Rotor blade suitable for multiple working conditions and construction method thereof

Abstract

The invention relates to the technical field of rotor blades, in particular to a rotor blade suitable for multiple working conditions and a construction method thereof, and the construction method comprises the following steps: selecting a mean camber line and a coaxial line, constructing a plane (M, R * theta) on the basis of a reference length, and defining the mean camber line by using a simple Bezier curve; constructing a flow surface; and outputting a design result, selecting a mean camber line taking a reference length as a benchmark and a coaxial structure surface as (M, R * theta) during use, defining the mean camber line by utilizing a simple Bezier curve, inputting a radial value of the blade and a design parameter to construct a flow surface, and generating a rotor blade model by software to obtain the design result. The improved blade can better meet the working requirements under multiple working conditions, the working performance is good, the flow range of normal working of the blade can be increased, and larger passing flow can be obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of rotor blades, and in particular to a rotor blade adaptable to multiple working conditions and a construction method thereof. Background Art

[0002] At present, in the design and application of compressors, the performance of rotor blades is crucial to the efficiency and stability of the overall equipment. In recent years, with the introduction of advanced technologies such as computational fluid dynamics (CFD), optimization algorithms, and artificial intelligence (AI), the design process of turbomachinery has changed significantly. However, the application of these technologies is mostly focused on the design of a single operating point, and the resulting rotor blades only perform well under specific operating conditions, resulting in poor performance under variable operating conditions. In actual applications, compressors are under a variety of conditions such as load fluctuations and airflow changes, which puts high demands on the variable operating performance of rotor blades. Therefore, it is particularly critical to develop compressor rotor blades that are adaptable to multi-operating conditions and have excellent performance.

[0003] The existing rotor blades have strong performance indicators in a single working condition, but are prone to performance degradation when applied to other working conditions. In addition, flow separation and vortex generation in complex flow fields will greatly affect the aerodynamic characteristics of the blades. Therefore, based on the above problems, it has become an urgent need to obtain rotor blades that can perform well under multiple working conditions. Summary of the invention

[0004] The purpose of the present invention is to provide a rotor blade that can adapt to multiple working conditions and a construction method thereof, aiming to solve the technical problems in the prior art that the performance indicators of rotor blades in a single working condition are strong, and performance is easily degraded when applied to other working conditions, and the flow separation and generation of vortices in complex flow fields will greatly affect the aerodynamic characteristics of the blades.

[0005] To achieve the above-mentioned purpose, the present invention adopts a method for constructing a rotor blade adapted to multiple working conditions, comprising the following steps:

[0006] Select the median arc and coaxial line, construct the surface (M, R*θ) based on the reference length, and use a simple Bezier curve to define the median arc;

[0007] Construct flow surface;

[0008] Output the design results.

[0009] The radial distribution of the blade is divided into three flow surfaces: [0, 0.48, 1];

[0010] The three flow surfaces are stacked into blades by using blade centroid stacking method;

[0011] The sweep characteristic of the stacked line is represented by five control points, and the bend characteristic is represented by five control points.

[0012] Among them, three control points are defined on the suction surface of each stream surface blade profile, and two control points are defined on the pressure surface;

[0013] The stretch factor is set to 1.2.

[0014] The blade is designed using the AutoBlade module in the NUMECA software.

[0015] The present invention also provides a rotor blade adapted to multiple working conditions, which is constructed using the method for constructing a rotor blade adapted to multiple working conditions.

[0016] The present invention discloses a rotor blade that is adaptable to multiple working conditions and a construction method thereof. When used, a mid-arc line and a coaxial line based on a reference length are selected, and a construction surface is (M, R*θ). A simple Bezier curve is used to define the mid-arc line, and a blade radial value and design parameters are input to construct a flow surface. The software generates a rotor blade model to obtain a design result. By designing the blade in this way, the improved blade can better adapt to the requirements of working under multiple working conditions, has good working performance, can increase the flow range of normal working of the blade, and obtain a larger flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

[0018] Figure 1 It is a flow chart of the method for constructing rotor blades adaptable to multiple working conditions of the present invention.

[0019] Figure 2 It is a front view of the rotor blade adapted to multiple working conditions of the present invention.

[0020] Figure 3 It is a rear view of the rotor blade adapted to multiple working conditions of the present invention.

[0021] Figure 4 It is a left side view of the rotor blade adapted to multiple working conditions of the present invention.

[0022] Figure 5 It is a curve comparison diagram of the working flow-efficiency characteristics of the rotor blades adapted to multiple working conditions of the present invention. DETAILED DESCRIPTION

[0023] See also Figure 1 The present invention provides a method for constructing a rotor blade that is adaptable to multiple working conditions, comprising the following steps:

[0024] S1: Select the mid-arc and coaxial;

[0025] In this embodiment, the surface (M, R*θ) is constructed based on the reference length and a simple Bezier curve is used to define the median arc line;

[0026] S2: build flow surface;

[0027] In this embodiment, a blade profile of a flow surface is constructed, a mid-arc line and a coaxial line based on a reference length are selected, the construction surface is (M, R*θ), and a simple Bezier curve is used to define the mid-arc line; the radial distribution of the blade is divided into three flow surfaces [0, 0.48, 1], and the three flow surfaces are stacked into a blade using a blade profile centroid stacking method; five control points are used to represent the "swept" characteristic of the stacked line, and five control points are used to represent the "bend" characteristic; three control points are defined on the suction surface of each flow surface blade profile, and two control points are defined on the pressure surface, and the stretch factor is set to 1.2.

[0028] S3: Output design results;

[0029] In this embodiment, the blade is designed using the AutoBlade module in NUMECA software.

[0030] The present invention divides the radial distribution of the blade into three flow surfaces [0, 0.48, 1], and stacks the three flow surfaces into a blade by using a blade centroid stacking method. The "sweep" characteristic of the stacking line is represented by five control points, and the "bend" characteristic is represented by five control points. In order to construct the blade of the three flow surfaces, a mid-arc line and a coaxial line based on a reference length need to be selected, and the construction surface is (M, R*θ). A simple Bezier curve is used to define the mid-arc line, three control points are defined on the suction surface of each flow surface blade, and two control points are defined on the pressure surface. The stretching factor is set to 1.2, and the blade is designed by the AutoBlade module in the NUMECA software. The improved blade can better adapt to the needs of working under multiple working conditions, has good working performance, can increase the flow range of the blade in normal operation, and obtain a larger flow rate.

[0031] Using Table 1, where Table 1 shows the specific data of the blades improved by using AutoBlade, the shape of the rotor blades with multi-condition adaptability can be constructed in the AutoBlade module in the NUMECA software.

[0032]

[0033]

[0034]

[0035] Table 1

[0036] See also Figure 2 to Figure 4 The present invention provides a rotor blade that adapts to multiple working conditions, which is constructed using the rotor blade construction method that adapts to multiple working conditions.

[0037] Please refer to Figure 5 Flow-efficiency characteristic curve comparison chart;

[0038] Compared with ordinary blades, the advantages of this blade are as follows:

[0039] 1. Good performance under multiple working conditions. The blades obtained by traditional single working condition optimization design have improved working efficiency only under a certain working condition. The improved blades can better adapt to the needs of working under multiple working conditions and have good working performance.

[0040] 2. Increased working flow range: Compared with traditional blades, the improved blades are more adaptable to working under small flow conditions (18.7kg / s), so the flow range in which they can work normally is increased.

[0041] 3. Increased flow at the clogging point: The clogging flow of ordinary blades is 21kg / s, and the clogging flow of the improved blades is 21.215kg / s, which is an increase of 1.023%, and a larger flow rate can pass through.

[0042] In summary, the efficiency of the improved rotor blades has been improved under the entire working condition, and the flow rate at the blockage point has increased, which means that more flow can be handled under the same pressure conditions. Before the blockage point, the efficiency improvement after optimization is small, but after the blockage point, the efficiency after optimization is significantly higher than before optimization, and the range of working flow is increased, which is also applicable under small flow conditions.

[0043] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for constructing a rotor blade adapted to multiple working conditions, characterized in that: The steps include: Select the median arc and coaxial line, construct the surface (M, R*θ) based on the reference length, and use a simple Bezier curve to define the median arc; Construct flow surface; Output the design results.

2. The method for constructing a rotor blade adapted to multiple working conditions according to claim 1, characterized in that: In the step of building the stream surface: The radial distribution of the blade is divided into three flow surfaces [0, 0.48, 1]; The three flow surfaces are stacked into blades by using blade centroid stacking method; The sweep characteristic of the stacked line is represented by five control points, and the bend characteristic is represented by five control points.

3. The method for constructing a rotor blade adapted to multiple working conditions according to claim 2, characterized in that: In the step of building the stream surface: Three control points are defined on the suction surface of each stream blade profile, and two control points are defined on the pressure surface; The stretch factor is set to 1.

2.

4. The method for constructing a rotor blade adapted to multiple working conditions according to claim 1, characterized in that: In the step of outputting design results: The blade was designed using the AutoBlade module in NUMECA software.

5. A rotor blade adapted to multiple working conditions, characterized in that: The rotor blade is constructed by using the method for constructing a rotor blade adapted to multiple working conditions as described in any one of claims 1 to 4.

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