A method for controlling the throat area of ​​a vane diffuser

Abstract

The present invention relates to a method for controlling the throat area of a vane diffuser. The method for controlling the throat area of the vane diffuser includes the following steps: obtaining diffuser data; defining the throat area M in a single piece based on the diffuser data d ; obtaining the measured average throat diameter at the inlet #imgabs0#; calculating the required average channel height at the inlet based on the throat area M in the single piece d and the measured average throat diameter at the inlet #imgabs1#; performing brazing based on the required average channel height at the inlet #imgabs2# to achieve the purpose of controlling the total throat area M. By defining the throat area value of the diffuser in a single piece and adjusting the required average channel height at the inlet through the measured average throat diameter at the inlet #imgabs4#, the present invention can effectively ensure that the throat area of the diffuser in the component meets the requirements without increasing the relevant dimensional tolerance accuracy, can effectively avoid the risk of reworking the inlet blade tip due to unqualified throat area, and improves the processing economy

Description

Technical Field

[0001] The invention belongs to the technical field of aeroengines, and in particular relates to a method for controlling the throat area of ​​a blade-type diffuser. Background Art

[0002] The throat area of ​​the diffuser is an important parameter that affects the performance and margin of the aircraft engine compressor. The current diffuser throat area control method cannot ensure that the diffuser throat area does not exceed the tolerance. The diffuser throat area M is mainly determined by the average diffuser inlet throat diameter. Average channel height at diffuser inlet The number of blade channels N determines the The tolerance range of machining is large and brazing The tolerance is further increased. If the component is qualified, the throat area M will still exceed the tolerance after the component brazing is completed. In order to ensure the diffuser throat area, the only options are:

[0003] 1) Place the single piece Tightening tolerances will affect the qualification rate and efficiency of parts processing, and thus affect economic efficiency;

[0004] 2) When the throat area is too small, repair the diffuser blade inlet (such as Figure 2 As shown in the figure, the diffuser blade profile is out of tolerance, which in turn affects the compressor performance and margin and even affects the structural strength and life of the diffuser.

[0005] Therefore, it is necessary to provide a new blade diffuser throat area control method to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a method for controlling the throat area of ​​a blade-type diffuser in order to solve the above-mentioned problem.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0008] A method for controlling the throat area of ​​a blade diffuser comprises the following steps:

[0009] Acquire diffuser data, the diffuser data including the average inlet throat diameter Average inlet channel height Number of blade passages N, total throat area M and brazing error Δ 钎焊 ;

[0010] Based on the diffuser data, the throat area M of a single piece is defined d ;

[0011] Get the measured average inlet throat diameter Based on the throat area M of the single piece d and the measured average inlet throat diameter Calculate the required average inlet channel height

[0012] Average inlet channel height based on the requirements Brazing is performed to achieve the purpose of controlling the total throat area M.

[0013] As a further optimization solution of the present invention, the average inlet throat diameter The average inlet channel height The total throat area M, the brazing error Δ 钎焊 , the throat area M of the single piece d and the required average inlet channel height All are range values, recorded as the average inlet throat diameter Average inlet channel height Total throat area M(M min , M max ), brazing error Δ 钎焊 (0,

[0014] Δ 钎焊 ), throat area of ​​a single piece M d (M dmin , M dmax ), required average inlet channel height in, Indicates the minimum value of the average inlet throat diameter, Indicates the maximum value of the average inlet throat diameter; Indicates the minimum value of the average inlet channel height, Indicates the maximum value of the average inlet channel height; M min Indicates the minimum total throat area, M max Indicates the maximum total throat area; M dmin Indicates the minimum throat area in a single piece, M dmax It indicates the maximum throat area in a single piece; Indicates the minimum required average inlet channel height, Indicates the maximum required average inlet channel height.

[0015] As a further optimization solution of the present invention, the total throat area M is obtained by the average inlet throat diameter Average inlet channel height Brazing error Δ 钎焊 And the number of blade channels N is calculated, the formula is as follows:

[0016]

[0017] As a further optimization solution of the present invention, the throat area M of a single piece is limited based on the diffuser data. d The formula is as follows:

[0018]

[0019] As a further optimization scheme of the present invention, based on the throat area M in the single piece d and the measured average inlet throat diameter Calculate the required average inlet channel height The formula is as follows:

[0020]

[0021] M dmin and M dmax Substituting this gives:

[0022]

[0023] As a further optimization scheme of the present invention, the average inlet channel height is increased by grinding the blade tip. Maintain the required average inlet channel height is within the value range of .

[0024] As a further optimization solution of the present invention, the diffuser data includes the average inlet throat diameter The value is The average inlet channel height The value is The number of blade passages N is 17, and the total throat area M (M min , M max ) is M(1980mm 2 , 2040mm 2 ), the brazing error Δ 钎焊 The value is 0-0.1mm.

[0025] The beneficial effects of the present invention are:

[0026] The present invention limits the throat area of ​​the diffuser in a single piece and measures the average throat diameter of the inlet. To adjust the required average inlet channel height Without increasing the relevant dimensional tolerance accuracy, it can effectively ensure that the diffuser throat area in the component meets the requirements, and can effectively avoid the risks brought by repairing the inlet blade tip due to unqualified throat area. It has the advantages of high processing qualification rate and high processing efficiency, thereby significantly improving the processing economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow chart of the method of the present invention;

[0028] Figure 2 It is a schematic diagram of diffuser inlet polishing and repair in the prior art;

[0029] Figure 3 It is a schematic diagram of the throat requirements of the diffuser in a single piece in the present invention;

[0030] Figure 4 It is a schematic diagram of the diffuser throat requirements in the assembly of the present invention. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0032] like Figure 1 As shown, a method for controlling the throat area of ​​a blade-type diffuser comprises the following steps:

[0033] S1: Acquire diffuser data, the diffuser data including the average inlet throat diameter Average inlet channel height Number of blade passages N, total throat area M and brazing error Δ 钎焊 ;

[0034] The total throat area M is determined by the average inlet throat diameter Average inlet channel height Brazing error Δ 钎焊 And the number of blade channels N is determined by the following formula:

[0035]

[0036] The average inlet throat diameter The average inlet channel height The total throat area M, the brazing error Δ 钎焊 , the throat area M of the single piece d and the required average inlet channel height All are range values, recorded as the average inlet throat diameter Average inlet channel height Total throat area M(M min , M max ), brazing error Δ 钎焊 (0, Δ 钎焊 ), throat area of ​​a single piece Md (M dmin , M dmax ), required average inlet channel height in, Indicates the minimum value of the average inlet throat diameter, Indicates the maximum value of the average inlet throat diameter; Indicates the minimum value of the average inlet channel height, Indicates the maximum value of the average inlet channel height; M min Indicates the minimum total throat area, M max Indicates the maximum total throat area; M dmin Indicates the minimum throat area in a single piece, M dmax It indicates the maximum throat area in a single piece; Indicates the minimum required average inlet channel height, Indicates the maximum required average inlet channel height.

[0037] S2: Determine the throat area M of a single piece based on the diffuser data d ;

[0038] The formula is as follows:

[0039]

[0040] S3: Obtain the measured average inlet throat diameter Based on the throat area M of the single piece d and the measured average inlet throat diameter Calculate the required average inlet channel height

[0041] The formula is as follows:

[0042]

[0043] M dmin and M dmax Substituting this gives:

[0044]

[0045] S4: Average inlet channel height based on the requirements Brazing is performed to achieve the purpose of controlling the total throat area M;

[0046] The average inlet passage height is increased by grinding the blade tip Maintain the required average inlet channel height In the value range of Figure 3 shown.

[0047] After the assembly is brazed, the diffuser inlet channel height is measured and the throat area of ​​the assembly is calculated. The method is verified and the requirements for the throat area of ​​the assembly are as follows: Figure 4 shown.

[0048] Diffuser throat area calculation example.

[0049] 1) According to the existing plan:

[0050] Design input requirements: Diffuser throat area requirement in the component M = (1980 ~ 2040) mm 2 ;

[0051] Existing design: Take the single piece according to processing experience The height error caused by brazing is (0-0.1) mm, and the number of blade channels is 17;

[0052] Problems with the existing design: It can be calculated that the throat area of ​​the diffuser component is (1965.88~2040)mm without exceeding the tolerance. 2 , the actual area is wider than the design requirement. Therefore, even if the size of a single piece is qualified, the throat area will be out of tolerance and can only be Figure 2 Polish and repair the inlet blade shape to ensure the throat area requirements. If the throat area requirements of the component need to be met during the design stage, When the tolerance range remains unchanged ( The value is guaranteed by the blade profile machining accuracy and should not be changed). The processing tolerance zone is only 0.03mm, which greatly increases the processing difficulty.

[0053] 2) According to this method:

[0054] Still take the diffuser throat area requirement in the assembly as M = (1980 ~ 2040) mm 2 , single piece The height error caused by brazing is (0-0.1) mm, and the number of blade channels is 17;

[0055] Then the throat area of ​​a single piece is M d =(1980~2019.6)mm 2 ;

[0056] Assumptions at this time The processing tolerance is 0.19mm, which can greatly reduce the processing difficulty.

[0057] At the same time, the throat area of ​​a single piece is at the lower limit of the design input area requirement. However, in the assembly welding process, the throat area can only be increased due to the existence of the weld height, so it is easier to ensure the final throat area after welding.

[0058] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for controlling the throat area of ​​a blade diffuser, characterized in that: The following steps are involved: Acquire diffuser data, the diffuser data including the average inlet throat diameter Average inlet channel height Number of blade passages N, total throat area M and brazing error Δ 钎焊 ; Based on the diffuser data, the throat area M of a single piece is defined d ; Get the measured average inlet throat diameter Based on the throat area M of the single piece d and the measured average inlet throat diameter Calculate the required average inlet channel height Average inlet channel height based on the requirements Brazing is performed to achieve the purpose of controlling the total throat area M; The average inlet throat diameter The average inlet channel height The total throat area M, the brazing error Δ 钎焊 , the throat area M of the single piece d and the required average inlet channel height All are range values, recorded as the average inlet throat diameter Average inlet channel height Total throat area M(M min , M max ), brazing error Δ 钎焊 (0, Δ 钎焊 ), throat area of ​​a single piece M d (M dmin , M dmax ), required average inlet channel height in, Indicates the minimum value of the average inlet throat diameter, Indicates the maximum value of the average inlet throat diameter; Indicates the minimum value of the average inlet channel height, Indicates the maximum value of the average inlet channel height; M min Indicates the minimum total throat area, M max Indicates the maximum total throat area; M dmin Indicates the minimum throat area in a single piece, M dmax It indicates the maximum throat area in a single piece; Indicates the minimum required average inlet channel height, Indicates the maximum required average inlet channel height; The total throat area M is determined by the average inlet throat diameter Average inlet channel height Brazing error Δ 钎焊 And the number of blade channels N is calculated, the formula is as follows: Based on the diffuser data, the throat area M of a single piece is defined d The formula is as follows: Based on the throat area M of the single piece d and the measured average inlet throat diameter Calculate the required average inlet channel height The formula is as follows: M dmin and M dmax Substituting this gives:

2. A method for controlling the throat area of ​​a vane diffuser according to claim 1, characterized in that: The average inlet passage height is increased by grinding the blade tip Maintain the required average inlet channel height is within the value range of .

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