CN114633877A - Low-noise propeller - Google Patents
Low-noise propeller Download PDFInfo
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- CN114633877A CN114633877A CN202210147038.6A CN202210147038A CN114633877A CN 114633877 A CN114633877 A CN 114633877A CN 202210147038 A CN202210147038 A CN 202210147038A CN 114633877 A CN114633877 A CN 114633877A
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/16—Blades
- B64C11/20—Constructional features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/16—Blades
- B64C11/18—Aerodynamic features
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of airplane propeller design, and relates to a low-noise propeller. The propeller parameters are as follows: the number of the propeller blades is 3; the diameter of the propeller is 1770-1970 mm; each section of the blade adopts an airfoil ARA-D; when the relative radius is 0.3, the sweepback is 53-59 mm, the chord length is 126-131 mm, and the torsion angle is 17-22 degrees; when the relative radius is 0.6, the sweepback is 43-48 mm, the chord length is 98-103 mm, and the torsion angle is 1-6 degrees; when the relative radius is 0.8, the sweepback is 33-39 mm, the chord length is 76-82 mm, and the torsion angle is-5-0 degrees; when the relative radius is 0.95, the sweepback is 21-26 mm, the chord length is 57-63 mm, and the torsion angle is-9 to-4 degrees; the propeller meets the index requirement that the far-field noise is not more than 66dB under the conditions of 50m/s of maximum flying speed, 5000m of maximum flying height and 83% of cruising efficiency.
Description
Technical Field
The invention belongs to the technical field of airplane propeller design, and relates to a low-noise propeller.
Background
Advanced aviation countries around the world have severe limitations on the noise intensity of aircraft, and for propeller aircraft, about ninety percent of the noise is generated by the propellers. The propeller noise is one of the criteria for measuring the performance of the propeller, and the main source of the noise is the rotation sound of the blades. Propeller noise has many undesirable consequences, mainly in three areas: firstly, in the flying process of the propeller, noise is transmitted to the interior of the cabin through airflow, so that the comfort and experience of passengers in the cabin are influenced; secondly, sound fatigue and structural vibration generated by propeller noise induction have great hidden danger to flight safety; third, noise can affect the environment of the airport area. Therefore, noise reduction is crucial for both aircraft and propellers without changing the aerodynamic performance of the propeller.
The technical indexes are as follows: in the propeller aircraft with the maximum flying speed of 50m/s, the maximum flying height of 5000m and the cruising efficiency of 83 percent, the minimum index of far-field noise in the existing aircraft is 68dB, and the plane shape of a propeller blade is shown in figure 1; in order to further reduce far-field noise, the blades of the propeller need to be re-optimized.
Disclosure of Invention
The purpose of the invention is: a low-noise propeller is designed to meet the condition that far-field noise is not more than 66dB under the conditions of 50m/s of maximum flying speed, 5000m of maximum flying height and 83% of cruising efficiency.
In order to solve the technical problem, the technical scheme of the invention is as follows:
a low noise propeller, the parameters of the low noise propeller are as follows:
the number of the propeller blades is 3; the diameter of the propeller is 1770-1970 mm; each section of the blade adopts an airfoil ARA-D; the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.2, the sweepback is 56-65 mm, the chord length is 135-140 mm, and the torsion angle is 26-31 degrees;
when the relative radius is 0.25, the sweepback is 55-62 mm, the chord length is 130-135 mm, and the torsion angle is 22-27 degrees;
when the relative radius is 0.3, the sweepback is 53-59 mm, the chord length is 126-131 mm, and the torsion angle is 17-22 degrees;
when the relative radius is 0.45, the sweepback is 48-53 mm, the chord length is 112-117 mm, and the torsion angle is 8-13 degrees;
when the relative radius is 0.6, the sweepback is 43-48 mm, the chord length is 98-103 mm, and the torsion angle is 1-6 degrees;
when the relative radius is 0.7, the sweepback is 39-44 mm, the chord length is 88-93 mm, and the torsion angle is-3 degrees;
when the relative radius is 0.8, the sweepback is 33-39 mm, the chord length is 76-82 mm, and the torsion angle is-5-0 degrees;
when the relative radius is 0.9, the sweepback is 26-32 mm, the chord length is 64-69 mm, and the torsion angle is-8 degrees to-3 degrees;
when the relative radius is 0.95, the sweepback is 21-26 mm, the chord length is 57-63 mm, and the torsion angle is-9 to-4 degrees;
when the relative radius is 0.975, the backswept is 18-23 mm, the chord length is 54-59 mm, and the torsion angle is-10 degrees to-5 degrees;
the sweep is the distance from the axis to the leading edge.
Further, the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.2, the sweepback is 58-63 mm, the chord length is 136-139 mm, and the torsion angle is 27-30 degrees;
when the relative radius is 0.3, the sweepback is 54-58 mm, the chord length is 127-130 mm, and the torsion angle is 18-21 degrees;
when the relative radius is 0.6, the sweepback is 44-47 mm, the chord length is 99-102 mm, and the torsion angle is 2-5 degrees;
when the relative radius is 0.7, the sweepback is 40-43 mm, the chord length is 89-92 mm, and the torsion angle is-2 degrees;
when the relative radius is 0.8, the sweepback is 34-38 mm, the chord length is 77-81 mm, and the torsion angle is-4 degrees to-1 degrees;
when the relative radius is 0.9, the sweepback is 27-31 mm, the chord length is 65-68 mm, and the torsion angle is-7 to-4 degrees.
Furthermore, the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.25, the sweepback is 56-61 mm, the chord length is 131-134 mm, and the torsion angle is 23-26 degrees;
when the relative radius is 0.45, the sweepback is 49-52 mm, the chord length is 113-116 mm, and the torsion angle is 9-12 degrees;
when the relative radius is 0.95, the backswept is 22-25 mm, the chord length is 58-62 mm, and the torsion angle is-8 to-4 degrees;
when the relative radius is 0.975, the backswept is 19-22 mm, the chord length is 55-58 mm, and the torsion angle is-9 to-6 degrees.
Further, the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.2, the sweepback is 59-62 mm, the chord length is 137-138 mm, and the torsion angle is 28-29 degrees;
when the relative radius is 0.3, the sweepback is 55-57 mm, the chord length is 128-129 mm, and the torsion angle is 19-20 degrees;
when the relative radius is 0.6, the sweepback is 45-46 mm, the chord length is 100-101 mm, and the torsion angle is 3-4 degrees;
when the relative radius is 0.7, the sweepback is 41-42 mm, the chord length is 90-91 mm, and the torsion angle is-1 degrees;
when the relative radius is 0.8, the sweepback is 35-37 mm, the chord length is 78-80 mm, and the torsion angle is-3 degrees to-2 degrees;
when the relative radius is 0.9, the sweepback is 28-30 mm, the chord length is 66-67 mm, and the torsion angle is-6 to-5 degrees.
Further, the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.25, the sweepback is 58-60 mm, the chord length is 132-133 mm, and the torsion angle is 24-25 degrees;
when the relative radius is 0.45, the sweepback is 50-51 mm, the chord length is 114-115 mm, and the torsion angle is 10-11 degrees;
when the relative radius is 0.95, the sweepback is 23-24 mm, the chord length is 59-61 mm, and the torsion angle is-7 to-6 degrees;
when the relative radius is 0.975, the sweepback is 20-21 mm, the chord length is 56-57 mm, and the torsion angle is-8 to-7 degrees.
Preferably, the chord length, the torsion angle and the sweepback value of each tangent plane at different relative radiuses meet the following conditions:
when the relative radius is 0.2, the sweepback is 61.77mm, the chord length is 137.45mm, and the torsion angle is 28.95 degrees;
when the relative radius is 0.3, the sweepback is 56.36mm, the chord length is 128.11mm, and the torsion angle is 19.96 degrees;
when the relative radius is 0.6, the sweepback is 45.70mm, the chord length is 100.26mm, and the torsion angle is 3.29 degrees;
when the relative radius is 0.8, the sweep is 36.12mm, the chord length is 78.99mm, and the torsion angle is-2.72 degrees.
When the relative radius is 0.25, the sweepback is 58.84mm, the chord length is 132.74mm, and the torsion angle is 24.19 degrees;
when the relative radius is 0.45, the sweepback is 50.65mm, the chord length is 114.42mm, and the torsion angle is 10.02 degrees;
when the relative radius is 0.7, the sweepback is 41.63mm, the chord length is 90.09mm, and the torsion angle is 0.00 degree;
when the relative radius is 0.9, the backswept is 28.44mm, the chord length is 66.68mm, and the torsion angle is-5.23 degrees.
When the relative radius is 0.95, the sweepback is 23.56mm, the chord length is 59.98mm, and the torsion angle is-6.52 degrees;
when the relative radius is 0.975, the sweep is 20.83mm, the chord length is 56.49mm, and the torsion angle is-7.19 degrees.
The invention has the beneficial effects that: the aerodynamic performance and noise level of a propeller are determined by the aerodynamic profile of the blades, and noise reduction necessitates changes to the aerodynamic profile, which typically reduces the aerodynamic performance of the propeller. Therefore, the noise reduction of the propeller by 1-2 dB is difficult. The invention reduces the noise by 2dB and 3% on the premise of keeping the aerodynamic performance of the propeller not reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment of the present invention will be briefly explained. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can also be derived from them without inventive effort.
FIG. 1 is a schematic view of a prior art propeller blade planform;
FIG. 2 is a schematic view of a propeller blade planform of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.
The number of the propeller blades is 3; propeller diameter 1850mm, 1860mm, 1870mm, 1880mm, 1890 mm; each section of the blade adopts an airfoil ARA-D; optimized to obtain the following shapes of a plurality of paddles,
the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
TABLE 1
| Relative radius | Sweepback (distance from axis to front edge) | Chord length | Torsional angle |
| 0.2 | 61.77 | 137.45 | 28.95 |
| 0.25 | 58.84 | 132.74 | 24.19 |
| 0.3 | 56.36 | 128.11 | 19.96 |
| 0.45 | 50.65 | 114.42 | 10.02 |
| 0.6 | 45.70 | 100.26 | 3.29 |
| 0.7 | 41.63 | 90.09 | 0.00 |
| 0.8 | 36.12 | 78.99 | -2.72 |
| 0.9 | 28.44 | 66.68 | -5.23 |
| 0.95 | 23.56 | 59.98 | -6.52 |
| 0.975 | 20.83 | 56.49 | -7.19 |
TABLE 2
TABLE 3
| Relative radius | Sweepback (distance from axis to front edge) | Chord length | Torsional angle |
| 0.2 | 62 | 138 | 29 |
| 0.25 | 59 | 133 | 25 |
| 0.3 | 57 | 129 | 20 |
| 0.45 | 51 | 115 | 11 |
| 0.6 | 46 | 101 | 4 |
| 0.7 | 42 | 91 | 1 |
| 0.8 | 37 | 79 | -3 |
| 0.9 | 29 | 67 | -6 |
| 0.95 | 24 | 60 | -7 |
| 0.975 | 21 | 57 | -8 |
TABLE 4
| Relative radius | Sweepback (distance from axis to front edge) | Chord length | Torsional angle |
| 0.2 | 61.5 | 137.4 | 28.9 |
| 0.25 | 58.8 | 132.7 | 24.1 |
| 0.3 | 56.3 | 128.1 | 19.9 |
| 0.45 | 50.6 | 114.4 | 10.0 |
| 0.6 | 45.7 | 100.2 | 3.2 |
| 0.7 | 41.6 | 90.0 | 0.00 |
| 0.8 | 36.1 | 78.9 | -2.7 |
| 0.9 | 28.4 | 66.6 | -5.2 |
| 0.95 | 23.5 | 59.9 | -6.5 |
| 0.975 | 20.8 | 56.4 | -7.1 |
TABLE 5
| Relative radius | Sweepback (distance from axis to front edge) | Chord length | Torsional angle |
| 0.2 | 61 | 138.4 | 28.1 |
| 0.25 | 59 | 133.7 | 24.2 |
| 0.3 | 56 | 129.1 | 18.9 |
| 0.45 | 51 | 115.4 | 11.0 |
| 0.6 | 45 | 101.2 | 4.2 |
| 0.7 | 42 | 91.0 | 1.00 |
| 0.8 | 36 | 79.9 | -3.7 |
| 0.9 | 29 | 67.6 | -6.2 |
| 0.95 | 24.5 | 60.9 | -7.5 |
| 0.975 | 21.8 | 57.4 | -8.1 |
TABLE 6
| Relative radius | Sweepback (distance from axis to front edge) | Chord length | Torsional angle |
| 0.2 | 61.1 | 137.1 | 28.2 |
| 0.25 | 58.2 | 132.3 | 24.2 |
| 0.3 | 56.1 | 128.8 | 19.3 |
| 0.45 | 50.4 | 114.6 | 10.2 |
| 0.6 | 45.1 | 100.1 | 3.3 |
| 0.7 | 41.3 | 90.3 | 0.2 |
| 0.8 | 36.5 | 78.9 | -2.3 |
| 0.9 | 28.7 | 66.1 | -5.3 |
| 0.95 | 23.9 | 59.2 | -6.4 |
| 0.975 | 20.1 | 56.1 | -7.5 |
TABLE 7
| Relative radius | Sweepback (distance from axis to front edge) | Chord length | Torsional angle |
| 0.2 | 61.9 | 138.1 | 27.2 |
| 0.25 | 58.7 | 133.3 | 25.1 |
| 0.3 | 55.7 | 129.2 | 18.8 |
| 0.45 | 48.6 | 115.4 | 11.1 |
| 0.6 | 43.7 | 101.1 | 2.1 |
| 0.7 | 43.6 | 91.1 | 0.2 |
| 0.8 | 37.1 | 79.2 | -3.3 |
| 0.9 | 26.4 | 67.6 | -4.9 |
| 0.95 | 25.5 | 58.2 | -5.6 |
| 0.975 | 21.8 | 55.3 | -6.8 |
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (8)
1. A low noise propeller characterized by: the parameters of the low-noise propeller are as follows:
the number of the propeller blades is 3; the diameter of the propeller is 1770-1970 mm; each section of the blade adopts an airfoil ARA-D; the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.2, the sweepback is 56-65 mm, the chord length is 135-140 mm, and the torsion angle is 26-31 degrees;
when the relative radius is 0.25, the sweepback is 55-62 mm, the chord length is 130-135 mm, and the torsion angle is 22-27 degrees;
when the relative radius is 0.3, the sweepback is 53-59 mm, the chord length is 126-131 mm, and the torsion angle is 17-22 degrees;
when the relative radius is 0.45, the sweepback is 48-53 mm, the chord length is 112-117 mm, and the torsion angle is 8-13 degrees;
when the relative radius is 0.6, the sweepback is 43-48 mm, the chord length is 98-103 mm, and the torsion angle is 1-6 degrees;
when the relative radius is 0.7, the sweepback is 39-44 mm, the chord length is 88-93 mm, and the torsion angle is-3 degrees;
when the relative radius is 0.8, the sweepback is 33-39 mm, the chord length is 76-82 mm, and the torsion angle is-5-0 degrees;
when the relative radius is 0.9, the backswept is 26-32 mm, the chord length is 64-69 mm, and the torsion angle is-8 to-3 degrees;
when the relative radius is 0.95, the sweepback is 21-26 mm, the chord length is 57-63 mm, and the torsion angle is-9 to-4 degrees;
when the relative radius is 0.975, the backswept is 18-23 mm, the chord length is 54-59 mm, and the torsion angle is-10 degrees to-5 degrees;
the sweep is the distance from the axis to the leading edge.
2. The low noise propeller of claim 1, wherein: the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.2, the sweepback is 58-63 mm, the chord length is 136-139 mm, and the torsion angle is 27-30 degrees;
when the relative radius is 0.3, the sweepback is 54-58 mm, the chord length is 127-130 mm, and the torsion angle is 18-21 degrees;
when the relative radius is 0.6, the sweepback is 44-47 mm, the chord length is 99-102 mm, and the torsion angle is 2-5 degrees;
when the relative radius is 0.7, the sweepback is 40-43 mm, the chord length is 89-92 mm, and the torsion angle is-2 degrees;
when the relative radius is 0.8, the backswept is 34-38 mm, the chord length is 77-81 mm, and the torsion angle is-4 to-1 degrees;
when the relative radius is 0.9, the sweepback is 27-31 mm, the chord length is 65-68 mm, and the torsion angle is-7 to-4 degrees.
3. The low noise propeller of claim 1, wherein: the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.25, the sweepback is 56-61 mm, the chord length is 131-134 mm, and the torsion angle is 23-26 degrees;
when the relative radius is 0.45, the sweepback is 49-52 mm, the chord length is 113-116 mm, and the torsion angle is 9-12 degrees;
when the relative radius is 0.95, the backswept is 22-25 mm, the chord length is 58-62 mm, and the torsion angle is-8 to-4 degrees;
when the relative radius is 0.975, the sweepback is 19-22 mm, the chord length is 55-58 mm, and the torsion angle is-9 to-6 degrees.
4. The low noise propeller of claim 1, wherein: the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.2, the sweepback is 59-62 mm, the chord length is 137-138 mm, and the torsion angle is 28-29 degrees;
when the relative radius is 0.3, the sweepback is 55-57 mm, the chord length is 128-129 mm, and the torsion angle is 19-20 degrees;
when the relative radius is 0.6, the sweepback is 45-46 mm, the chord length is 100-101 mm, and the torsion angle is 3-4 degrees;
when the relative radius is 0.7, the sweepback is 41-42 mm, the chord length is 90-91 mm, and the torsion angle is-1 degree;
when the relative radius is 0.8, the backswept is 35-37 mm, the chord length is 78-80 mm, and the torsion angle is-3 degrees to-2 degrees;
when the relative radius is 0.9, the sweepback is 28-30 mm, the chord length is 66-67 mm, and the torsion angle is-6 to-5 degrees.
5. The low noise propeller of claim 1, wherein: the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.25, the sweepback is 58-60 mm, the chord length is 132-133 mm, and the torsion angle is 24-25 degrees;
when the relative radius is 0.45, the sweepback is 50-51 mm, the chord length is 114-115 mm, and the torsion angle is 10-11 degrees;
when the relative radius is 0.95, the sweepback is 23-24 mm, the chord length is 59-61 mm, and the torsion angle is-7 degrees to-6 degrees;
when the relative radius is 0.975, the sweepback is 20-21 mm, the chord length is 56-57 mm, and the torsion angle is-8 to-7 degrees.
6. The low noise propeller of claim 1, wherein: the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.2, the sweepback is 61.77mm, the chord length is 137.45mm, and the torsion angle is 28.95 degrees;
when the relative radius is 0.3, the sweepback is 56.36mm, the chord length is 128.11mm, and the torsion angle is 19.96 degrees;
when the relative radius is 0.6, the sweepback is 45.70mm, the chord length is 100.26mm, and the torsion angle is 3.29 degrees;
when the relative radius is 0.8, the sweep is 36.12mm, the chord length is 78.99mm, and the torsion angle is-2.72 degrees.
7. The low noise propeller of claim 6, wherein: the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.25, the sweepback is 58.84mm, the chord length is 132.74mm, and the torsion angle is 24.19 degrees;
when the relative radius is 0.45, the sweepback is 50.65mm, the chord length is 114.42mm, and the torsion angle is 10.02 degrees;
when the relative radius is 0.7, the sweepback is 41.63mm, the chord length is 90.09mm, and the torsion angle is 0.00 degree;
when the relative radius is 0.9, the sweepback is 28.44mm, the chord length is 66.68mm, and the torsion angle is-5.23 degrees.
8. The low noise propeller of claim 7, wherein: the chord length, the torsion angle and the sweepback value of each tangent plane under different relative radiuses meet the following conditions:
when the relative radius is 0.95, the sweepback is 23.56mm, the chord length is 59.98mm, and the torsion angle is-6.52 degrees;
when the relative radius is 0.975, the sweep is 20.83mm, the chord length is 56.49mm, and the torsion angle is-7.19 degrees.
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| US20210253236A1 (en) * | 2018-12-07 | 2021-08-19 | Joby Aero, Inc. | Rotary airfoil and design therefore |
| CN109774962A (en) * | 2019-01-21 | 2019-05-21 | 西北工业大学 | A kind of Exterior Surface Design of low noise propeller |
| CN112173077A (en) * | 2020-09-25 | 2021-01-05 | 中国直升机设计研究所 | Big front-back sweeping combined helicopter rotor blade |
| CN113022849A (en) * | 2021-05-28 | 2021-06-25 | 北京三快在线科技有限公司 | Propeller and rotor craft |
| CN216916266U (en) * | 2022-02-17 | 2022-07-08 | 惠阳航空螺旋桨有限责任公司 | Low-noise propeller |
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