Ducted propeller for an aerodynamic ship

Abstract

The present invention belongs to the field of aerodynamic design of aerodynamic ships, and relates to a ducted propeller for aerodynamic ships. The overall shape of the ducted propeller is a rectangular blade, the root of the blade is round, and the blade section from the root to the tip is composed of multiple ARAD airfoil shapes similar to the wing, and the thickness smoothly transitions from thick to thin, and a certain torsion angle is maintained between each section, so that the airfoil of the blade will not stall during operation, and a larger aerodynamic lift and smaller aerodynamic resistance are generated. By designing the continuous change of the airfoil thickness, the airfoil of the blade is continuously thinned from the root to the tip, and the transition is smooth, which ensures that the propeller has sufficient strength and rigidity during high-speed rotation, and can generate strong thrust, so as to ensure that the aerodynamic ship can sail at high speed on the shoal or water surface.

Description

Technical Field

[0001] The invention belongs to the field of aerodynamic design of aerodynamic ships and relates to a ducted propeller for aerodynamic ships. Background Art

[0002] At present, ducted propellers are rarely used in aerodynamic ships, and there is no precedent for the development of propellers that match 200kw engines. In order to perform patrol tasks in complex waters such as those with many shallows, sharp turns and narrow water surfaces, and to be able to complete patrol and duty tasks in all terrains during the open water period, the drifting ice period without ice floods, and the thin ice freezing period, it is necessary to design a high-performance propeller with a large thrust-to-weight ratio (up to 25N / Kw), light weight (total propeller weight is not more than 20Kg), and low noise (not more than 90dB) for existing aerodynamic ships. Summary of the invention

[0003] The purpose of the present invention is to design an aerodynamic ship ducted propeller to solve the current problems.

[0004] To solve this technical problem, the technical solution of the present invention is:

[0005] An aerodynamic ship ducted propeller, the ducted propeller has three blades, which are evenly distributed around the rotation center of the propeller blades.

[0006] The chord length of the propeller blade is taken as the X-axis, the chord length is perpendicular to the Y-axis, the axis of the propeller blade is taken as the Z-axis, the distance from each section of the propeller blade to the rotation center of the propeller blade is r, the chord length of the airfoil of each section of the propeller blade is b, the angle of each section of the propeller blade relative to the rotation plane of the blade is φ, and the maximum thickness of each section of the propeller blade is c; the axis coordinate of each section of the propeller blade is (X 0 , Y 0 ), the blade shape and structure dimensions meet the following conditions:

[0007] When r is 160-170 mm, b is 170-180 mm, c is 50-55 mm, φ is 30-32°, (X 0 , Y 0 ) is (85, -0.2) to (89, 0);

[0008] When r is 280-290 mm, b is 220-230 mm, c is 30-40 mm, φ is 10-20°, (X 0 , Y 0 ) is (100, -2) to (110, -1);

[0009] When r is 400-500 mm, b is 200-300 mm, c is 20-30 mm, φ is 0-10°, (X0 , Y 0 ) is (110,0) to (120,1);

[0010] When r is 500~600mm, b is 200~300mm, c is 20~30mm, φ is -5~+5°, (X 0 , Y 0 ) is (110, -1) to (120, +1);

[0011] When r is 600~700mm, b is 200~300mm, c is 10~20mm, φ is -10~0°, (X 0 , Y 0 ) is (110, -1) to (120, +1);

[0012] When r is 700~800mm, b is 200~300mm, c is 10~20mm, φ is -10~0°, (X 0 , Y 0 ) is (110, -1) to (120, +1).

[0013] Furthermore, the blade shape and structural dimensions meet the following conditions:

[0014] When r is 163-168 mm, b is 172-176 mm, c is 4-60 mm, φ is 28-35°, (X 0 , Y 0 ) is (80, -1) to (90, 0);

[0015] When r is 283-288 mm, b is 215-217 mm, c is 35-37 mm, φ is 15-20°, (X 0 , Y 0 ) is (105, -1) to (110, 0);

[0016] When r is 400-410 mm, b is 220-230 mm, c is 22-25 mm, φ is 3-6°, (X 0 , Y 0 ) is (110, 0) to (115, 0.5);

[0017] When r is 520~540mm, b is 200~250mm, c is 20~25mm, φ is -1~+1°, (X 0 , Y 0 ) is (113, -0.5) to (116, +0.5);

[0018] When r is 620~650mm, b is 220~240mm, c is 15~17mm, φ is -4~-6°, (X0 , Y 0 ) is (113, -0.1) to (116, 0);

[0019] When r is 730~760mm, b is 220~240mm, c is 10~15mm, φ is -10~-6°, (X 0 , Y 0 ) is (110, -0.2) ~ (120, -0.1).

[0020] Preferably, the blade has the following external structural dimensions:

[0021] When r is 165mm, b is 174mm, c is 51mm, φ is 31°, (X 0 , Y 0 ) is (87.7, -0.16);

[0022] When r is 285mm, b is 216mm, c is 36mm, φ is 18°, (X 0 , Y 0 ) is (109.7, -0.35);

[0023] When r is 405mm, b is 226.7mm, c is 24.6mm, φ is 5.2°, (X 0 , Y 0 ) is (113, 0.09);

[0024] When r is 525mm, b is 230mm, c is 20.6mm, φ is 0°, (X 0 , Y 0 ) is (115, 0);

[0025] When r is 645mm, b is 230mm, c is 16.7mm, φ is -4.5°, (X 0 , Y 0 ) is (115, -0.05);

[0026] When r is 750mm, b is 230mm, c is 12.5mm, φ is -7°, (X 0 , Y 0 ) is (115, -0.05).

[0027] Preferably, the blade has the following external structural dimensions:

[0028] When r is 170mm, b is 175mm, c is 52mm, φ is 32°, (X 0 , Y 0 ) is (88.7, -0.15);

[0029] When r is 290mm, b is 220mm, c is 37mm, φ is 19°, (X 0 , Y 0 ) is (110, -0.5);

[0030] When r is 400 mm, b is 227 mm, c is 24.9 mm, φ is 5.5°, (X 0 , Y 0 ) is (114, 0.10);

[0031] When r is 530 mm, b is 231 mm, c is 20.5 mm, φ is 0.3°, (X 0 , Y 0 ) is (118, 0.5);

[0032] When r is 650mm, b is 231mm, c is 16.9mm, φ is -4.8°, (X 0 , Y 0 ) is (115, -0.16);

[0033] When r is 750mm, b is 231mm, c is 12.8mm, φ is -7.5°, (X 0 , Y 0 ) is (116, -0.15).

[0034] The ducted propeller blades adopt the ARAD airfoil, which are arranged in order from thick to thin from the blade root to the blade tip, and each section has a smooth transition.

[0035] The ducted propeller blade has a rectangular shape, the blade tip is an arc, and the arc radius is 740-770mm.

[0036] The ducted propeller blade material is a composite material.

[0037] The cross section of the duct in the ducted propeller is a NACA0012 airfoil.

[0038] The beneficial effects of the present invention are:

[0039] The ducted propeller adopts a three-blade design. While achieving maximum thrust, a smaller number of blades are used, and the blade material is made of composite materials, thereby reducing the overall weight of the propeller as much as possible.

[0040] The propeller noise is reduced and the comfort of the crew and passengers is improved. The three-blade propeller based on the ARAD airfoil design adopts a rectangular plane shape in the aerodynamic design of the blades to improve the thrust-to-weight ratio. Under the limited power conditions provided, the propeller thrust is greatly improved by using the blade shape data of the present invention.

[0041] The total weight of the propeller is no more than 20Kg, the thrust-to-weight ratio can reach 25N / Kw, and the noise is no more than 90dB. The speed of the aerodynamic ship is greater than 50Km / h. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions implemented in the present invention, the following is a brief explanation of the drawings required to be used in the examples of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0043] Figure 1 It is a schematic diagram of the overall propeller blade appearance;

[0044] Figure 2 It is a schematic diagram of the appearance of a single blade;

[0045] Figure 3 is a parameter diagram of any airfoil section in the present invention;

[0046] Figure 4 It is a three-dimensional schematic diagram of the duct;

[0047] Figure 5 yes Figure 4 Schematic diagram of the middle duct cross section. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 described embodiments are 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 work are within the scope of protection of the present invention.

[0049] The features of various aspects of the embodiments of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to fully understand the present invention. However, it is obvious to those skilled in the art that the present invention can also be implemented without these specific details. The following description of the embodiments is only for a better understanding of the present invention by illustrating examples of the present invention. The present invention is not limited to any specific settings and methods provided below, but covers all product structures, any improvements, replacements, etc. of methods covered without departing from the spirit of the present invention.

[0050] In the various drawings and the following description, well-known structures and technologies are not shown to avoid unnecessary ambiguity of the present invention. The following describes the propeller blades of the present invention by taking the ducted propeller of a certain air patrol boat as an example:

[0051] The cross section of the duct in the ducted propeller is a NACA0012 airfoil, as shown in the schematic diagram Figure 4 and 5 As shown;

[0052] like Figure 1 As shown, there are three propeller blades made of composite materials, evenly distributed around the rotation center of the propeller blades, using ARAD airfoil, arranged in order of thickness from the root to the tip, with smooth transition between each section. The propeller blade has a rectangular shape, the blade tip is an arc, and the arc radius is 750mm.

[0053] Different blade shape data are designed below, and the blade geometric dimension tables are shown in Tables 1 to 6.

[0054] The chord length of the propeller blade is taken as the X-axis, the chord length is perpendicular to the Y-axis, the axis of the propeller blade is taken as the Z-axis, the distance from each section of the propeller blade to the rotation center of the propeller blade is r, the chord length of the airfoil of each section of the propeller blade is b, the angle of each section of the propeller blade relative to the rotation plane of the blade is φ, and the maximum thickness of each section of the propeller blade is c; the axis coordinate of each section of the propeller blade is (X 0 , Y 0 ),like Figure 2 , Figure 3 As shown, the blade dimensions meet the following conditions:

[0055] Table 1

[0056] Section number 1 2 3 4 5 6 r 165 285 405 525 645 750 b 174 216 226.7 230 230 230 c 51 36 24.6 20.6 16.7 12.5 φ <![CDATA[31 O ]]> <![CDATA[18 O ]]> <![CDATA[5.2 O ]]> <![CDATA[0 O ]]> <![CDATA[-4.5 O ]]> <![CDATA[-7 O ]]> <![CDATA[X 0 ]]> 87.7 109.7 113 115 115 115 <![CDATA[Y 0 ]]> -0.16 -0.35 0.09 0 -0.02 -0.05

[0057] Table 2

[0058] Section number 1 2 3 4 5 6 r 166 286 406 526 646 750 b 175 217 226.8 231 231 231 c 50 35 24.5 20.5 16.5 12.4 φ <![CDATA[31.5 O ]]> <![CDATA[18.5 O ]]> <![CDATA[5.7 O ]]> <![CDATA[0 O ]]> <![CDATA[-4.6 O ]]> <![CDATA[-7.5 O ]]> <![CDATA[X 0 ]]> 87.2 109.2 112 114 114 114 <![CDATA[Y 0 ]]> -0.14 -0.34 0.08 0 -0.03 -0.04

[0059] Table 3

[0060] Section number 1 2 3 4 5 6 r 167 287 407 527 647 750 b 176 218 226.9 232 232 232 c 49 34 24.3 20.3 16.3 12.3 φ <![CDATA[31.2 O ]]> <![CDATA[18.2 O ]]> <![CDATA[5.1 O ]]> <![CDATA[0 O ]]> <![CDATA[-4.8 O ]]> -7.2O <![CDATA[X 0 ]]> 87.9 109.9 114 116 116 116 <![CDATA[Y 0 ]]> -0.16 -0.35 0.09 0 -0.02 -0.05

[0061] Table 4

[0062] Section number 1 2 3 4 5 6 r 168 288 408 528 648 750 b 177 219 226.0 233 233 233 c 51 36 24.6 20.6 16.7 12.5 φ <![CDATA[31 O ]]> <![CDATA[18 O ]]> <![CDATA[5.2 O ]]> <![CDATA[0 O ]]> <![CDATA[-4.5 O ]]> <![CDATA[-7 O ]]> <![CDATA[X 0 ]]> 90 110 118 118 118 118 <![CDATA[Y 0 ]]> -0.22 -0.45 0.19 0 -0.12 -0.15

[0063] Table 5

[0064] Section number 1 2 3 4 5 6 r 169 289 409 529 649 750 b 179 220 230 239 239 239 c 51 36 24.6 20.6 16.7 12.5 φ <![CDATA[31 O ]]> <![CDATA[18 O ]]> <![CDATA[5.2 O ]]> <![CDATA[0 O ]]> <![CDATA[-4.5 O ]]> <![CDATA[-7 O ]]> <![CDATA[X 0 ]]> 89 120 123 125 125 125 <![CDATA[Y 0 ]]> -0.20 -0.37 0.17 0 -0.22 -0.25

[0065] Table 6

[0066] Section number 1 2 3 4 5 6 r 170 290 410 530 650 750 b 179 220 231 235 235 235 c 51 36 24.6 20.6 16.7 12.5 φ <![CDATA[30 O ]]> <![CDATA[17 O ]]> <![CDATA[4.2 O ]]> <![CDATA[0 O ]]> <![CDATA[-4.5 O ]]> <![CDATA[-8 O <!-- 4 -->]]> <![CDATA[X 0 ]]> 91 111.7 112 120 120 120 <![CDATA[Y 0 ]]> -0.19 -0.39 0.13 0 -0.14 -0.18

[0067] In the above embodiments, the total weight of the propeller is not more than 20Kg, the thrust-to-weight ratio can reach at least 25N / Kw (Table 1 can reach 25.2N / Kw, Table 2 can reach 25.0N / Kw, Table 3 can reach 25.42N / Kw, Table 4 can reach 25.15N / Kw, Table 5 can reach 25.38N / Kw, Table 6 can reach 25.46N / Kw), and the noise is not more than 90dB (Table 1 is 89.65dB, Table 2 is 89.72dB, Table 3 is 89.78dB, Table 4 is 89.85dB, Table 5 is 89.95dB, Table 6 is 89.98dB). The speed of the air powered boat is greater than 50 km / h (Table 1 can reach 52.5 km / h, Table 2 can reach 50.5 km / h, Table 3 can reach 52.3 km / h, Table 4 can reach 51 km / h, Table 5 can reach 51.2 km / h, Table 6 can reach 50 km / h). The blade of the present invention can also be applied to hovercraft.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A ducted propeller for an aerodynamic ship, Features: The ducted propeller has three blades, which are evenly distributed around the rotation center of the propeller blades. The chord length of the propeller blade is taken as the X-axis, the chord length is perpendicular to the Y-axis, the axis of the propeller blade is taken as the Z-axis, the distance from each section of the propeller blade to the rotation center of the propeller blade is r, the chord length of the airfoil of each section of the propeller blade is b, the angle of each section of the propeller blade relative to the rotation plane of the blade is φ, and the maximum thickness of each section of the propeller blade is c; the axis coordinate of each section of the propeller blade is (X 0 , Y 0 ), the blade shape and structure dimensions meet the following conditions: When r is 160-170 mm, b is 170-180 mm, c is 50-55 mm, φ is 30-32°, X 0 85~89, Y 0 -0.2~0; When r is 285-290 mm, b is 216-220 mm, c is 30-40 mm, φ is 10-20°, X 0 100~110, Y 0 -2 to -1; When r is 400-500 mm, b is 200-300 mm, c is 20-30 mm, φ is 0-10°, X 0 110~120, Y 0 0 to 1; When r is 500~600mm, b is 200~300mm, c is 20~30mm, φ is -5~+5°, X 0 110~120, Y 0 -1 to 1; When r is 600~700mm, b is 200~300mm, c is 10~20mm, φ is -10~0°, X 0 110~120, Y 0 -1 to 1; When r is 700~800mm, b is 200~300mm, c is 10~20mm, φ is -10~0°, X 0 110~120, Y 0 It is -1 to 1.

2. The ducted propeller for an aerodynamic boat according to claim 1, Features: The blade shape and structure dimensions meet the following conditions: When r is 400-410 mm, b is 220-230 mm, c is 22-25 mm, φ is 3-6°, X 0 110~115, Y 0 0~0.5; When r is 520~540mm, b is 200~250mm, c is 20~25mm, φ is -1~+1°, X 0 113~116, Y 0 -0.5~0.5; When r is 620~650mm, b is 220~240mm, c is 15~17mm, φ is -4~-6°, X 0 113~116, Y 0 -0.1~0; When r is 730~760mm, b is 220~240mm, c is 10~15mm, φ is -10~-6°, X 0 110~120, Y 0 It is -0.2 to -0.

1.

3. The ducted propeller for an aerodynamic boat according to claim 1, Features: The blade shape and structure dimensions are as follows: When r is 165mm, b is 174mm, c is 51mm, φ is 31°, (X 0 , Y 0 ) is (87.7, -0.16); When r is 285mm, b is 216mm, c is 36mm, φ is 18°, (X 0 , Y 0 ) is (109.7, -0.35); When r is 405mm, b is 226.7mm, c is 24.6mm, φ is 5.2°, (X 0 , Y 0 ) is (113, 0.09); When r is 525mm, b is 230mm, c is 20.6mm, φ is 0°, (X 0 , Y 0 ) is (115, 0); When r is 645mm, b is 230mm, c is 16.7mm, φ is -4.5°, (X 0 , Y 0 ) is (115, -0.05); When r is 750mm, b is 230mm, c is 12.5mm, φ is -7°, (X 0 , Y 0 ) is (115, -0.05).

4. The ducted propeller for an aerodynamic boat according to claim 1, Features: The blade shape and structure dimensions are as follows: When r is 170mm, b is 175mm, c is 52mm, φ is 32°, (X 0 , Y 0 ) is (88.7, -0.15); When r is 290mm, b is 220mm, c is 37mm, φ is 19°, (X 0 , Y 0 ) is (110, -0.5); When r is 400 mm, b is 227 mm, c is 24.9 mm, φ is 5.5°, (X 0 , Y 0 ) is (114, 0.10); When r is 530 mm, b is 231 mm, c is 20.5 mm, φ is 0.3°, (X 0 , Y 0 ) is (118, 0.5); When r is 650mm, b is 231mm, c is 16.9mm, φ is -4.8°, (X 0 , Y 0 ) is (115, -0.16); When r is 750mm, b is 231mm, c is 12.8mm, φ is -7.5°, (X 0 , Y 0 ) is (116, -0.15).

5. The ducted propeller for an aerodynamic boat according to claim 1, Features: The ducted propeller blades adopt the ARAD airfoil, which are arranged in order from thick to thin from the blade root to the blade tip, and each section has a smooth transition.

6. The ducted propeller for an aerodynamic boat according to claim 1, Features: The ducted propeller blade has a rectangular shape, the blade tip is an arc, and the arc radius is 740-770mm.

7. The ducted propeller for an aerodynamic boat according to claim 1, Features: The ducted propeller blade material is a composite material.

8. The ducted propeller for an aerodynamic boat according to claim 1, Features: The cross section of the duct in the ducted propeller is a NACA0012 airfoil.

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