Turbine guider air flow value adjusting method and aero-engine

Abstract

The invention discloses a turbine guider air flow value adjusting method and an aero-engine, a turbine guider comprises guide blades, the adjusting method comprises the steps that a first set of blades and a second set of blades are machined, and compared with the first set of blades, the tail edge length of the second set of blades is increased and / or the angle variation of the installation angle is reduced within the design range; measuring the tail edge lengths and the mounting angles of all the blades; the influence of the blade on the air flow value is calculated according to the difference value between the actual trailing edge length and the theoretical trailing edge length of the blade, and the influence of the blade on the air flow value is calculated according to the difference value between the actual installation angle and the theoretical installation angle of the blade; and selecting the first group of blades and the second group of blades according to the theoretical air flow value and the actual air flow value demand of the blades and the influence of each blade on the air flow value.

Description

Technical Field

[0001] The present invention relates to the technical field of turbine guide vane air flow adjustment, in particular, to a turbine guide vane air flow value adjustment method. In addition, the present invention also relates to an aircraft engine including the turbine guide vane air flow value adjustment method. Background Art

[0002] The first-stage guide vane of a certain type of engine gas turbine is composed of the first-stage guide vane of the gas turbine, the guide vane bracket, and the Ω-shaped sealing ring. The first-stage guide vane fan-shaped parts of the gas turbine are welded by two guide vanes by argon arc welding, and there are 12 sets of fan-shaped parts in total. The guide vanes are hollow cooling, precision-cast blades with no allowance on the blade body, and the surfaces of the blades and the upper and lower edge plate flow channels are infiltrated with aluminum. The 12 guide vane fan-shaped parts and the upper and lower edge plate sealing pieces are sequentially installed in the Ω-shaped sealing ring, and then the guide vanes and guide rings are fixed to the guide vane bracket through the inner mounting edge of the guide vanes with 12 bolts.

[0003] The channel area of ​​turbine guide vane parts is an important parameter that determines the power and performance of turboshaft engines. The flow area of ​​such parts needs to be tested and controlled before assembly. Turbofan engines are generally measured using geometric methods. Accurate measurement of the flow area of ​​turboshaft engines is more sensitive to performance and is generally measured using fluid methods. This type of gas turbine first-stage guide vane assembly has been undergoing stream function tests. As the engine design is finalized and enters the mass production stage, the number of production tasks has increased significantly compared to the scientific research stage. The stream function test cycle is long, the cost is high, and the test bench resources are tight and it is difficult to meet production delivery needs. The flow function test process of the guide vane leads to a production bottleneck. Therefore, the air flow replaces the stream function test verification. To ensure the qualified stream function value, the upper and lower limits of the air flow fluctuation value are reduced by 25% relative to the stream function fluctuation range. The qualified range of the replaced air flow is more stringent, and the stream function value (100~103) The qualified range of the air flow after replacement is relatively stricter, and the qualified range of the air flow value is (3.71~3.80)In 2 . After the blades processed by the original process were measured, the air flow was too large and exceeded the design size. The final measured value was in the range of 3.763 to 3.852. The qualified rate of the air flow value after one assembly was only about 36%. The air flow value was unqualified. The unqualified assembly parts needed to be replaced, and then repeated assembly and air flow test were repeated. The test cycle was 3 days. The unstable air flow value caused the production cycle to be seriously extended. Therefore, it is urgent to improve the qualified rate of the air flow value after one assembly to meet production needs and improve assembly efficiency. Summary of the invention

[0004] The present invention provides a method for adjusting the air flow value of a turbine guide vane and an aircraft engine, so as to solve the technical problem that the qualified rate of air flow value is low after the stream function test is changed to an air flow test in the existing batch production demand of turbine guide vanes.

[0005] According to one aspect of the present invention, a method for adjusting the air flow value of a turbine guide vane is provided, wherein the turbine guide vane includes a guide vane, and the adjustment method includes:

[0006] S1. Processing the first set of blades and the second set of blades respectively, wherein the second set of blades increases the trailing edge length and / or reduces the angle variation of the installation angle within the design range compared with the first set of blades;

[0007] S2. Measure the trailing edge length and installation angle of all blades;

[0008] S3. Calculate the influence of the blade on the air flow value according to the difference between the actual trailing edge length of the blade and the theoretical trailing edge length, and calculate the influence of the blade on the air flow value according to the difference between the actual installation angle of the blade and the theoretical installation angle;

[0009] S4. Select the first group of blades and the second group of blades according to the theoretical air flow value of the blades, the actual air flow value requirement, and the influence of each blade on the air flow value.

[0010] As a further improvement of the above technical solution, step S1 includes: the trailing edge length of the first group of blades is processed according to the design tolerance, and the trailing edge length of the second group of blades is processed according to the middle and upper difference range of the design tolerance.

[0011] As a further improvement of the above technical solution, the adjustment method includes: the trailing edge length of the first group of blades is controlled according to L(+0.1, -0.1), and the trailing edge length of the second group of blades is controlled according to L(+0.1, -0.02), where L is the design value of the trailing edge length of the blades.

[0012] As a further improvement of the above technical solution, the adjustment method includes: using a through-stop gauge to measure the length of the trailing edge of the first group of blades, the through end of the gauge is the lower difference L-0.1 of the trailing edge length, and the stop end of the gauge is the upper difference L+0.1 of the trailing edge length; when measuring the length of the trailing edge of the second group of blades, a feeler gauge of 0.08 mm is set at the bottom of the gauge.

[0013] As a further improvement of the above technical solution, when reducing the angle variation of the installation angle, the adjustment method includes: clamping and positioning the surface of the hollowed-out blade after welding and before machining.

[0014] As a further improvement of the above technical solution, the adjustment method also includes: when the actual trailing edge length increases by 0.1 mm compared with the theoretical trailing edge length, the air flow value decreases by 0.028 In2 Calculate the effect of blades on air flow value. When the actual installation angle is reduced by 0.1° compared with the theoretical installation angle, the air flow value decreases by 0.028In. 2 Calculate the effect of blades on air flow values.

[0015] As a further improvement of the above technical solution, the adjustment method also includes: if the air flow value is too large, according to a=(X-3.8) / 0.016, a first group of blades are replaced with a second group of blades; if the air flow value is too small, according to b=(X-3.8) / 0.016, b second group of blades are replaced with the first group of blades.

[0016] As a further improvement of the above technical solution, it also includes step S5: selecting at least two blades of the first group or at least two blades of the second group, and the selected blades of the first group and the selected blades of the second group are evenly distributed and assembled on the turbine guide vane.

[0017] As a further improvement of the above technical solution, the optional number of the second set of blades is 2-4 pieces.

[0018] According to another aspect of the present invention, there is also provided an aircraft engine, which includes the above-mentioned turbine guide vane air flow value adjustment method.

[0019] The present invention has the following beneficial effects:

[0020] The first group of blades are processed according to the conventional processing method during the processing stage. The present adjustment method processes the second group of blades by increasing the trailing edge length and / or reducing the angle change of the installation angle within the design range, and measures the trailing edge length and installation angle of all blades. At the same time, the influence of the blade on the air flow value is calculated according to the difference between the actual trailing edge length and the theoretical trailing edge length of the blade, and the influence of the blade on the air flow value is calculated according to the difference between the actual installation angle and the theoretical installation angle of the blade, so that the influence of each blade on the theoretical value can be obtained, and the blades are matched and selected so that the air flow value after being applied to the guide is within the qualified range. The present adjustment method reasonably controls the trailing edge length and installation angle of the blade parts by improving the front-end processing and assembly process, thereby stably controlling the air flow value. The parts can meet the requirements of large-scale formal production and greatly improve the test pass rate to more than 98%. A very small number of products with unqualified air flow values ​​can also meet the qualified requirements through one-time troubleshooting based on this adjustment method.

[0021] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 It is a structural schematic diagram of a turbine guide device in the prior art;

[0024] Figure 2 is a schematic diagram of the throat area of ​​a first-stage guide blade of a gas turbine in the prior art;

[0025] Figure 3 This is a schematic diagram of the blade trailing edge processing dimensions in the prior art Figure 1 ;

[0026] Figure 4 This is a schematic diagram of the blade trailing edge processing dimensions in the prior art Figure 2 ;

[0027] Figure 5 It is a schematic diagram of the processing of the surface grinding to form the installation angle in the prior art;

[0028] Figure 6 is a schematic diagram of the trailing edge measurement of the prior art;

[0029] Figure 7 is the change in AK value after a 0.08 mm feeler gauge is placed on the bottom of the gauge in the preferred embodiment of the present invention;

[0030] Figure 8 It is a schematic diagram of blade machining positioning in the prior art;

[0031] Fig. 9 It is a schematic diagram of a prior art blade welded with a feeler gauge using an assembly fixture;

[0032] Fig.10 The blade machining positioning diagram of the preferred embodiment of the present invention is Figure 1 ;

[0033] Fig.11 The blade machining positioning diagram of the preferred embodiment of the present invention is Figure 2 ;

[0034] Fig.12 It is a schematic diagram of a blade profile installation angle change of 0.1° in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, but the present invention can be implemented in a variety of different ways as defined and covered below.

[0036] like Figures 1 to 12As shown, in the method for adjusting the air flow value of the turbine guide vane of this embodiment, the turbine guide vane includes guide vanes, and the adjustment method includes:

[0037] S1. Processing the first set of blades and the second set of blades respectively, wherein the second set of blades increases the trailing edge length and / or reduces the angle variation of the installation angle within the design range compared with the first set of blades;

[0038] S2. Measure the trailing edge length and installation angle of all blades;

[0039] S3. Calculate the influence of the blade on the air flow value according to the difference between the actual trailing edge length of the blade and the theoretical trailing edge length, and calculate the influence of the blade on the air flow value according to the difference between the actual installation angle of the blade and the theoretical installation angle;

[0040] S4. Select the first group of blades and the second group of blades according to the theoretical air flow value of the blades, the actual air flow value requirement, and the influence of each blade on the air flow value.

[0041] It should be noted that before implementing the technical solution of the preferred embodiment, a study on the factors affecting the blade air flow was conducted. First, the assembly influence was considered. The assembly process of the turbine guide device needs to ensure the side clearance (0.15mm-0.45mm) between the guide blade fan-shaped parts, and measure the misalignment of the inner and outer edge plates of the guide blades (not more than 0.25mm). The assembly process requirements are relatively strict. Two engines were selected for testing, numbered 1 and 2, and the first-stage guide blades of the gas turbine were repeatedly disassembled and assembled. When the assembly order remained unchanged, the test data are shown in Table 1.

[0042]

[0043] Table 1

[0044] Similarly, engines No. 1 and No. 2 were selected for testing. When the assembly order was random, the test data were shown in Table 2.

[0045] Machine number Air flow value Reassembly Disassemble again 1 3.832 3.833 3.830 2 3.789 3.790 3.787

[0046] Table 2

[0047] Similarly, the No. 1 and No. 2 engines were selected for testing. After the fan blades of No. 1 and No. 2 were swapped, the test data was as follows:

[0048] Table 3,

[0049] Machine number Air flow value After fan blades are exchanged 1 3.832 3.788 2 3.789 3.833

[0050] Table 3

[0051] The test results show that, under the condition of meeting the relevant dimensional requirements of the design requirements, the assembly repeatability is good and the influence on the air flow value is small. The test results show that the gas turbine first-stage guide vane itself determines the air flow.

[0052] According to the gas turbine first-stage guide vane design requirements, the qualified range of the stream function value is (100~103) According to the flow equation: It can be seen that the stream function (i.e., reduced flow) W g It has a linear relationship with the guide vane outlet area A (i.e., blade throat area). After replacing the stream function with the air flow, the air flow has a linear relationship with the guide vane outlet area (blade throat area). Figure 2 Schematic diagram of the blade throat area. The four related dimensions that affect its size are AK, AP, TW, and β°. The sizes of the four dimensions directly affect the area value of the throat section.

[0053] according to Figure 2 The four parameters that affect the air flow value, AK, AP, TW, and β°, can be traced back to the corresponding process in the processing technology. The three parameters AK, AP, and TW are the width and length of the throat section, which are related to the length of the trailing edge of the part blade, and correspond to the process of cutting the length of the trailing edge of the blade during the part processing. When the trailing edge becomes longer, the throat area between the two blades of the part becomes smaller, and vice versa. β° is related to the installation angle of the part blade, and corresponds to the process of grinding the side and end faces of the blade basin of the part during the processing. When the angle value becomes larger, the corresponding throat area becomes smaller, and vice versa.

[0054] The processing method and processing size diagram of the blade cutting trailing edge of the part are as follows Figure 3 to Figure 4 As shown, the blade back side and the end face close to the air inlet edge are used for positioning, and the trailing edge of the blade is cut to form the length of the first group or the second group respectively. From the positioning method, it can be seen that in addition to the influence of the fluctuation of the dimensional tolerance L±0.1 during the processing, the dimension L1 (0, -0.08) from the blade back to the blade basin side has a fluctuation of 0.08 (i.e., the dimensional tolerance of the processing blade back side). This dimensional tolerance will have an equal dimensional influence on the trailing edge length. Therefore, the change of the trailing edge length should be minimized during the processing to control its influence on the air flow value.

[0055] The schematic diagram of the surface grinding dimensions of parts is as follows: Figure 5 As shown in the figure, the installation angle β° is formed during the assembly of the parts. The combustion guide vane is formed by welding the left and right blades. After welding, there is a step value of less than 0.1mm on the left and right ends of the M and N surfaces. Since the subsequent processing must use the M and N surfaces as the positioning reference, the step must be removed in the machining process after welding. In the case of large air flow values, the Figure 5 β° in order to reduce the air flow value.

[0056] For the actual air flow unqualified product size analysis, the engine blade was selected and numbered No. 3, whose air flow value was 3.832, and the blade shape of the part was accurately analyzed. After three-dimensional scanning, the results are shown in Table 4.

[0057]

[0058]

[0059] Table 4

[0060] The statistical analysis results are shown in Table 4. From the data in Table 4, we can see that the average length of the trailing edge of the left and right blades is too small. Compared with the theoretical value, most of the trailing edge lengths are in the middle and lower range. The installation angles of the left and right blades are too small. According to the analysis of the factors affecting air flow, the short trailing edge and small installation angle will lead to a large air flow value.

[0061] Based on the above research and analysis, it can be known that the air flow value of the gas turbine first-stage guide vane assembly is determined by the gas turbine first-stage guide vane assembly itself, among which the trailing edge length and the component installation angle are the key factors affecting the air flow value. When the air flow value is too large, how to increase the trailing edge length and increase the installation angle is a difficult problem in the research of this technical solution.

[0062] It can be understood that the first group of blades are processed according to the conventional processing method during the processing stage. The present adjustment method processes the second group of blades by increasing the trailing edge length and / or reducing the angle change of the installation angle within the design range, and measures the trailing edge length and installation angle of all blades. At the same time, the influence of the blade on the air flow value is calculated according to the difference between the actual trailing edge length and the theoretical trailing edge length of the blade, and the influence of the blade on the air flow value is calculated according to the difference between the actual installation angle and the theoretical installation angle of the blade. The influence of each blade on the theoretical value can be obtained, and the blades are matched and selected so that the air flow value after being applied to the guide is within the qualified range. The present adjustment method reasonably controls the trailing edge length and installation angle of the blade parts by improving the front-end processing and assembly process, thereby stably controlling the air flow value. The parts can meet the requirements of large-scale formal production and greatly improve the test pass rate to more than 98%. A very small number of products with unqualified air flow values ​​can also meet the qualified requirements through one-time troubleshooting based on this adjustment method.

[0063] In this embodiment, step S1 includes: the trailing edge length of the first group of blades is processed according to the design tolerance, and the trailing edge length of the second group of blades is processed according to the middle and upper difference range of the design tolerance; wherein, the trailing edge length of the first group of blades is controlled according to L (+0.1, -0.1), and the trailing edge length of the second group of blades is controlled according to L (+0.1, -0.02), and L is the design value of the trailing edge length of the blades; based on the above research and analysis, this adjustment method achieves the purpose of controlling the trailing edge length of the second group of blades within the middle and upper difference range allowed by the set value by reducing the lower deviation of the trailing edge.

[0064] Specifically, a through-and-stop gauge is used to measure the length of the trailing edge of the first group of blades, with the through end of the gauge being the lower difference L-0.1 of the trailing edge length, and the stop end of the gauge being the upper difference L+0.1 of the trailing edge length. When measuring the length of the trailing edge of the second group of blades, a feeler gauge of 0.08 mm is set at the bottom of the gauge to control the lower difference of the trailing edge length at L-0.02, thereby lengthening the trailing edge length and controlling the trailing edge length within the middle and upper difference.

[0065] Referring to Table 5, by comparing the dimensions of the first group of blades, the second group of blades, and the third group of blank blades without trailing edge cut-off, it can be seen that, assuming that the installation angle remains unchanged, when the trailing edge length increases by 0.08mm, it is equivalent to a decrease in throat width of 0.0346. According to the blade throat area parameter, the theoretical average throat width of the first group of blades is (5.436+6.238) / 2=5.837. When the width is reduced by 0.0346, the percentage of reduction in the roar area value is approximately 0.0346 / 5.837=0.59%, which means that the air flow value is reduced by approximately 0.59%. The qualified range of the air flow value is 3.7~3.8. According to the mean value calculation, when the width changes by 0.0346, the air flow value is reduced by approximately 3.75×0.0059=0.022In. 2 .

[0066]

[0067] Table 5

[0068] It can be seen from Table 5 that increasing the trailing edge length can reduce the air flow value, but there are uncertain factors: for parts with large original air flow values, although the trailing edge length is not controlled according to the middle and upper difference, there are also cases where the trailing edges of some first group of blade parts are in the middle and upper difference, so the range of the air flow value that can be reduced is 0 to 0.022In 2 .

[0069] In this embodiment, when reducing the variation of the installation angle, the adjustment method includes: after welding is completed and before machining, the clamping and positioning surface of the hollowed-out blade;

[0070] It should be noted that in the prior art, the combustion guide vane is welded (argon arc welding) by left and right blades, and the welding fixture positions its two positioning surfaces. The parts on the side of the blade basin are pre-tightened, and the movable pressure plate is on the back side of the blade. After tightening the pressure plate handle, the blade on the side of the blade basin will be offset by about 0.1 mm due to the squeezing effect of the adjacent blades, which will cause the two ends of the M and N positioning surfaces of the blade to be misaligned by about 0.1 mm; after welding, since the subsequent machining process uses the above-mentioned M and N positioning surfaces for positioning, the two positioning surfaces must be ground to ensure that the two ends of the positioning surfaces are in the same plane. The grinding amount should be as small as possible to reduce the impact on the blade profile position. The existing processing method uses an assembly fixture for processing, and the positioning surface is the entire bottom plane. In order to ensure that the fixture positioning surface fits the left and right ends of the bottom of the part, such as Fig. 9 As shown, a 0.1mm feeler gauge is placed at the bottom of the fixture near the blade basin. Combined with the length of the bottom positioning surface ≈ 25, the angle change value tanβ=0.1 / 50, it can be concluded that β≈0.1°. In summary, after welding and machining, when a 0.1mm feeler gauge is placed at the bottom, the change in the part installation angle is about 0.1°, and this change will cause the air flow value to increase.

[0071] In order to reduce the angle effect caused by the above processing process, this embodiment adopts Fig.10 The positioning method shown Style, will be installed The middle of the clamp positioning surface is hollowed out to avoid the positioning influence of the protruding part in the middle of the part. At this time, there is no need to pad a 0.1mm feeler gauge, which can achieve the purpose of both the left and right ends of the bottom being in contact with the clamp positioning surface, eliminating the influence of the 0.1° angle change in the original processing method.

[0072] When the blade installation angle changes by 0.1°, Fig.12 As shown, it is equivalent to a reduction of 0.043 in the throat width of the part, and the corresponding throat area value is reduced by about 0.043 / 5.837=0.74%, and the air flow value is reduced by about 3.75*0.0073=0.028In 2 The tolerance range of the design installation angle is β±20' (β±0.333°). The original processing blade installation angle is too small (negative value). The angle can be changed in the direction of increase by at least about 0.3°, that is, the adjustment of the installation angle of 0.1° is within the design tolerance range. Therefore, this embodiment can stably reduce the air flow value by 0.028In 2 / tower.

[0073] In this embodiment, the adjustment method further includes: when the actual trailing edge length increases by 0.1 mm compared to the theoretical trailing edge length, the air flow value decreases by 0.028 In. 2 Calculate the effect of blades on air flow value. When the actual installation angle is reduced by 0.1° compared with the theoretical installation angle, the air flow value decreases by 0.028In. 2 Calculate the effect of blades on air flow values.

[0074] In this embodiment, based on the above statistical data, the trailing edge length of the second set of blades is about 0.695 longer than that of the first set of blades. Each additional blade of the second set is equivalent to lengthening the guide consisting of one blade of the first set by 0.695 / 12=0.058, that is, the throat area width is reduced by 0.0251, and the corresponding throat area value reduction percentage is about 0.0251 / 5.837=0.43%, and the theoretical reduction of the air flow value is about 3.75*0.0043=0.016; the theoretical range of the reduction of the air flow value is (0.028+0.016*a)In 2 ~(0.022+0.028+0.016*a)In 2 , a is the number of the second set of blades; taking 2-4 second set of blades as an example, the reduction in air flow value is 0.06~0.114In 2 The larger range of the statistical air flow value in a certain year is about 3.803In 2 ~3.852In 2 , minus the corresponding value of the change, the theoretical minimum possible air flow value is 3.689In 2 , the possible maximum value is 3.792In 2 ,

[0075] Based on this, the adjustment method also includes: if the air flow value is too large, according to a = (X-3.8) / 0.016, a first set of blades are replaced with the second set of blades; if the air flow value is too small, according to b = (X-3.8) / 0.016, b second set of blades are replaced with the first set of blades, X is the air flow value, and the calculated (X-3.8) / 0.016 is an upward integer; in a preferred embodiment, when the installation angle is 0°, the air flow is optimal (the air flow is about 3.75In 2 ) The ratio is 9 first-group blades + 3 second-group blades; in actual situations, the average value of the installation angle is as large as 0.09°, so it is preferred to select 2-4 second-group blades.

[0076] In this embodiment, step S5 is also included: at least two first-group blades or at least two second-group blades are selected, and the selected first-group blades and the selected second-group blades are evenly distributed and assembled on the turbine guide vane; taking 12 fan-shaped parts with 10 first-group blades and 2 second-group blades as an example, during the assembly process, the two second-group blades are symmetrically distributed, and the first-group blades are installed in the remaining positions. Taking 3 second-group blades as an example, 1 second-group blade is installed for every 3 first-group blades, and the 3 second-group blades are evenly distributed at 120° intervals to ensure the uniformity of the temperature difference of test T45.

[0077] The adjustment method of this embodiment processes a type of fuel-guide vane, and through the reasonable control of the trailing edge length and installation angle of the parts, the stability of its air flow value is effectively controlled. The process technology plan has been implemented in the formal process, and subsequent parts can be mass-produced according to the formal process. After the measures are implemented, the pass rate of the fuel-guide air flow test is more than 98%, and a very small number of products with unqualified air flow values ​​can also meet the qualified requirements based on the one-time troubleshooting of this adjustment method.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The present invention is susceptible to various modifications and variations. Any modification made within the spirit and principle of the present invention is Change, etc. All replacements, improvements, etc. should be included in the protection scope of the present invention.

Claims

1. A method for adjusting the air flow value of a turbine guide vane, wherein the turbine guide vane comprises a guide vane, characterized in that: The adjustment method comprises: S1. Processing the first set of blades and the second set of blades respectively, wherein the second set of blades increases the trailing edge length and / or reduces the angle variation of the installation angle within the design range compared with the first set of blades; S2. Measure the trailing edge length and installation angle of all blades; S3. Calculate the influence of the blade on the air flow value according to the difference between the actual trailing edge length of the blade and the theoretical trailing edge length, and calculate the influence of the blade on the air flow value according to the difference between the actual installation angle of the blade and the theoretical installation angle; S4. Select the first group of blades and the second group of blades according to the theoretical air flow value of the blades, the actual air flow value requirement, and the influence of each blade on the air flow value.

2. The method for adjusting the air flow value of a turbine guide vane according to claim 1, characterized in that: Step S1 includes: the trailing edge length of the first group of blades is processed according to the design tolerance, and the trailing edge length of the second group of blades is processed according to the middle and upper difference range of the design tolerance.

3. The method for adjusting the air flow value of a turbine guide vane according to claim 2, characterized in that: The adjustment method includes: the trailing edge length of the first group of blades is controlled according to L(+0.1,-0.1), and the trailing edge length of the second group of blades is controlled according to L(+0.1,-0.02), where L is the design value of the trailing edge length of the blades.

4. The method for adjusting the air flow value of a turbine guide vane according to claim 3, characterized in that: The adjustment method includes: using a through-stop gauge to measure the length of the trailing edge of the first group of blades, the through end of the gauge is the lower difference L-0.1 of the trailing edge length, and the stop end of the gauge is the upper difference L+0.1 of the trailing edge length; when measuring the length of the trailing edge of the second group of blades, a feeler gauge of 0.08 mm is set at the bottom of the gauge.

5. The method for adjusting the air flow value of a turbine guide vane according to claim 1, characterized in that: When reducing the angle variation of the installation angle, the adjustment method includes: after welding is completed and before machining, the clamping and positioning surface of the hollowed-out blade is performed.

6. The method for adjusting the air flow value of a turbine guide vane according to claim 1, characterized in that: The adjustment method further includes: for every 0.1 mm increase in the actual trailing edge length compared to the theoretical trailing edge length, the air flow value is reduced by 0.028 In 2 Calculate the effect of blades on air flow value. When the actual installation angle is reduced by 0.1° compared with the theoretical installation angle, the air flow value decreases by 0.028In. 2 Calculate the effect of blades on air flow values.

7. The method for adjusting the air flow value of a turbine guide vane according to claim 1, characterized in that: The adjustment method also includes: if the air flow value is too large, according to a=(X-3.8) / 0.016, a first group of blades are replaced with a second group of blades; if the air flow value is too small, according to b=(X-3.8) / 0.016, b second group of blades are replaced with the first group of blades.

8. The method for adjusting the air flow value of a turbine guide vane according to claim 1, characterized in that: The method further comprises step S5: selecting at least two blades of the first group or at least two blades of the second group, and assembling the selected blades of the first group and the selected blades of the second group evenly distributed on the turbine guide vane.

9. The method for adjusting the air flow value of a turbine guide vane according to any one of claims 1 to 8, characterized in that: The optional quantity of the second set of blades is 2-4 pieces.

10. An aircraft engine, characterized in that: The invention relates to a method for adjusting the air flow value of a turbine guide vane according to any one of claims 1 to 8.

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