Throat area adjustment method, turbine guide vane manufacturing method, and turbine guide vane

Abstract

The present application aims to provide a throat area adjustment method, a turbine guide vane manufacturing method and a turbine guide vane, the throat area adjustment method comprising the following steps: obtaining a guide vane group to be corrected, machining the rim plate of the first guide vane and / or the second guide vane, cutting off part of the trailing edge of the first guide vane and the second guide vane, and polishing the back of the first guide vane and the second guide vane, whether the above three processes are performed or not is determined by comparing the actual measured throat area with the designed throat area, and the turbine guide vane meeting the throat area design requirements can be easily obtained through the throat area adjustment method.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine engine manufacturing, in particular to a throat area adjustment method, a turbine guide vane manufacturing method and a turbine guide vane. BACKGROUND

[0002] As one of the key components of an aero-engine, a gas turbine has typical characteristics of high temperature, high pressure and high speed, and its performance directly determines the thrust, fuel consumption level and working reliability of the engine. The throat area of the turbine guide vane is a key factor for controlling the flow of the entire aero-engine, and plays a crucial role in the performance debugging of the engine and the adjustment of the turbine working point.

[0003] The turbine guide vane in an aero-engine and a gas turbine is completed in the form of casting followed by mechanical machining. After the turbine guide vane is completed by casting, the profile size of the vane is determined. If the conventional process of directly batch machining and then assembling is followed, the throat area of the entire ring of guide vanes is greatly affected by uncontrollable factors such as machining and assembly. Various deviations are superimposed on each other, resulting in a large uncertainty of the throat area of the entire ring. When the measurement of the throat area of the entire ring of guide vanes is completed, the margin of adjustable throat area is limited from the perspective of the entire engine cycle and cost.

[0004] When the throat area of the turbine guide vane is smaller than the design requirement, the flow capacity of the guide vane is affected, the performance of the turbine is not fully utilized, and the stability of the entire engine during testing and operation is affected. Therefore, it is urgent to provide a manufacturing process that can easily obtain a turbine guide vane that meets the design requirements of the throat area. SUMMARY

[0005] The purpose of the present application is to provide a throat area adjustment method that can easily obtain a turbine guide vane that meets the design requirements of the throat area.

[0006] To achieve the foregoing purpose, the throat area adjustment method comprises the following steps:

[0007] a. obtaining a to-be-corrected guide vane group, wherein the to-be-corrected guide vane group includes a first guide vane and a second guide vane, and the throat area is defined between the back of the first guide vane and the trailing edge of the second guide vane;

[0008] b. machining the edge plate of the first guide vane and / or the second guide vane;

[0009] c. measuring the throat area between the guide vanes in the to-be-corrected guide vane group after assembly, and comparing it with the design value of the throat area to obtain a first error value;

[0010] d. determining whether the first error value is greater than a threshold value, if less than the threshold value, completing the guide vane throat area adjustment, if greater than the threshold value, continuing to step e;

[0011] e. cutting off part of the trailing edge of the first guide vane and the second guide vane;

[0012] f. measuring the throat area between the guide vanes in the guide vane group to be corrected after assembly, and comparing it with the design value of the throat area, to obtain a second error value;

[0013] g. determining whether the second error value is greater than a threshold value, if less than the threshold value, completing the guide vane throat area adjustment, if greater than the threshold value, continuing to step h;

[0014] h. polishing the back of the first guide vane and the second guide vane;

[0015] i. measuring the throat area between the guide vanes in the guide vane group to be corrected after assembly, and comparing it with the design value of the throat area, to obtain a third error value;

[0016] j. determining whether the third error value is greater than a threshold value, if less than the threshold value, completing the guide vane throat area adjustment, if greater than the threshold value, repeating steps h to i until the third error value is less than the threshold value.

[0017] In one or more embodiments, in step b, the edge plate of the first guide vane and / or the second guide vane is processed by changing the angle of machining to change the throat area in the guide vane group to be corrected after assembly.

[0018] In one or more embodiments, in step e, the throat area after cutting off part of the trailing edge needs to meet: the throat area is still defined by the back of the first guide vane and the trailing edge of the second guide vane.

[0019] In one or more embodiments, in step e, the second guide vane trailing edge arc portion before cutting off part of the trailing edge has a first diameter, and the second guide vane trailing edge arc portion after cutting off part of the trailing edge has a second diameter;

[0020] Wherein, the second diameter is not greater than 1.5 times the first diameter.

[0021] In one or more embodiments, in step e, grinding machining is used to remove part of the trailing edge of the first guide vane and the second guide vane.

[0022] In one or more embodiments, in step e, after using grinding machining to remove part of the trailing edge of the first guide vane and the second guide vane, the trailing edge of the second guide vane is polished.

[0023] In one or more embodiments, in step h, the first guide vane and the second guide vane are polished at a position where the back curvature is larger.

[0024] In one or more embodiments, in step h, the first guide vane and the second guide vane are polished at a position where the back curvature is larger.

[0025] In another aspect, according to some embodiments of the present application, a turbine guide vane manufacturing method is also provided, which comprises the following steps:

[0026] The guide vanes are installed into the guide vane, so that each guide vane forms a complete ring in the guide vane;

[0027] The throat area between adjacent guide vanes is measured to obtain a throat area measured value;

[0028] The throat area measured value is compared with a throat area design value to obtain an initial error, if the initial error is greater than a threshold value, and the throat area measured value is less than the throat area design value, the adjacent guide vanes are defined as a to-be-corrected guide vane group, and the throat area adjustment method as described above is used to adjust the throat area between the to-be-corrected guide vane group.

[0029] In another aspect, according to some embodiments of the present application, a turbine guide vane is also provided, which is manufactured by using the turbine guide vane manufacturing method as described above.

[0030] The present application has the following advantages:

[0031] The throat area adjustment method adjusts the angle of the rim plate first, if the throat area does not meet the requirements, the tail edge is cut, and if the throat area still does not meet the requirements, the back of the blade is polished. Since the rim plate has no effect on the shape of the blade, the throat area can be adjusted in a larger range. Although the tail edge is cut, the throat area can be adjusted to a certain extent, although the shape of the blade is changed, the change is small. Finally, the back of the blade is polished to increase the throat area, so that the throat area can be adjusted to meet the requirements while the effect on the shape of the blade is small.

[0032] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and to implement the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art, upon reading the following detailed description of the preferred embodiment. The accompanying drawings are included to provide a better understanding of the preferred embodiment, and are not intended to restrict the application of the application. Moreover, in the drawings, like reference numerals refer to similar components, and in the accompanying sequences that follow, initial letters are used to distinguish between components. In the drawings:

[0034] Figures 1 to 3 A schematic diagram showing the position relationship of the existing guide vanes is shown;

[0035] Figure 4 A schematic diagram showing the flow process according to some embodiments of the present throat area adjustment method is shown;

[0036] Figure 5 A schematic diagram showing the position relationship of the front and rear guide vanes of the milling edge plate is shown;

[0037] Figures 6 to 7 A schematic diagram showing the processing method of the second guide vanes according to some embodiments of the present throat area adjustment method is shown;

[0038] Figure 8 A schematic diagram showing the relative position of the first guide vanes and the second guide vanes is shown;

[0039] Figure 9 A partial enlarged schematic diagram of Figure 8 is shown;

[0040] Figure 10 A schematic diagram showing the guide vanes when the tail edge is cut too much is shown;

[0041] Figure 11 A schematic diagram showing the polishing area of the blade back according to some embodiments of the present throat area adjustment method is shown. DETAILED DESCRIPTION

[0042] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0044] As Figure 1The diagram illustrates the positional relationship between two adjacent turbine guide vanes. The diagram includes two guide vanes 90, each comprising a blade body 91, an inner edge plate 92, and an outer edge plate 93. The guide vanes 90 are typically cast as a single unit, with welded edge plates forming a double-unit structure. The two adjacent blades and their upper and lower edge plates form a relatively independent airflow channel, and the three-dimensional flow at the oblique cut of the exhaust edge is quite complex. Figure 2 The schematic diagram of the oblique cut at the exhaust edge is marked by a dashed box 94. A section of equal blade height is cut from the blades of two adjacent guide vanes to obtain... Figure 3 There is a minimum distance between the trailing edge 95 of one of the two adjacent guide vanes and the back 96 of the other guide vane. This minimum distance is called the throat width 97. The area formed by the throat widths of all cross sections of the blade within the airflow channel is the throat area.

[0045] Turbine guide vanes are manufactured through a process of casting followed by machining. After casting, due to the influence of casting precision, the throat area of ​​the entire guide vane ring is often too small. When the actual throat area is too small, it affects the flow capacity of the guide vane and the performance of the turbine. Currently, the throat area is enlarged using a blade tail-adjusting tool. This method uses a blade back positioning device to position the back of the guide vane, and a blade basin stretching device acts on the blade basin to adjust the blade's trailing edge, thereby enlarging the guide vane throat. However, this method may cause blade deformation and uneven stress on different blades due to manual operation, leading to uneven deformation, stress concentration, and residual stress. Therefore, controlling the throat area of ​​turbine guide vanes is a common and difficult problem to solve in engineering.

[0046] To address the problems existing in current methods for increasing throat area, this application provides a method for adjusting throat area, such as... Figure 4 A flowchart illustrating some embodiments of the throat area adjustment method is shown.

[0047] This method for adjusting the area of ​​the throat includes the following steps:

[0048] Step S101: Obtain the guide vane group to be corrected. Specifically, the guide vane group to be corrected includes a first guide vane and a second guide vane. The relative positional relationship between the first guide vane and the second guide vane can be referred to... Figure 1 The throat area is defined between the back of the first guide vane and the trailing edge of the second guide vane. In the description of the embodiments of this application, the technical terms "first" and "second," such as "first guide vane" and "second guide vane," are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0049] Step S102: machining the rim plate of the first guide vane and / or the second guide vane, in some specific embodiments, machining the outer rim plate and the inner rim plate of the first guide vane and / or the second guide vane. In the description of the embodiments of the present application, the term "and / or" is only used to describe the relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents an "or" relationship between the front and rear associated objects.

[0050] Step S103: measuring the throat area between the guide vanes in the assembled guide vane group to be corrected, and comparing it with the design value of the throat area to obtain a first error value. Specifically, the first guide vane and the second guide vane after machining can be assembled into the guide vane whole ring for measurement.

[0051] Step S104: determining whether the first error value is greater than a threshold value, if less than the threshold value, completing the guide vane throat area adjustment, if greater than the threshold value, continuing to the next step.

[0052] Step S105: cutting part of the tail edge of the first guide vane and the second guide vane. Taking cutting part of the tail edge of the second guide vane 2 as an example, as shown in Figures 6 to 7 shows a schematic diagram of the second guide vane 2, where the dashed part represents the tail edge 95 of the second guide vane 2 before cutting, and the solid part represents the tail edge 95 of the second guide vane 2 after cutting. Figure 8 shows a schematic diagram of the relative position of the first guide vane and the second guide vane, Figure 9 Figure 8 , a local enlarged schematic diagram, as shown in the figure, the throat between the first guide vane 1 and the second guide vane 2 before cutting the tail edge 95 of the second guide vane 2 is x1, and the throat after cutting the tail edge 95 of the second guide vane 2 is x2, and the throat size changes.

[0053] Step S106: measuring the throat area between the guide vanes in the assembled guide vane group to be corrected, and comparing it with the design value of the throat area to obtain a second error value.

[0054] Step S107: determining whether the second error value is greater than a threshold value, if less than the threshold value, completing the guide vane throat area adjustment, if greater than the threshold value, continuing to the next step.

[0055] Step S108: polishing the back of the first guide vane and the second guide vane.

[0056] Step S109: measuring the throat area between the guide vanes in the assembled guide vane group to be corrected, and comparing it with the design value of the throat area to obtain a third error value.

[0057] ​Step S110: Determine whether the third error value is greater than the threshold. If it is less than the threshold, complete the adjustment of the guide vane throat area. If it is greater than the threshold, repeat steps S108 to S109 until the third error value is less than the threshold.

[0058] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0059] In some embodiments of this throat area adjustment method, in step S102, the rim plates of the first and / or second guide vanes are machined by changing the machining angle, thereby fine-tuning the relative positional relationship between the assembled first and second guide vanes to change the throat area in the assembled guide vane assembly. Since turbine guide vanes are manufactured through casting and machining, a certain allowance is left for machining after the raw material is cast. During machining, the throat width of the blade can be fine-tuned by adjusting the machining angle of the rim plate, thus achieving throat area adjustment. Figure 5 As shown, solid outline a indicates the position of the first guide vane 1 in the pre-machined flange assembly state, and dashed outline b indicates the position of the guide vane in the post-machined flange assembly state. As shown, the distance from the trailing edge to the throat point on the blade back (dashed line b1) before adjustment changes with the distance from the trailing edge to the throat point on the blade back (solid line b2) after adjustment, thus enabling the alteration of the throat area between two adjacent guide vanes. In some specific embodiments, the throat area can be increased or decreased using the machined flange.

[0060] In a specific embodiment, the relationship between the throat area and the machining angle of the flange is calculated using the following formula:

[0061] A = 0.084 * alpha (A is the change in throat area (expressed as a percentage), alpha is the blade edge angle, in degrees).

[0062] The machining method performed in step S102 only involves adjusting the machining allowance. The blade profile and the flow channel surface of the rim plate remain unchanged, and the blade geometry is not altered, so it has no impact on aerodynamic performance.

[0063] In some embodiments of this laryngeal area adjustment method, in step S105, the laryngeal area after partial removal of the tail edge must satisfy the following condition: the laryngeal area remains defined between the back of the first guide leaf and the tail edge of the second guide leaf. For example... Figure 10In the shown embodiment, the throat between the left group of vanes is defined by the trailing edge 82 and the trailing edge cut 81, while the throat between the right group of vanes is defined by the trailing edge cut 81 and the trailing edge 83 due to the too large cut of the trailing edge, which changes the components defining the throat and results in a decrease in aerodynamic performance. The throat area is still defined by the trailing edge of the first vane and the trailing edge of the second vane, and the cut of the trailing edge is not allowed to exceed the critical amount that can change the position of the throat width, which can ensure the aerodynamic performance.

[0064] In a specific embodiment, the relationship between the throat area and the trailing edge cut is calculated by the following formula:

[0065] A = 0.02353 * L (A is the throat area change (in percentage), and L is the trailing edge cut length in mm).

[0066] In some embodiments of the present throat area adjustment method, in step S105, the second vane trailing edge arc portion before the cut of the trailing edge has a first diameter, and the second vane trailing edge arc portion after the cut of the trailing edge has a second diameter, wherein the second diameter is not greater than 1.5 times the first diameter. It has been verified that the throat area is still defined by the trailing edge of the first vane and the trailing edge of the second vane by the foregoing machining method.

[0067] In some embodiments of the present throat area adjustment method, in step S105, grinding machining is used to remove part of the trailing edge of the first vane and the second vane. In a specific embodiment, the cut of the trailing edge at the junction of the blade body and the rim plate can be appropriately reduced to form no obvious step.

[0068] In a specific embodiment, after the grinding machining is used to remove part of the trailing edge of the first vane and the second vane, polishing is performed to ensure that the small circle diameter of the trailing edge is as close to the design value as possible, and the blade surface has no obvious step and curvature mutation.

[0069] It has been verified that the effect of the cut of the trailing edge in step S105 on the turbine efficiency is less than 0.1%.

[0070] As shown in the polishing position diagram, in some embodiments of the present throat area adjustment method, in step S108, the back curvature of the first vane and the second vane is polished. Figure 11 As shown, the vane back before polishing is shown on the left, and the vane back after polishing is shown on the right. Figure 11

[0071] ​In some embodiments of the throat area adjustment method, in step S108, the arc length between 2mm upstream and 2mm downstream of the throat point of the trailing edge of the first guide vane and the second guide vane is polished. Specifically, the polishing of the trailing edge is performed by manual non-uniform polishing, and the coating is removed before polishing, and the curvature of the blade profile is ensured to have no obvious mutation during polishing. Polishing the trailing edge has a certain impact on the internal flow of the turbine, and the impact on the efficiency is less than 0.1%.

[0072] By the foregoing throat area adjustment method, the rim plate is first machined to change the angle, if the throat area does not meet the requirements, the tail rim is then cut, and if the throat area still does not meet the requirements, the trailing edge is finally polished. Since the rim plate machining has no effect on the blade shape, a larger range of throat area adjustment can be achieved, and the tail rim cutting can achieve a certain degree of throat area adjustment, although the blade shape is changed, but the change is small. Finally, the trailing edge polishing, which changes the blade configuration the most, is used to increase the throat area, so that the adjustment of the throat area can be realized under the condition that the effect on the blade shape is small.

[0073] On the other hand, according to some embodiments of the present application, a turbine guide vane manufacturing method is also provided, which comprises the following steps:

[0074] The guide vanes are installed into the guide vane, so that each guide vane forms a complete ring in the guide vane;

[0075] The throat area between adjacent guide vanes is measured to obtain a measured throat area value;

[0076] The measured throat area value is compared with the designed throat area value to obtain an initial error, if the initial error is greater than a threshold value, and the measured throat area value is less than the designed throat area value, the adjacent guide vanes are defined as a group of guide vanes to be corrected, and the throat area between the guide vanes to be corrected is adjusted by using the throat area adjustment method as described in one or more of the foregoing embodiments.

[0077] In another aspect, according to some embodiments of the present application, a turbine guide vane is also provided, which is manufactured by using the turbine guide vane manufacturing method as described in the foregoing embodiments.

[0078] In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method of adjusting a throat area, characterized by, The method comprises the following steps: a. obtaining a to-be-adjusted guide vane set, wherein the to-be-adjusted guide vane set comprises a first guide vane and a second guide vane, and a throat area is defined between a pressure surface of the first guide vane and a trailing edge of the second guide vane; b. machining a rim plate of the first guide vane and / or the second guide vane; c. measuring the throat area between the guide vanes in the to-be-adjusted guide vane set after assembly, and comparing the throat area with a design value of the throat area to obtain a first error value; d. determining whether the first error value is greater than a threshold value, if the first error value is less than the threshold value, the adjustment of the throat area of the guide vanes is completed, and if the first error value is greater than the threshold value, the step e is continued; e. cutting part of the trailing edge of the first guide vane and the second guide vane; f. measuring the throat area between the guide vanes in the to-be-adjusted guide vane set after assembly, and comparing the throat area with a design value of the throat area to obtain a second error value; g. determining whether the second error value is greater than a threshold value, if the second error value is less than the threshold value, the adjustment of the throat area of the guide vanes is completed, and if the second error value is greater than the threshold value, the step h is continued; h. polishing the pressure surface of the first guide vane and the second guide vane; i. measuring the throat area between the guide vanes in the to-be-adjusted guide vane set after assembly, and comparing the throat area with a design value of the throat area to obtain a third error value; j. determining whether the third error value is greater than a threshold value, if the third error value is less than the threshold value, the adjustment of the throat area of the guide vanes is completed, and if the third error value is greater than the threshold value, the steps h and i are repeated until the third error value is less than the threshold value.

2. The method of throat area adjustment as claimed in claim 1, wherein, In the step b, the rim plate of the first guide vane and / or the second guide vane is machined by changing the machining angle to change the throat area in the to-be-adjusted guide vane set after assembly.

3. The method of throat area adjustment as claimed in claim 1, wherein, In the step e, the throat area after cutting part of the trailing edge needs to satisfy that the throat area is still defined between the pressure surface of the first guide vane and the trailing edge of the second guide vane.

4. The method of throat area adjustment as claimed in claim 1 or 3, wherein, In the step e, the trailing edge arc part of the second guide vane before cutting part of the trailing edge has a first diameter, and the trailing edge arc part of the second guide vane after cutting part of the trailing edge has a second diameter; Wherein, the second diameter is not greater than 1.5 times of the first diameter.

5. The method of throat area adjustment as defined in claim 1, wherein, In the step e, the part of the trailing edge of the first guide vane and the second guide vane is removed by grinding machining.

6. The method of throat area adjustment as defined in claim 5, wherein, In the step e, after the part of the trailing edge of the first guide vane and the second guide vane is removed by grinding machining, the trailing edge of the first guide vane and the second guide vane is polished.

7. The method of throat area adjustment as defined in claim 1, wherein, In the step h, the greater curvature part of the pressure surface of the first guide vane and the second guide vane is polished.

8. The method of throat area adjustment as claimed in claim 1 or 7, wherein, In the step h, the arc length part between 2 mm upstream and 2 mm downstream of the throat point of the pressure surface of the first guide vane and the second guide vane is polished.

9. A method of manufacturing a turbine guide vane, characterized by, The method comprises the following steps: mounting the guide vanes into a guide vane carrier so that the guide vanes form a complete ring in the guide vane carrier; measuring the throat area between adjacent guide vanes to obtain a measured value of the throat area; Comparing the measured throat area value with the designed throat area value to obtain an initial error, if the initial error is greater than a threshold value and the measured throat area value is less than the designed throat area value, the adjacent guide vanes are defined as a guide vane group to be corrected, and a throat area adjustment method as claimed in any one of claims 1 to 8 is used to adjust the throat area between the guide vane group to be corrected.

10. A turbine guide characterized by, The turbine guide vane is manufactured by using the turbine guide vane manufacturing method as claimed in claim 9. The turbine guide vane is manufactured by using the turbine guide vane manufacturing method as claimed in claim 9.

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