to the inner wall of the outer half duct 20.

[0033] When the inner stator blades 40 and the outer stator blades 30 on the port side of the stern are not integrally arranged, due to the small inner space and the large outer space, the number of inner stator blades 40 on the port side of the stern needs to be smaller than the number of outer stator blades 30 on the port side of the stern, and the inner stator blades 40 on the port side of the stern and the outer stator blades 30 on the port side of the stern need to be arranged at different circumferential installation angles and twist angles. However, the number of outer stator blades 30 on the port side of the stern and the number of inner stator blades 40 on the port side of the stern should not be too few or too many. Too few stator blades will not produce enough pre-swirl, while too many stator blades will easily produce a cascade effect. For example, two inner stator blades 40 and three outer stator blades 30 may be provided on the port side of the stern of the hull, and three inner stator blades 40 and four outer stator blades 30 may also be provided on the port side of the stern of the hull. Figure 1 The schematic diagram shows a situation where three inner stator blades 40 and four outer stator blades 30 are provided on the port side of the stern of the hull, and one inner stator blade 40 is provided on the starboard side of the stern of the hull 50 . Figure 2 For the present invention Figure 1 A front view of an energy-saving guide wheel is provided. For example, by arranging two layers of stator blades at different angles at the stern of a ship, interference between the outer stator blades 30 and the inner stator blades 40 can be reduced. This can also change the direction of the tangential velocity on the port side of the stern of the hull, increase propeller inlet flow pre-swirl, improve propeller efficiency, and reduce ship wake losses.

[0034] The energy-saving guide wheel provided in an embodiment of the present invention includes an inner half-duct, an outer half-duct, multiple outer stator blades and multiple inner stator blades; by setting the root of the inner stator blade to be fixedly connected to the stern of the hull, and the tip of the inner stator blade to be fixedly connected to the inner wall of the inner half-duct; the root of the outer stator blade is fixedly connected to the outer wall of the inner half-duct, and the tip of the outer stator blade is fixedly connected to the inner wall of the outer half-duct, the strength of the stator blade can be increased, the vibration of the stator blade can be reduced, and the structural reliability of the energy-saving device can be improved; by setting the chord length of the outer half-duct to be smaller than the chord length of the inner half-duct, the wet surface area of ​​the outer half-duct can be reduced, the self-resistance of the energy-saving guide wheel can be reduced, and the propulsion efficiency of the ship can be improved.

[0035] Continue to refer Figure 1The energy-saving guide wheel also includes an outer semi-duct fixed support 60, and the outer semi-duct 20 is fixedly connected to the stern 50 of the hull through the outer semi-duct fixed support 60. By providing the outer semi-duct fixed support 60, the strength of the energy-saving guide wheel can be increased and the structural reliability of the energy-saving guide wheel can be improved. Before installation, the shape of the outer semi-duct fixed support 60 is designed based on the yield strength of the energy-saving guide wheel meeting the specification requirements, the excitation frequency of the propeller and the natural frequency of the front energy-saving device, where the excitation frequency of the propeller is F1 and the natural frequency of the energy-saving guide wheel is F2, then F2 < 0.7F1, or F2 > 1.3F1.

[0036] In a preferred embodiment, the strength of the energy-saving guide wheel is evaluated by finite element simulation calculation. On the premise that the yield strength meets the requirements of the specification, finite element simulation is applied, combined with the Lanczos method and the fluid boundary element method, to simulate the energy-saving guide wheel to obtain the natural frequency F2.

[0037] Furthermore, when calculating the natural frequency, the calculation formula of the natural frequency is:

[0038]

[0039] k is related to the energy-saving guide wheel's structural layout, material specifications, and hull connection method; m is related to the energy-saving guide wheel's structural material specifications. Factors affecting the energy-saving guide wheel's vibration include the propeller's excitation frequency and the natural frequency of the energy-saving guide wheel. If the two frequencies are close, resonance damage will occur, so the two natural frequencies need to be staggered. A stagger of more than 30% will prevent resonance damage. Generally, the propeller's excitation frequency remains unchanged, so staggering the natural frequency of the energy-saving guide wheel can only be achieved by changing the natural frequency of the energy-saving guide wheel. According to the natural frequency calculation formula, the natural frequency is related to the stiffness coefficient k and the weight m. k is related to the energy-saving guide wheel's structural layout, material specifications, and connection method to the hull; m is related to the energy-saving guide wheel's structural material specifications. First, calculations verify that the energy-saving guide wheel meets the structural yield strength requirements and also meets the frequency staggering requirements. The connection method for the front guide wheel has little impact on the energy-saving effect. Therefore, it is necessary to find an appropriate structural layout, material specifications, and connection method to achieve structural lightweighting. The energy-saving guide wheel and outer half-duct fixed support 60 are designed to improve energy efficiency. Finite element simulation is used to evaluate the strength of the specifications of the energy-saving guide wheel and the outer half-duct fixed support 60. Under the premise of meeting the yield strength, the energy-saving guide wheel and the outer half-duct fixed support 60 are accurately simulated and calculated to obtain the natural frequency. The offset value with the propeller excitation frequency is then evaluated to avoid resonance. This results in the appropriate structural layout and material specifications for the energy-saving guide wheel.

[0040] In this embodiment, the chord length of the inner half duct 10 is greater than the chord length of the inner stator blade 40 and greater than the chord length of the outer stator blade 30 ; the chord length of the outer half duct 20 is less than the chord length of the outer stator blade 30 .

[0041] The arc angle range of the inner half-duct 10 is 70° to 130°, the ratio of the radius of the inner half-duct 10 to the propeller radius is 0.25 to 0.5, and the ratio of the chord length of the outer half-duct to the chord length of the outer stator blades is 0.2 to 0.6. The arc angle range of the outer half-duct 10 is 50° to 100°. By controlling the circumferential angle range and radius of the inner half-duct 10, and by ensuring that the chord length of the outer half-duct is shorter than the chord length of the outer stator blades 30, the wetted surface area of ​​the energy-saving guide wheel can be reduced, reducing the self-resistance of the energy-saving guide wheel and improving the propulsion efficiency of the ship.

[0042] Figure 3 A schematic structural diagram of another energy-saving guide wheel provided in an embodiment of the present invention is shown in FIG. Figure 3 As shown, the energy-saving guide wheel includes: an inner half-duct 10, an outer half-duct 20, a plurality of outer stator blades 30 and a plurality of inner stator blades 40; the chord length of the outer half-duct 20 is smaller than the chord length of the inner half-duct 10; the inner stator blades 40 are circumferentially dispersed, and one or two inner stator blades 40 are arranged on the starboard side of the stern 50 of the hull, and the remaining inner stator blades 40 are arranged on the port side of the stern 50 of the hull; the root of the inner stator blade 40 is fixedly connected to the stern of the hull, and the tip of the inner stator blade 40 is fixedly connected to the inner wall of the inner half-duct 10; the outer stator blades 30 are circumferentially dispersed on the port side of the stern 50 of the hull, and the root of the outer stator blade 30 is fixedly connected to the outer wall of the inner half-duct 10, and the tip of the outer stator blade 30 is fixedly connected to the inner wall of the outer half-duct 20. The number of the inner stator blades arranged on the port side of the stern of the hull is the same as the number of the outer stator blades arranged on the port side of the stern of the hull, and the inner stator blades 40 arranged on the port side of the stern of the hull and the outer stator blades 30 arranged on the port side of the stern of the hull are arranged as one piece.

[0043] The inner stator blade 40 disposed on the port side of the stern portion of the hull or the outer stator blade 30 disposed on the port side of the stern portion of the hull includes a first stator blade 11 , a second stator blade 12 and a third stator blade 13 .

[0044] The energy-saving guide wheel also includes an outer half-duct fixed support 60, and the outer half-duct 20 is fixedly connected to the stern 50 of the hull through the outer half-duct fixed support 60.

[0045] Figure 4 For the present invention Figure 3 A front view of an energy-saving guide wheel is provided. Figure 4As shown, the angle between the first stator blade 11 and the mid-longitudinal section of the stern of the hull is in the range of 60° to 85°; the angle between the second stator blade 12 and the mid-longitudinal section of the stern of the hull is in the range of 30° to 60°; and the angle between the third stator blade 13 and the mid-longitudinal section of the stern of the hull is in the range of 0° to 30°.

[0046] Continue to refer Figure 4 When an inner stator blade 40 is provided on the starboard side of the stern portion 50 of the hull, the included angle of the middle longitudinal section of the inner stator blade 40 at the stern portion of the hull is in the range of 0° to 30°.

[0047] In this embodiment, the chord length of the inner half-duct 10 is greater than the chord length of any inner stator blade 40 or greater than the chord length of any outer stator blade 30; the chord length of the outer half-duct 20 is less than the chord length of any inner stator blade 40 or less than the chord length of any outer stator blade 30.

[0048] An embodiment of the present invention further provides a ship, which includes the energy-saving guide wheel of any of the above embodiments and has corresponding functional modules and beneficial effects of the energy-saving guide wheel.

[0049] The present invention also provides a design evaluation method for an energy-saving device. The energy-saving device includes a front guide vane, a front duct, a combination of a front guide vane and a duct, a hub cap fin, a reaction rudder, a rudder bulb, and a rudder additional fin. The performance evaluation method of the energy-saving device using computational fluid dynamics (CFD) can be divided into the following two types according to the type of energy-saving device:

[0050] 1) Energy-saving devices integrated with the propeller, such as hub vortex suppressors, can be considered as part of the propeller. Therefore, when evaluating their performance, the energy-saving effect can be obtained by comparing the open water efficiency of the propeller with and without hub vortex suppressors. The parameters are defined as follows:

[0051]

[0052] Among them: K T0 ,K Q0 ,η0 respectively represent the thrust coefficient, torque coefficient and open water efficiency of the propeller when the conventional propeller cap is installed; and K' T ,K' Q ,η' respectively represent the thrust coefficient, torque coefficient and open water efficiency when the propeller is equipped with vortex-eliminating fins.

[0053] 2) Energy-saving devices installed on the hull or rudder are considered part of the ship's appendages when evaluating their energy-saving effects. Therefore, when evaluating the energy-saving effects, it is necessary to perform self-propulsion calculations for the ship at the same speed with and without the energy-saving device installed, and obtain the hydrodynamic performance of the ship in both cases. Then, based on the propeller received power obtained from the CFD numerical calculation of the hull + rudder + propeller without the energy-saving device installed, if the propeller received power after the energy-saving device is installed is less than that of the prototype at the same speed, the energy-saving device has an energy-saving effect. The main process of CFD evaluation is as follows:

[0054] 1) Calculation and analysis of hull resistance and flow field with and without energy-saving devices;

[0055] 2) Calculation and analysis of ship self-propulsion performance with and without energy-saving devices;

[0056] 3) At the design speed, a series of ship self-propulsion calculations are performed by changing the propeller speed. The new equilibrium point is obtained by comparing the hull resistance and propeller thrust at different propeller speeds, and then the hull resistance, propeller hydrodynamic force, and propeller received power at the self-propulsion point of the ship model are obtained;

[0057] 4) By comparing the propeller power received with and without the energy-saving device, the energy-saving effect of the energy-saving device can be obtained.

[0058] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An energy-saving guide wheel, characterized in that: include: An inner half duct, an outer half duct, a plurality of outer stator blades and a plurality of inner stator blades; The outer layer half duct is arranged on the port side of the stern of the hull; The chord length of the outer half-duct is smaller than the chord length of the inner half-duct; The inner stator blades are circumferentially dispersed, and one or two of the inner stator blades are arranged on the starboard side of the stern of the hull, and the remaining inner stator blades are arranged on the port side of the stern of the hull; the roots of the inner stator blades are fixedly connected to the stern of the hull, and the tips of the inner stator blades are fixedly connected to the inner wall of the inner semi-duct; The outer stator blades are circumferentially dispersedly arranged on the port side of the stern of the hull, the roots of the outer stator blades are fixedly connected to the outer wall of the inner half-duct, and the tips of the outer stator blades are fixedly connected to the inner wall of the outer half-duct.

2. The energy-saving guide wheel according to claim 1, characterized in that: The number of the inner stator blades arranged on the port side of the stern of the hull is less than the number of the outer stator blades arranged on the port side of the stern of the hull, and the inner stator blades arranged on the port side of the stern of the hull and the outer stator blades arranged on the port side of the stern of the hull are arranged to have different circumferential installation angles and twisting angles.

3. The energy-saving guide wheel according to claim 1, characterized in that: The number of the inner stator blades arranged on the port side of the stern of the hull is the same as the number of the outer stator blades arranged on the port side of the stern of the hull, and the inner stator blades arranged on the port side of the stern of the hull and the outer stator blades arranged on the port side of the stern of the hull are arranged integrally.

4. The energy-saving guide wheel according to claim 3, characterized in that: The inner stator blades arranged on the port side of the stern of the hull or the outer stator blades arranged on the port side of the stern of the hull include a first stator blade, a second stator blade and a third stator blade.

5. The energy-saving guide wheel according to claim 4, characterized in that: The range of the included angle between the first stator blade and the mid-longitudinal section of the stern of the hull is 60°~85°; the range of the included angle between the second stator blade and the mid-longitudinal section of the stern of the hull is 30°~60°; the range of the included angle between the third stator blade and the mid-longitudinal section of the stern of the hull is 0°~30°.

6. The energy-saving guide wheel according to claim 1, characterized in that: The inner stator blades arranged on the port side of the stern of the hull are not arranged in an integrated manner with the outer stator blades arranged on the port side of the stern of the hull; the chord length of the inner half duct is greater than the chord length of the inner stator blades and greater than the chord length of the outer stator blades; the chord length of the outer half duct is less than the chord length of the outer stator blades; or, The inner stator blades arranged on the port side of the stern of the hull are integrally arranged with the outer stator blades arranged on the port side of the stern of the hull; the chord length of the inner half-duct is greater than the chord length of any of the inner stator blades or greater than the chord length of any of the outer stator blades; the chord length of the outer half-duct is less than the chord length of any of the inner stator blades or less than the chord length of any of the outer stator blades.

7. The energy-saving guide wheel according to claim 1, characterized in that: The arc angle range corresponding to the inner half-duct is 70° to 130°, and the ratio of the radius of the inner half-duct to the radius of the propeller is in the range of 0.25 to 0.

5.

8. The energy-saving guide wheel according to claim 1, characterized in that: The ratio of the chord length of the outer layer half duct to the chord length of the outer layer stator blade is in the range of 0.2 to 0.6; the arc angle corresponding to the outer layer half duct is in the range of 50° to 100°.

9. The energy-saving guide wheel according to claim 1, characterized in that: It also includes an outer layer half-duct fixing support, through which the outer layer half-duct is fixedly connected to the stern of the hull.

10. A ship, characterized in that: Including the energy-saving guide wheel as described in any one of claims 1-9.

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