Method for adjusting uniformity of internal flow field of gas compressor

Abstract

The invention provides a method for adjusting the uniformity of a flow field in a gas compressor, which is characterized in that under the influence of the installation angle of a whole-stage blade on the non-uniformity of the flow field, a calculation method of influence coefficients is provided: the installation angles of the blades are measured one by one according to the installation sequence of the blades to form installation angle data; and when the influence coefficient standard is not met, the whole-stage blade needs to be reassembled, and the blade mounting angular positions are rearranged according to the blade mounting angles, so that the influence coefficient is reduced. A programming mode is used, the influence coefficient is reduced as a target, and the installation angles of the blades are optimally arranged. The method for adjusting the uniformity of the internal flow field of the gas compressor has the advantages that by adjusting the mounting positions of the stator blades and improving the distribution of the mounting angles of the blades, the influence of the mounting angles of the blades on the uniformity of the flow field can be effectively reduced, the problem that the stability margin of the gas compressor is insufficient is solved, and the reliability of an engine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengines, and in particular to a method for adjusting uniformity of flow field inside a compressor. Background Art

[0002] The stator blades of aircraft engine compressors are mainly used to change the angle of air flow in the components so that the air flow direction can meet the downstream requirements. The ability of the compressor stator blades to change the air flow angle is mainly determined by its installation angle. When there is a large deviation in the installation angle of the entire stage blades, the uniformity of the internal flow field is destroyed, thereby reducing the stable working margin of the compressor. Therefore, during the engine manufacturing and assembly process, the installation angle of the entire stage blades needs to be strictly controlled. In actual manufacturing, relying on design experience and reliability analysis results, the upper and lower tolerances of the blade installation angle are given to control the installation angle of the entire stage blades within the tolerance range, but there is a lack of methods to adjust the uniformity of the internal flow field of the compressor. Summary of the invention

[0003] The purpose of the present invention is to improve the uniformity of the flow field inside a compressor by adjusting the distribution of the installation angles of stator blades, and a method for adjusting the uniformity of the flow field inside a compressor is particularly provided.

[0004] The present invention provides a method for adjusting the uniformity of the internal flow field of a compressor, which is characterized in that: during the manufacturing and assembly process of the engine, the installation angle of the entire blade stage needs to be measured, and by judging whether the installation angle θ meets the upper and lower tolerances of the blade installation angle, it is determined whether the blade needs to be replaced or reassembled. When the installation angle meets the tolerance range, the blade installation position will not be adjusted.

[0005] For the stator blades of a compressor stage, there are 30 to 110 stator blades. The installation angle of each stator blade is different. When the installation angles of two blades differ greatly, the airflow channel in the middle will have greater specificity, resulting in greater non-uniformity of the flow field inside the compressor at this position.

[0006] In view of the influence of the installation angle of the whole-stage blades on the flow field non-uniformity, a calculation method for the influence coefficient is proposed:

[0007] The blade installation angles are measured one by one according to the blade installation sequence to form installation angle data.

[0008] The influence coefficient R is calculated according to the following formula:

[0009]

[0010] where θ i (i=1,2...N) is the installation angle of the i-th blade, N is the number of blades in the whole stage, ES is the upper tolerance of the blade installation angle, and EI is the lower tolerance of the blade installation angle. When calculating, θN+1 =θ1.

[0011] The influence coefficient R should satisfy R≤0.3. Set reasonable influence coefficient standards based on the actual structure of the product and engineering experience.

[0012] When the influence coefficient standard is not met, the entire stage of blades needs to be reassembled and the blade installation angular positions need to be rearranged according to the blade installation angle to reduce the influence coefficient.

[0013] Using programming, the blade installation angle is optimized with the goal of reducing the influence coefficient. The following optimization arrangement methods are used:

[0014] The blades are arranged one by one in a clockwise direction from large to small according to the blade installation angle.

[0015] The blades are divided into three groups according to their installation angle values ​​from large to small, and each group is arranged one by one in a clockwise direction.

[0016] The blades are divided into four groups according to their installation angle values ​​from large to small, and each group is arranged one by one in a clockwise direction.

[0017] This application scheme formulates a calculation method for the influence coefficient of the stator blade installation angle distribution on the uniformity of the internal flow field of the compressor, and evaluates the uniformity of the internal flow field by calculating the uniformity influence coefficient. A method for adjusting the stator blade installation angle distribution is proposed.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The method for adjusting the uniformity of the internal flow field of a compressor described in the present invention can effectively reduce the influence of the blade installation angle on the uniformity of the flow field by adjusting the installation position of the stator blades and improving the distribution of the blade installation angles, thereby solving the problem of insufficient stability margin of the compressor and improving the reliability of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 Schematic diagram of blade installation angle measurement;

[0022] Figure 2 Schematic diagram of the installation angle of the whole-stage blades;

[0023] Figure 3 Schematic diagram of common blade installation angle arrangement;

[0024] Figure 1 In the figure, A is the leading edge of the blade, B is the trailing edge of the blade, C is the measuring head, S is the blade to be measured, and θ is the installation angle of the blade. DETAILED DESCRIPTION

[0025] The present invention will be further explained below in conjunction with specific implementation plans, but the present invention is not limited thereto. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0026] During the engine manufacturing and assembly process, it is necessary to measure the installation angle of the entire blade stage. The main angle measurement principle is shown in Figure 1 By judging whether the installation angle θ meets the upper and lower tolerances of the blade installation angle, it is determined whether the blade needs to be replaced or reassembled. When the installation angle meets the tolerance range, the blade installation position will not be adjusted.

[0027] For the compressor stator blades of the whole stage, there are 30 to 110 stator blades. The installation angle of each stator blade is different. Figure 2 When the installation angles of the two blades differ greatly, the middle airflow channel will have greater specificity, resulting in greater non-uniformity of the flow field inside the compressor at this position.

[0028] Considering the influence of the installation angle of the whole-stage blades on the flow field non-uniformity, a calculation method for the influence coefficient is proposed:

[0029] The blade installation angles are measured one by one according to the blade installation sequence to form installation angle data.

[0030] The influence coefficient R is calculated according to the following formula:

[0031]

[0032] where θ i (i=1,2...N) is the installation angle of the i-th blade, N is the number of blades in the whole stage, ES is the upper tolerance of the blade installation angle, and EI is the lower tolerance of the blade installation angle. When calculating, θ N+1 =θ1.

[0033] The influence coefficient R should satisfy R≤0.3. Set reasonable influence coefficient standards based on the actual structure of the product and engineering experience.

[0034] When the influence coefficient standard is not met, the entire stage of blades needs to be reassembled and the blade installation angular positions need to be rearranged according to the blade installation angle to reduce the influence coefficient.

[0035] Use programming to optimize the blade installation angle with the goal of reducing the influence coefficient. There are the following optimization arrangements, see Figure 3 :

[0036] The blades are arranged one by one in a clockwise direction from large to small according to the blade installation angle.

[0037] The blades are divided into three groups according to their installation angle values ​​from large to small, and each group is arranged one by one in a clockwise direction.

[0038] The blades are divided into four groups according to their installation angle values ​​from large to small, and each group is arranged one by one in a clockwise direction.

[0039] Matters not covered by the present invention are known technologies.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for adjusting uniformity of flow field inside a compressor, characterized in that: The stator blades of the compressor stage include 30 to 110 stator blades, and the installation angle of each stator blade is different. When the installation angles of two blades differ greatly, the air flow channel in the middle will have greater specificity, resulting in greater non-uniformity of the flow field inside the compressor at this position. In view of the influence of the installation angle of the whole-stage blades on the flow field non-uniformity, a calculation method for the influence coefficient is proposed: Measure the installation angles of the blades one by one according to the installation sequence of the blades to form installation angle data; The influence coefficient R is calculated according to the following formula: where θ i (i=1,2...N) is the installation angle of the i-th blade, N is the number of blades in the whole stage, ES is the upper tolerance of the blade installation angle, and EI is the lower tolerance of the blade installation angle; when calculating, θ N+1 =θ1; The influence coefficient R should satisfy R≤0.3; set a reasonable influence coefficient standard based on the actual structure of the product and engineering experience; When the influence coefficient standard is not met, the entire stage of blades needs to be reassembled and the blade installation angular positions need to be rearranged according to the blade installation angle to reduce the influence coefficient.

2. The method for adjusting the uniformity of the internal flow field of a compressor according to claim 1, characterized in that: Using programming, the blade installation angle is optimized with the goal of reducing the influence coefficient; the following optimization arrangement method is used: Arrange the blades one by one in a clockwise direction from large to small according to the blade installation angle values; The blades are divided into three groups according to their installation angle values ​​from large to small, and each group is arranged one by one in a clockwise direction; The blades are divided into four groups according to their installation angle values ​​from large to small, and each group is arranged one by one in a clockwise direction.

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