Ocean energy utilization blade design method and rotating wheel designed through ocean energy utilization blade design method

Abstract

The invention discloses an ocean energy utilization blade design method and a rotating wheel designed through the ocean energy utilization blade design method. The ocean energy utilization blade obtained based on the lift-drag combined design thought of the spherical contour is composed of a spiral blade, an upper boosting blade and a lower boosting blade. The helical blade is determined by the initial airfoil profile line along the helical blade scanning path line; the upper boosting blade and the lower boosting blade are connected to the upper end and the lower end of the spiral blade respectively and are determined by lofting of a water bucket type molded line along a spherical arc guide line. The rotating wheel is formed by integrally connecting three groups of blades, a central rotating shaft, an upper end plate and a lower end plate in a spherical surface manner; the three groups of sea blades are uniformly distributed on the spherical contour; the central rotating shaft is connected with the upper and lower end plates to support and rotate; the upper and lower end plates play a supporting and fixing role and are connected with the power generation device. The rotating wheel can efficiently and stably operate in the environment of omni-directional low-flow-speed flowing such as deep sea, and has the advantages of omni-directional response to non-directional ocean current incoming flow, high self-starting performance and operation stability, optimized structural parameters and efficient operation.

Description

Technical Field

[0001] The invention belongs to the technical field of deep sea low-speed water flow energy engineering, and in particular relates to a method for designing ocean energy utilizing blades and a designed runner. Background Art

[0002] With the continuous pursuit of renewable energy, ocean current energy, as a clean and renewable form of energy, is gradually attracting global attention. For ocean currents with high flow rate, stable flow direction and relatively dense energy, axial flow turbines have become the main equipment for efficient power generation. However, in deep sea areas with low flow rate, unstable flow direction and dispersed energy, traditional power generation equipment is often difficult to operate stably and has low efficiency. Therefore, developing a device with strong adaptability, high stability and efficient power generation at low flow rate has become an important research direction in the current field of ocean current energy utilization. Darrieus impeller, a classic wind power generation device, has been tried to be used for underwater power generation in recent years. Its vertical axis design enables the impeller to effectively utilize the energy flowing in all directions. However, due to structural reasons, the impeller has large torque fluctuations within one rotation cycle, which has an adverse effect on its startup and continuous stable operation. Summary of the invention

[0003] The purpose of the present invention is to provide a method for designing ocean energy utilization blades and a designed runner, wherein the designed blades can realize omnidirectional response to non-directional ocean currents while having the functions of high self-starting, strong operating stability, and high energy conversion efficiency. The runner adopts a unique spherical structure design, and realizes efficient utilization of omnidirectional ocean currents through the combination of spiral blades, booster blades, a central shaft, and upper and lower end plates. Among them, the design of the spiral blades enables the runner to maintain a stable torque output under different incoming flow angles, while the booster blades enhance the stability and self-starting of the runner. In addition, the central shaft and the upper and lower end plates of the runner provide solid support for the entire structure, enabling it to operate stably in harsh environments such as the deep sea.

[0004] The first aspect of the present invention proposes a method for designing ocean energy utilization blades, which is used to design ocean energy utilization blades. The designed blades can achieve omnidirectional response to non-directional ocean currents while having the functions of high self-starting, strong operating stability, and high energy conversion efficiency.

[0005] The design method comprises the following steps:

[0006] Determining a spherical profile, the ocean energy utilization blade having a spherical profile determined by a given radius;

[0007] Determine a central rotation axis, which is located at the axis of the spherical profile and is in the form of an elongated cylinder and is determined by a given length and radius;

[0008] Determine an upper end plate, which is located at the upper end of the central shaft and the top of the spherical profile and is a flat cylinder, and the lower end surface of the upper end plate coincides with and is concentrically connected to the upper end surface of the central shaft, and is determined by a given length and radius;

[0009] Determine a lower end plate, the lower end plate consists of two parts, both of which are flat cylinders, the upper half is located at the lower end of the central shaft and the bottom of the spherical profile, and the lower half is located outside the bottom of the spherical profile, the upper end surface of the lower end plate coincides with the lower end surface of the central shaft and is concentrically connected, and is determined by a given length and radius;

[0010] Determine a spiral blade, wherein the spiral blade is evenly distributed in three equal parts on the spherical profile of the runner and is determined by a starting airfoil line along a spiral blade scanning path line;

[0011] Determine a booster blade, one end of which is connected to the port of the spiral blade, and the other end of which is connected to the upper end plate or the lower end plate, by lofting a projection curve of the booster blade plane water-peel line on the cylindrical surface of the upper end plate and a projection curve of the booster blade plane water-peel line on the spiral blade along the projection curve of the booster blade plane guide line on the spherical contour;

[0012] Due to the design limitations of traditional underwater impellers, these impellers experience significant torque fluctuations during a complete rotation cycle. This torque instability not only affects the impeller's startup process, but also constitutes an obstacle to its long-term stable operation. The blades obtained by the ocean energy utilization blade design method of the first embodiment of the present invention can maintain a stable torque output under different incoming flow angles, and the presence of booster blades enhances the stability and self-starting of the overall device. In addition, the flexible design process leaves enough room for the optimal design of the blades, and the energy conversion efficiency can be significantly improved through reasonable parameter configuration.

[0013] In some embodiments, the radius of the spherical profile is determined by the design requirements of the wheel:

[0014]

[0015] Wherein, R is the radius of the spherical profile, P is the design power, η is the efficiency of the runner, ρ is the fluid density, and V is the fluid velocity.

[0016] In some embodiments, the relationship between the given length and radius of the central axis of rotation is determined as:

[0017]

[0018] Among them, L z is the length of the central axis, R zis the radius of the central axis, R is the radius of the spherical profile, λ l and λ r are respectively the length ratio and the radius ratio of the central rotation axis.

[0019] In some embodiments, the relationship between the given length and radius of the upper end plate is determined as:

[0020]

[0021] Among them, L u is the length of the upper end plate, R u is the radius of the upper end plate, R is the radius of the spherical profile, u l and u r are respectively the length ratio and the radius ratio of the upper end plate.

[0022] In some embodiments, the given length and radius of the upper half of the lower end plate are equal to the given length and radius of the upper end plate, and the relationship between the given length and radius of the lower half of the lower end plate is determined as:

[0023]

[0024] Among them, L d is the length of the lower half of the lower end plate, R d is the radius of the lower half of the lower end plate, R is the radius of the spherical profile, d l and d r are respectively the length ratio and the radius ratio of the lower half of the lower end plate.

[0025] In some embodiments, the spiral blade is determined by a starting airfoil line along a spiral blade scanning path line, and the starting airfoil line is:

[0026]

[0027] Wherein, P is the spherical coordinate of the center point of the starting airfoil line, φ c is the horizontal angle, θ c is the vertical angle, the starting airfoil line is located on the XOY parallel plane passing through point P, x is the horizontal coordinate of the starting airfoil line, y is u is the ordinate of the upper half of the starting airfoil line, y d is the ordinate of the lower half of the starting airfoil line. The starting airfoil line equation may be a NACA airfoil, a Gottingen airfoil, a RAF-6 airfoil, or the like.

[0028] The spiral blade scanning path line is:

[0029]

[0030] Where R is the radius of the spherical profile, (N x ,0,N z ) is the out-of-plane normal coordinate of the spiral blade scanning path line of the spiral blade.

[0031] In some embodiments, the booster blade is determined by lofting the cylindrical surface projection curve of the booster blade plane water-penetrating line on the upper end plate and the projection curve of the booster blade plane water-penetrating line on the spiral blade along the projection curve of the booster blade plane guide line on the spherical contour. The equation of the cylindrical surface projection curve of the booster blade plane water-penetrating line on the upper end plate is:

[0032]

[0033] Among them, Y u and Y d They are the upper and lower curves on the water-penetrating line of the booster blade plane, located on the plane cos(φ c )x+sin(φ c )y=0.

[0034] The projection curve of the booster blade plane guide line on the spherical contour is:

[0035]

[0036] Among them, Y2 is the booster blade plane guide line, located on the plane cos(θ c )x+sin(θ c )z=0.

[0037] The second aspect of the present invention further provides a rotating wheel.

[0038] According to the embodiment of the present invention, the runner comprises ocean energy utilization blades, and the ocean energy utilization blades are designed according to the ocean energy utilization blade design method according to any embodiment of the first aspect of the present invention.

[0039] The impeller of the second embodiment of the present invention adopts the ocean energy utilization blade designed by the ocean energy utilization blade design method of any embodiment of the first aspect of the present invention, and therefore can achieve efficient and stable operation in omnidirectional low-flow environments such as the deep sea, and has the advantages of omnidirectional response to non-directional ocean currents, high self-starting and operating stability, and efficient operation with optimized structural parameters.

[0040] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the three-dimensional structure of a rotating wheel according to an embodiment of the present invention;

[0042] Figure 2 A schematic diagram of the spiral blade structure of an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the booster blade structure of an embodiment of the present invention.

[0044] Reference numerals:

[0045] 1000-Ocean energy utilization rotor (hereinafter referred to as rotor);

[0046] 1-spherical profile; 2-central axis; 3-upper end plate; 4-upper part of lower end plate; 5-lower part of lower end plate; 6-spiral blade; 7-boost blade;

[0047] I-rotation axis centerline; II-starting airfoil line; III-process airfoil line; IV-sweep path line of spiral blade IV; V-boost blade plane water bucket line; VI-boost blade plane water bucket line; VII-boost blade plane guide line;

[0048] A-starting airfoil surface; B-terminating airfoil surface; C-scanning path plane; D-mid-vertical plane of the central axis; E-boost blade guide plane. DETAILED DESCRIPTION

[0049] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0050] Combine the following Figures 1 to 3 A method for designing ocean energy utilization blades and a designed runner thereof according to an embodiment of the present invention will be described.

[0051] The present invention provides a method for designing ocean energy utilization blades and a designed rotor. The ocean energy utilization blades designed based on the lift-drag combination design concept of the spherical contour are composed of a spiral blade and an upper and lower booster blade; the spiral blade is determined by the starting airfoil line along the spiral blade scanning path line; the upper and lower booster blades are respectively connected to the upper and lower ends of the spiral blade, and are determined by the bucket-type line along the spherical arc guide line. The rotor composed of the ocean energy utilization blades is composed of three groups of ocean energy utilization blades, a central rotating shaft, and an upper and lower end plate connected as a whole in a spherical shape; the three groups of ocean energy utilization blades are evenly distributed on the spherical contour; the central rotating shaft is connected to the upper and lower end plates to support rotation; the upper and lower end plates play a supporting and fixing role, and can be further connected to the power generation device. The specific contents are as follows:

[0052] The first aspect of the present invention proposes a method for designing ocean energy utilization blades, and designs the blades based on a lift-drag combination method of a spherical profile. The blade has a spherical profile as a whole, and uses a lift-type blade as the main working component. At the same time, an impact connecting rod blade is used to boost the lift blade to improve the self-starting performance and operating stability. During the design, after determining the spherical profile, the central shaft, the upper end plate, the lower end plate, the spiral blade and the booster blade in sequence, a complete ocean energy utilization blade can be formed.

[0053] like Figures 1 to 3 As shown, according to the first aspect of the present invention, the method for designing a marine energy utilization blade is used to design a marine energy utilization blade, which is composed of a spiral blade 6 and two upper and lower booster blades 7; the spiral blade 6 is determined by the starting airfoil line II along the spiral blade scanning path line IV; the upper and lower booster blades are respectively connected to the upper and lower ends of the spiral blade 6, and the other ends are connected to the upper end plate 3 and the lower end plates 4 and 5, and the cylindrical surface projection curve of the booster blade plane water bucket line V on the upper end plate 3 and the cylindrical surface projection curve of the booster blade plane water bucket line VI on the spiral blade The projection curve on the blade 6 is determined by lofting the projection curve of the booster blade plane guide line Ⅶ on the spherical contour 1; three spiral blades 6, three booster blades 7 on the upper and lower sides, a central shaft 2, and the upper end plate 3 and the lower end plates 4, 5 are connected as a whole to the spherical contour 1; the three spiral blades 6 are evenly distributed on the spherical contour 1 in three equal parts; the central shaft 2 is connected to the upper end plate 3 and the lower end plate 4, and plays a supporting and rotating role, which is determined by circular surface stretching; the upper end plate 3 and the lower end plates 4, 5 play a supporting and fixing role, and can be further connected to the power generation device, which is determined by circular surface stretching.

[0054] like Figures 1 to 3 As shown, the ocean energy utilization blade design method of the first embodiment of the present invention includes the following steps:

[0055] Determining a spherical profile 1, the ocean energy utilization blade has a spherical profile 1, which is determined by a given radius;

[0056] Determine a central rotation axis 2, which is located at the axis of the spherical profile and is in the form of an elongated cylinder and is determined by a given length and radius;

[0057] Determine an upper end plate 3, which is located at the upper end of the central shaft 2 and the top of the spherical profile 1 and is in the form of a flat cylinder. The lower end surface of the upper end plate 3 coincides with and is concentrically connected to the upper end surface of the central shaft 2 and is determined by a given length and radius;

[0058] Determine the lower end plates 4 and 5. The lower end plates 4 and 5 are composed of two parts, both of which are flat cylinders. The upper part 4 is located at the lower end of the central shaft 2 and the bottom of the spherical profile 1, and the lower part 5 is located outside the bottom of the spherical profile 1. The upper end surface of the lower end plate 5 coincides with the lower end surface of the central shaft 2 and is concentrically connected, and is determined by a given length and radius;

[0059] Determine a spiral blade 6, wherein the spiral blade 6 is evenly distributed in three equal parts on the spherical profile 1, and is determined by a starting airfoil line II along a spiral blade scanning path line IV;

[0060] Determine the booster blade 7, one end of which is connected to the port of the spiral blade 6, and the other end of which is connected to the upper end plate 3 or the lower end plate 4, by lofting the projection curve of the booster blade plane Pelton line V on the cylindrical surface of the upper end plate 3 and the projection curve of the booster blade plane Pelton line VI on the spiral blade 6 along the projection curve of the booster blade plane guide line VII on the spherical contour 1;

[0061] Due to the design limitations of traditional underwater impellers, these impellers experience significant torque fluctuations during a complete rotation cycle. This torque instability not only affects the impeller's startup process, but also constitutes an obstacle to its long-term stable operation. The blades obtained by the ocean energy utilization blade design method of the first embodiment of the present invention can maintain a stable torque output under different incoming flow angles, and the presence of booster blades enhances the stability and self-starting of the overall device. In addition, the flexible design process leaves enough room for the optimal design of the blades, and the energy conversion efficiency can be significantly improved through reasonable parameter configuration.

[0062] In some embodiments, the radius of the spherical profile 1 is determined by the design requirements of the rotating wheel:

[0063]

[0064] Wherein, R is the radius of the spherical profile 1, P is the design power, η is the efficiency of the runner, ρ is the fluid density, and V is the fluid velocity.

[0065] In some embodiments, the relationship between the given length and radius of the central rotation axis 2 is determined as follows:

[0066]

[0067] Among them, L z is the length of the central axis 2, R z is the radius of the central axis 2, R is the radius of the spherical profile 1, λ l and λ r are respectively the length ratio and the radius ratio of the central rotation axis 2.

[0068] In some embodiments, the relationship between the given length and radius of the upper end plate 3 is determined as follows:

[0069]

[0070] Among them, L u is the length of the upper end plate 3, R u is the radius of the upper end plate 3, R is the radius of the spherical profile 1, u l and u r are respectively the length ratio and the radius ratio of the upper end plate 3 .

[0071] In some embodiments, the given length and radius of the upper half 4 of the lower end plate are equal to the given length and radius of the upper end plate 3, and the relationship between the given length and radius of the lower half 5 of the lower end plate is determined as follows:

[0072]

[0073] Among them, L d is the length of the lower half 5 of the lower end plate, R d is the radius of the lower half of the lower end plate 5, R is the radius of the spherical profile 1, d l and d r They are respectively the length ratio and the radius ratio of the lower half 5 of the lower end plate.

[0074] In some embodiments, the spiral blade 6 is determined by a starting airfoil line II along a spiral blade scanning path line IV, and the starting airfoil line II is:

[0075]

[0076] Wherein, P is the spherical coordinate of the center point of the starting airfoil line II, φ c is the horizontal angle, θ c is the vertical angle, the starting airfoil line II is located on the XOY parallel plane passing through point P, x is the horizontal coordinate of the starting airfoil line II, y is u is the ordinate of the upper half of the starting airfoil line II, y d is the ordinate of the lower half of the starting airfoil line II. The equation of the starting airfoil line II can be a NACA airfoil, a Gottingen airfoil, a RAF-6 airfoil, etc.

[0077] The spiral blade scanning path line IV is:

[0078]

[0079] Wherein, R is the radius of the spherical profile 1, (N x,0,N z ) is used to determine the out-of-plane normal coordinate of the spiral blade scanning path line IV of the spiral blade 6.

[0080] In some embodiments, the booster blade 7 is determined by lofting the cylindrical surface projection curve of the booster blade plane Pelton line V on the upper end plate 3 and the projection curve of the booster blade plane Pelton line VI on the spiral blade 6 along the projection curve of the booster blade plane guide line VII on the spherical profile 1. The cylindrical surface projection curve equation of the booster blade plane Pelton line V on the upper end plate 3 is:

[0081]

[0082] Among them, Y u and Y d They are the upper and lower curves of V on the water-penetrating line of the booster blade plane, located on the plane cos(φ c )x+sin(φ c )y=0.

[0083] The projection curve of the booster blade plane guide line VII on the spherical profile 1 is:

[0084]

[0085] Among them, Y2 is the booster blade plane guide line VII, located on the plane cos(θ c )x+sin(θ c )z=0.

[0086] The second aspect of the present invention further provides a rotating wheel.

[0087] According to the embodiment of the second aspect of the present invention, the runner comprises ocean energy utilization blades, and the ocean energy utilization blades are designed according to the ocean energy utilization blade design method of any embodiment of the first aspect of the present invention.

[0088] The impeller of the second embodiment of the present invention adopts the ocean energy utilization blade designed by the ocean energy utilization blade design method of any embodiment of the first aspect of the present invention, and therefore can achieve efficient and stable operation in omnidirectional low-flow environments such as the deep sea, and has the advantages of omnidirectional response to non-directional ocean currents, high self-starting and operating stability, and efficient operation with optimized structural parameters.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for designing ocean energy utilization blades, characterized in that: For designing a blade for utilizing ocean energy, the design method comprises the following steps: Determining a spherical profile, the ocean energy utilization blade having a spherical profile determined by a given radius; Determine a central rotation axis, which is located at the axis of the spherical profile and is in the form of an elongated cylinder and is determined by a given length and radius; Determine an upper end plate, which is located at the upper end of the central shaft and the top of the spherical profile and is a flat cylinder, and the lower end surface of the upper end plate coincides with and is concentrically connected to the upper end surface of the central shaft, and is determined by a given length and radius; Determine a lower end plate, the lower end plate consists of two parts, both of which are flat cylinders, the upper half is located at the lower end of the central shaft and the bottom of the spherical profile, and the lower half is located outside the bottom of the spherical profile, the upper end surface of the lower end plate coincides with the lower end surface of the central shaft and is concentrically connected, and is determined by a given length and radius; Determine a spiral blade, wherein the spiral blade is evenly distributed in three equal parts on the spherical profile of the runner and is determined by a starting airfoil line along a spiral blade scanning path line; A booster blade is determined, one end of which is connected to the port of the spiral blade, and the other end of which is connected to the upper end plate or the lower end plate, by lofting a projection curve of the booster blade plane bucket line on the cylindrical surface of the upper end plate and a projection curve of the booster blade plane bucket line on the spiral blade along the projection curve of the booster blade plane guide line on the spherical contour.

2. The method for designing ocean energy utilization blades according to claim 1, characterized in that: The radius of the spherical profile is determined by the design requirements of the runner: Wherein, R is the radius of the spherical profile, P is the design power, η is the efficiency of the runner, ρ is the fluid density, and V is the fluid velocity.

3. The method for designing ocean energy utilization blades according to claim 2, characterized in that: The relationship between the given length and radius of the central axis is determined as follows: Among them, L z is the length of the central axis, R z is the radius of the central axis, R is the radius of the spherical profile, λ l and λ r are respectively the length ratio and the radius ratio of the central rotation axis.

4. The method for designing ocean energy utilization blades according to claim 3, characterized in that: The relationship between the given length and radius of the upper end plate is determined as follows: Among them, L u is the length of the upper end plate, R u is the radius of the upper end plate, R is the radius of the spherical profile, u l and u r are respectively the length ratio and the radius ratio of the upper end plate.

5. The method for designing ocean energy utilization blades according to claim 4, characterized in that: The given length and radius of the upper half of the lower end plate are equal to the given length and radius of the upper end plate, and the relationship between the given length and radius of the lower half of the lower end plate is determined as follows: Among them, L d is the length of the lower half of the lower end plate, R d is the radius of the lower half of the lower end plate, R is the radius of the spherical profile, d l and d r are respectively the length ratio and the radius ratio of the lower half of the lower end plate.

6. The method for designing ocean energy utilization blades according to claim 5, characterized in that: The spiral blade is determined by a starting airfoil line along a spiral blade scanning path line, and the starting airfoil line is: Wherein, P is the spherical coordinate of the center point of the starting airfoil line, φ c is the horizontal angle, θ c is the vertical angle, the starting airfoil line is located on the XOY parallel plane passing through point P, x is the horizontal coordinate of the starting airfoil line, y is u is the ordinate of the upper half of the starting airfoil line, y d is the ordinate of the lower half of the starting airfoil line, the equation of the starting airfoil line is a NACA airfoil, a Gottingen airfoil or a RAF-6 airfoil, The spiral blade scanning path line is: Where R is the radius of the spherical profile, (N x ,0,N z ) is the out-of-plane normal coordinate of the spiral blade scanning path line of the spiral blade.

7. The method for designing ocean energy utilization blades according to claim 6, characterized in that: The booster blade is determined by lofting the cylindrical surface projection curve of the booster blade plane water-penetrating line on the upper end plate and the projection curve of the booster blade plane water-penetrating line on the spiral blade along the projection curve of the booster blade plane guide line on the spherical contour. The equation of the cylindrical surface projection curve of the booster blade plane water-penetrating line on the upper end plate is: Among them, Y u and Y d are respectively the upper and lower part curves of the bucket type line on the booster blade plane, located on the plane cos(φ c )x + sin(φ c )y = 0; The projection curve of the booster blade plane guide line on the spherical contour is: Among them, Y2 is the booster blade plane guide line, located on the plane cos(θ c )x+sin(θ c )z=0.

8. A rotating wheel, characterized in that: A marine energy utilization blade comprising the marine energy utilization blade according to any one of claims 1 to 7.

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