Fan-shaped combustion chamber test piece unit and combustion chamber test system

Abstract

The invention aims to provide a fan-shaped combustion chamber test piece unit and a combustion chamber test system, the combustion chamber test system comprises an air inlet pipe and an exhaust pipe, the fan-shaped combustion chamber test piece unit comprises at least one fan-shaped flange surface, and a plurality of connecting holes are formed in the fan-shaped flange surface. Wherein the connecting hole is an arc-shaped hole, and the arc-shaped hole has an extending direction in the fan-shaped flange surface; the extending direction is an arc concentric with the circle center of the orthographic projection of the air inlet pipe flange connecting face on the section where the fan-shaped flange face is located and / or the circle center of the orthographic projection of the exhaust pipe flange connecting face on the section where the fan-shaped flange face is located. The test cost can be saved through the fan-shaped combustion chamber test piece unit.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature and high-pressure combustion chamber test piece design, and particularly relates to a sector combustion chamber test piece unit and a combustion chamber test system. Background Art

[0002] Aero-engine combustion chamber technology needs to carry out technical verification through single-head, multi-head to full-ring combustion chamber tests from paper design to application in core engine / overall engine test runs. Single-head combustion chamber tests are generally used for screening multiple combustion chamber schemes, screening out one or several schemes with better comprehensive performance from multiple schemes, and then continuing to carry out further test verifications in sector combustion chambers and even full-ring combustion chambers.

[0003] Combustion chamber test pieces generally carry out tests on combustion testers, and the test pieces are installed between the intake pipe and the exhaust pipe of the tester. In order to ensure the strength of the tester and meet its service life, the gas supply pipeline and the exhaust pipeline of the tester both adopt circular pipe structures. However, during the construction process of the tester, due to deviations such as factory building construction and trial production of supply / exhaust pipelines, or during the long-term use of the tester, when the structures of the supply / exhaust pipelines are deformed, there will be / occur circumferential angular offsets between the supply / exhaust pipelines. At this time, the installation structure of the test piece needs to be able to accommodate this angular offset. For the above-mentioned circumferential angular offset situation, there is no technical design difficulty for circular pipe-type single-head combustion chambers or full-ring combustion chambers, because circular pipe-type single-head combustion chambers and annular combustion chambers are axisymmetric structures and allow circumferential deflection. However, for single-sector combustion chambers or multi-head sector combustion chambers, there are situations where installation is difficult or impossible, because sector combustion chambers are face-symmetric rather than axisymmetric structures.

[0004] The conventional method is to add an adapter section structure (placed between the intake pipe and the test piece), and through on-site fitting and welding, the test piece and the tester can meet the circumferential angular offset situation. However, the problems brought by this method are that the trial production cost is increased, and in addition, the available space range for test piece design is occupied.

[0005] Therefore, there is an urgent need to provide a sector combustion chamber test piece that can save test costs. Summary of the Invention

[0006] The purpose of the present invention is to provide a sector combustion chamber test piece unit that can save test costs.

[0007] The sector combustion chamber test piece unit for achieving the foregoing purpose is used in a combustion chamber test system. The combustion chamber test system includes an intake pipe and an exhaust pipe. It is characterized in that it includes at least one sector flange surface, and a plurality of connection holes are provided in the sector flange surface;

[0008] Wherein, the connecting hole is an arc-shaped hole, and the arc-shaped hole has an extending direction in the sector flange surface, and the extending direction is an arc concentric with the center of the positive projection of the intake pipe flange connection surface in the cross-section where the sector flange surface is located and / or the center of the positive projection of the exhaust pipe flange connection surface in the cross-section where the sector flange surface is located.

[0009] In one or more embodiments, the sector flange surface is surrounded by an inner ring wall and an outer ring wall;

[0010] The inner ring wall includes an outer inner ring surface, an inner inner ring surface, and an inner ring connecting surface, and the inner ring connecting surface connects the outer inner ring surface and the inner inner ring surface on both sides of the inner ring wall;

[0011] The outer ring wall includes an outer outer ring surface, an inner outer ring surface, and an outer ring connecting surface, and the outer ring connecting surface connects the outer outer ring surface and the inner outer ring surface on both sides of the outer ring wall;

[0012] Wherein, in the cross-section where the sector flange surface is located, the arcs formed by the outer inner ring surface, the arcs formed by the inner inner ring surface, the arcs formed by the outer outer ring surface, and the arcs formed by the inner outer ring surface are concentrically arranged.

[0013] In one or more embodiments, in the cross-section where the sector flange surface is located, the arcs formed by the outer inner ring surface, the arcs formed by the inner inner ring surface, the arcs formed by the outer outer ring surface, the arcs formed by the inner outer ring surface, the center of the positive projection of the intake pipe flange connection surface, and the center of the positive projection of the exhaust pipe flange connection surface are concentrically arranged.

[0014] In one or more embodiments, in the cross-section where the sector flange surface is located, the arcs formed by the outer inner ring surface, the arcs formed by the inner inner ring surface, the arcs formed by the outer outer ring surface, and the arcs formed by the inner outer ring surface are eccentrically arranged with the center of the positive projection of the intake pipe flange connection surface and the center of the positive projection of the exhaust pipe flange connection surface.

[0015] On the other hand, according to some embodiments of the present application, a combustion chamber test system is further provided, which includes an intake pipe, a combustion chamber, and an exhaust pipe connected in sequence along the intake direction, and the combustion chamber is connected by the sector combustion chamber test piece unit according to any one of claims 1 to 4;

[0016] Wherein, the sector combustion chamber test piece units are connected through the sector flange surface.

[0017] In one or more embodiments, along the intake direction, the combustion chamber includes a front transition section, a front measurement section, a test section, a rear measurement section, and a rear transition section that are sequentially connected;

[0018] Wherein, on one side where the front transition section is connected to the front measurement section, there is provided the sector flange surface, and on the other side, it is configured as an annular flange surface; on one side where the rear transition section is connected to the rear measurement section, there is provided the sector flange surface, and on the other side, it is configured as an annular flange surface; both sides of the front measurement section, the test section, and the rear measurement section are configured as the sector flange surfaces.

[0019] In one or more embodiments, both ends of the arc-shaped hole are configured as arc segments, and there is a first included angle between the connecting lines of the centers of the two arc segments and the center of the circle where the extending direction of the arc-shaped hole is located;

[0020] Wherein, the first included angle satisfies the following formula (1):

[0021]

[0022] Wherein, θ i is the first included angle, N is the number of sector combustion chamber test piece units that make up the combustion chamber, and θ is the circumferential angle deviation between the intake pipe flange and the exhaust pipe flange.

[0023] In one or more embodiments, among the multiple sector combustion chamber test piece units that make up the combustion chamber, if the first included angle in each sector flange surface is equal, then there is:

[0024]

[0025] In one or more embodiments, the arc-shaped hole has a width, and the diameter of the arc segment is the same as the width of the arc-shaped hole.

[0026] In one or more embodiments, a flame tube assembly, a fuel nozzle, and an ignition plug are installed on the test section, an inlet test sensor is provided on the front measurement section, and an outlet test sensor is provided on the rear measurement section.

[0027] The beneficial effects of the present invention are as follows:

[0028] By setting up a sector-shaped combustion chamber test unit with the sector-shaped flange surface configuration, the sector-shaped combustion chamber test units connected by the sector-shaped flange surface can have the function of circumferential angle offset, so that the combustion chamber as a whole can adapt to the actual state of the tester with circumferential angle offset. At the same time, in the combustion chamber test system, the combustion chamber is composed of multiple sectors, and the sector-shaped flanges of each sector have the function of circumferential angle offset, so that the range of the overall circumferential angle offset of the combustion chamber can be expanded, so that the combustion chamber can adapt to the actual state of the tester with a large circumferential angle offset, so as to match the on-site situation of the circumferential angle offset of the inlet / exhaust pipe of the tester plant.

[0029] Through the sector combustion chamber test unit and the combustion chamber test system it consists of, there is no need to add an adapter section structure, which reduces the trial production and test costs and saves extra space for test piece design. At the same time, it improves the design process and system of high-temperature and high-pressure sector combustion chamber test pieces and solves the structural strength problem under the extreme incoordination of hot and cold.

[0030] The above description is only an overview of the technical solution of this application. In order to more clearly understand the technical means of this application, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of this application more obvious and easy to understand, the specific implementation methods of this application are listed below. Brief Description of the Figures

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0032] Figure 1 Shows a schematic diagram of some embodiments of the combustion chamber test system;

[0033] Figure 2 Shows a schematic diagram of the flange surface of the first flange;

[0034] Figure 3 Shows a schematic diagram of the circumferential offset between the first flange and the second flange;

[0035] Figure 4 Shows schematic diagrams of some embodiments of the sector-shaped flange surface;

[0036] Figure 5 For Figure 4 Partial enlarged schematic diagram of part A in the middle;

[0037] Figure 6 Shows schematic diagrams of other embodiments of the sector-shaped flange surface. Specific implementation method

[0038] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0040] In order to solve the problems brought by adding an adapter section structure in the prior art, on the one hand, according to some embodiments of the present application, a combustion chamber test system is provided. Figure 1 The figure shows a schematic diagram of some embodiments of the combustion chamber test system. The combustion chamber test system is sequentially connected along the intake direction x with an intake pipe 200, a combustion chamber 100, and an exhaust pipe 300. The combustion chamber 100 is formed by connecting a plurality of sector-shaped combustion chamber test piece units. Among them, the sector-shaped combustion chamber test piece units are connected by a sector-shaped flange surface 101.

[0041] Among them, the intake pipe 200 and the combustion chamber 100 are connected by a first flange 201, and the exhaust pipe 300 and the combustion chamber 100 are connected by a second flange 301. In order to ensure the strength of the tester and meet its service life, both the intake pipe 200 and the exhaust pipe 300 of the tester adopt a circular pipe structure. Therefore, the first flange 201 and the second flange 301 are circular flange structures.

[0042] Figure 2 The figure shows a schematic diagram of the flange surface of the first flange. The first flange 201 has a first inner ring wall 2010, a first outer ring wall 2011, and a first connection hole 2012. The first flange 201 and the butt joint component are fixedly connected through fasteners such as bolts in the first connection hole 2012. Under the test condition, the first inner ring wall 2010 is in contact with the oncoming flow (high-temperature and high-pressure) air of the tester, and the first outer ring wall 2011 is in contact with the ambient air in the tester workshop. With reference to the direction in the assembled state of the experimental system, the first flange 201 has a first connection hole 2012M located on a vertical plane.

[0043] Among them, the second flange 301 may have the same as the first flange 201 Figure 2Structures with the same configuration as shown. That is, the second flange 301 has a second inner ring wall 3010, a second outer ring wall 3011, and second connection holes 3012. The second flange 301 is fixedly connected to the butt - joint component through fasteners such as bolts in the second connection holes 3012. Under the test conditions, the second inner ring wall 3010 is in contact with the air flow (high - temperature and high - pressure) from the tester, and the second outer ring wall 3011 is in contact with the ambient air in the tester plant. Taking the direction in the assembled state of the experimental system as a reference, when there is no circumferential deflection angle between the intake pipe 200 and the exhaust pipe 300, the second connection holes 3012M located on the vertical plane also exist in the second flange 301. In some other suitable embodiments, the size specifications of the second flange 301 and the first flange 201 may not be the same.

[0044] However, during the construction of the tester, due to possible deviations in the trial - produced dimensions of the supply / exhaust pipes or large deviations in the installation dimensions in the plant, circumferential angular offsets may exist / occur between the intake / exhaust pipes. Or during the long - term use of the tester, the structures of the intake / exhaust pipes may undergo permanent deformation, and circumferential angular offsets may exist / occur between the intake / exhaust pipes. At this time, when there is a circumferential angular offset between the intake pipe 200 and the exhaust pipe 300, as Figure 3 shown, the flange - face configuration of the second flange 301 is shown by a solid line, while the flange - face configuration of the first flange 201 is shown by a dashed line. Figure 3 In the installation state as shown, assuming that the absolute angular position of the first flange 201 of the intake pipe 200 of the tester has not changed, during the construction of the tester or during the long - term use of the tester, the absolute angular position of the second flange 301 of the exhaust pipe 300 has changed. At this time, there is an angular offset θ between the first connection hole 2012M and the second connection hole 3012M.

[0045] When the situation as shown in Figure 3 occurs, in order to ensure that the combustion chamber 100 can still be installed on the intake pipe 200 and the exhaust pipe 300 of the tester, the usual method is to perform on - site fitting welding between the front flange of the front transition section of the combustion chamber 100 and the first flange 201. This treatment method has the following inherent defects: (1) After fitting welding, it can only be used for the current offset angle θ; (2) If the structural size of the intake pipe 200 is very large, the technical difficulty of on - site fitting welding of the front flange of the front transition section matching it is extremely high, and various problems such as incomplete penetration, severe shrinkage of the weld pool, and uneven welding are likely to occur. There is also another case, applicable to the situation where the structural size of the intake pipe 200 is small, that is, an adapter adjustment section is added between the intake pipe 200 and the combustion chamber 100 and on - site fitting welding is performed. This method has another defect: (3) It occupies the space position between the intake pipe 200 and the exhaust pipe 300, shortening the designable space of the combustion chamber.

[0046] To solve the above problems, on the other hand, according to some embodiments of the present application, a sector combustion chamber test piece unit is provided, which is used for the combustion chamber test system as described above. The sector combustion chamber test piece unit includes at least one sector flange surface 101, as Figure 4 shows a schematic diagram according to some embodiments of the present sector flange surface. Figure 5 is Figure 4 a partial enlarged schematic diagram of part A in. The sector flange surface 101 can be understood as the end face for connection in the sector flange. A plurality of connection holes 2 are provided in the sector flange surface 1. It can be understood that each connection hole is a through hole passing through the sector flange. Among them, as Figure 5 shown, the connection hole 2 is an arc-shaped hole. The arc-shaped hole 2 has an extension direction a in the sector flange surface 101. The extension direction a is an arc, and this arc has a center O. The flange connection surface of the intake pipe 200 (i.e., the end face of the first flange 201) has a center in the orthographic projection of the cross-section where the sector flange surface 101 is located. This center is the center O of the extension direction a, that is, the center of the circle where the extension direction a is located and the center of the end face of the first flange 201 are concentrically arranged in the orthographic projection of the cross-section where the sector flange surface 101 is located.

[0047] In another embodiment, the flange connection surface of the exhaust pipe 300 (i.e., the end face of the second flange 301) has a center in the orthographic projection of the cross-section where the sector flange surface 101 is located. This center is the center O of the extension direction a, that is, the center of the circle where the extension direction a is located and the center of the end face of the second flange 301 are concentrically arranged in the orthographic projection of the cross-section where the sector flange surface 101 is located.

[0048] In yet another embodiment, the center of the circle where the extension direction a is located and the centers of the end faces of the first flange 201 and the second flange 301 are concentrically arranged together in the orthographic projection of the cross-section where the sector flange surface 101 is located.

[0049] By providing the sector combustion chamber test unit with the above-described sector flange surface 101 configuration, the sector combustion chamber test units connected by fitting through the sector flange surface 101 have the function of circumferential angular offset with respect to each other, enabling the overall combustion chamber to adapt to the physical state of the tester with circumferential angular offset. At the same time, in the combustion chamber test system, the combustion chamber is composed of multiple fan segments, and the sector flanges of each fan segment all have the function of circumferential angular offset, enabling the overall circumferential angular offset range of the combustion chamber to be expanded, so that the combustion chamber can adapt to the physical state of the tester with a large circumferential angular offset amount to match the on-site situation where the inlet / outlet pipes of the tester plant have circumferential angular offset.

[0050] The sector combustion chamber test unit and the combustion chamber test system it consists of do not need to add an adapter section structure, which reduces the trial production and test costs and saves extra space for test piece design. At the same time, it improves the design process and system of high-temperature and high-pressure sector combustion chamber test pieces and solves the structural strength problem under the extreme incoordination of hot and cold.

[0051] In the description of the embodiments of this application, the technical terms "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0052] The reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0054] For some embodiments of the sector combustion chamber test piece unit, please continue to refer to Figure 4 , the fan-shaped flange surface 101 is surrounded by the inner ring wall 11 and the outer ring wall 12, wherein the inner ring wall 11 includes an inner ring outer profile 110, an inner ring inner profile 111 and an inner ring connecting profile 112, and the inner ring connecting profile 112 connects the inner ring outer profile 110 and the inner ring inner profile 111 on both sides of the inner ring wall 11. The outer ring wall 12 includes an outer ring outer profile 120, an outer ring inner profile 121 and an outer ring connecting profile 122, and the outer ring connecting profile 122 connects the outer ring outer profile 120 and the outer ring inner profile 121 on both sides of the outer ring wall 12. As Figure 4 As shown, in the cross section where the fan-shaped flange surface 101 is located, the arc formed by the inner ring outer profile 110, the arc formed by the inner ring inner profile 111, the arc formed by the outer ring outer profile 120 and the arc formed by the outer ring inner profile 121 are concentrically arranged, and the four have a common center O1 as shown in the figure. In the specific embodiment shown in the figure, the inner ring connection profile 112 and the outer ring connection profile 122 are also concentric semicircular arcs. In other specific embodiments, the inner ring wall 11 and the outer ring wall 12 are evenly spaced.

[0055] In some embodiments of the present sector combustion chamber test piece unit, please continue to refer to Figure 4 , in Figure 4 the illustrated embodiment, the sector flange surface 101 is an eccentric flange. At this time, in the cross-section of the sector flange surface 101 shown in Figure 4 , the center O1 of the arc formed by the inner ring outer profile 110, the arc formed by the inner ring inner profile 111, the arc formed by the outer ring outer profile 120, and the arc formed by the outer ring inner profile 121 is eccentrically arranged with the center O of the orthographic projection of the flange connection surface of the intake pipe 200 (i.e., the end surface of the first flange 201) and the center O of the orthographic projection of the flange connection surface of the exhaust pipe 300 (i.e., the end surface of the second flange 301).

[0056] In some embodiments of the present sector combustion chamber test piece unit, please refer to Figure 5 , in Figure 5 the illustrated embodiment, the sector flange surface 101 is a concentric flange. At this time, in the cross-section of the sector flange surface 101 shown in Figure 5 , the center O1 of the arc formed by the inner ring outer profile 110, the arc formed by the inner ring inner profile 111, the arc formed by the outer ring outer profile 120, and the arc formed by the outer ring inner profile 121 is concentrically arranged with the center O of the orthographic projection of the flange connection surface of the intake pipe 200 (i.e., the end surface of the first flange 201) and the center O of the orthographic projection of the flange connection surface of the exhaust pipe 300 (i.e., the end surface of the second flange 301).

[0057] Please refer to Figure 1 , in some embodiments of the present combustion chamber test system, along the intake direction x, the sector combustion chamber test piece unit constituting the combustion chamber 100 includes a front adapter section 31, a front measurement section 32, a test section 33, a rear measurement section 34, and a rear adapter section 35 connected in sequence. Among them, a sector flange surface 101 is provided on one side of the front adapter section 31 connected to the front measurement section 32, and a circular flange surface is configured on the other side; a sector flange surface 102 is provided on one side of the rear adapter section 35 connected to the rear measurement section 34, and a circular flange surface is configured on the other side; both sides of the front measurement section 32, the test section 33, and the rear measurement section 34 are configured as sector flange surfaces.

[0058] In some embodiments of the present combustion chamber test system, as shown in Figure 5 , both ends of the arc-shaped hole 2 are configured as arc segments 21, and there is a first included angle θ between the connection line of the centers 21a of the two arc segments 21 and the center of the circle where the extension direction a of the arc-shaped hole 2 is located. i ;

[0059] Among them, the first included angle satisfies the following formula (1):

[0060]

[0061] Among them, θ i is the first included angle, N is the number of sector combustion chamber test piece units that make up the combustion chamber, and θ is the circumferential angle deviation between the intake pipe flange (i.e., the first flange 201) and the exhaust pipe flange (i.e., the second flange 301).

[0062] In some embodiments of the present combustion chamber test system, among the multiple sector combustion chamber test piece units that make up the combustion chamber, the first included angles in each sector flange surface are equal, then there is:[[]]

[0063]

[0064] Through the above settings, it can be ensured that the sector combustion chamber test piece units can be successfully installed on the tester with a circumferential angle deviation between the intake / exhaust pipe flanges.[[]]

[0065] In some embodiments of the present combustion chamber test system, the arc-shaped hole 2 has a width, and the diameter of the arc segment 21 is the same as the width of the arc-shaped hole 2.[[]]

[0066] In some embodiments of the present combustion chamber test system, a flame tube assembly 331, a fuel nozzle 332, and an ignition plug 333 are installed on the test section 33, and an inlet test sensor 321 is provided on the front measurement section 32 for measuring the intake air temperature and pressure of the test section 33, etc. An outlet test sensor 341 is provided on the rear measurement section 34 for measuring the outlet temperature and gas components of the test section 33, etc.[[]]

[0067] In a specific embodiment, as Figure 5 shown, since the radius R values with respect to the center O at different arc-shaped holes 2 are different (i.e., R k ), therefore, the arc length values of each new runway-shaped bolt hole are all different (where i represents the i-th flange and k represents the k-th bolt hole on that flange).[[]]

[0068] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "vertical", "horizontal", "inner", "outer", "radial", "circumferential", etc. is the orientation or positional relationship based on the connection state of the connection components, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the present application.[[]]

[0069] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installation", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A sector-shaped combustion chamber test piece unit, used in a combustion chamber test system, wherein the combustion chamber test system comprises an intake pipe and an exhaust pipe, characterized in that: It comprises at least one sector-shaped flange surface, in which a plurality of connecting holes are arranged; Among them, the connecting hole is an arc-shaped hole, and the arc-shaped hole has an extension direction in the fan-shaped flange surface, and the extension direction is an arc concentric with the center of the circle of the positive projection of the intake pipe flange connecting surface on the section where the fan-shaped flange surface is located and / or the center of the circle of the positive projection of the exhaust pipe flange connecting surface on the section where the fan-shaped flange surface is located.

2. The sector combustion chamber test piece unit according to claim 1, characterized in that: The fan-shaped flange surface is surrounded by an inner annular wall and an outer annular wall; The inner ring wall comprises an inner ring outer profile, an inner ring inner profile and an inner ring connecting profile, wherein the inner ring connecting profile connects the inner ring outer profile and the inner ring inner profile on both sides of the inner ring wall; The outer ring wall comprises an outer ring outer profile, an outer ring inner profile and an outer ring connecting profile, wherein the outer ring connecting profile connects the outer ring outer profile and the outer ring inner profile on both sides of the outer ring wall; Among them, in the cross section where the fan-shaped flange surface is located, the arc formed by the outer surface of the inner ring, the arc formed by the inner surface of the inner ring, the arc formed by the outer surface of the outer ring and the arc formed by the inner surface of the outer ring are concentrically arranged.

3. The sector combustion chamber test piece unit according to claim 2, characterized in that: In the cross-section where the fan-shaped flange surface is located, the arc formed by the outer profile of the inner ring, the arc formed by the inner profile of the inner ring, the arc formed by the outer profile of the outer ring, the arc formed by the inner profile of the outer ring, the center of the circle where the orthographic projection of the intake pipe flange connecting surface is located, and the center of the circle where the orthographic projection of the exhaust pipe flange connecting surface is located are concentrically arranged.

4. The sector combustion chamber test piece unit according to claim 2, characterized in that: In the cross-section where the fan-shaped flange surface is located, the arc formed by the outer surface of the inner ring, the arc formed by the inner surface of the inner ring, the arc formed by the outer surface of the outer ring and the arc formed by the inner surface of the outer ring are eccentrically arranged with respect to the center of the orthographic projection of the intake pipe flange connecting surface and the center of the orthographic projection of the exhaust pipe flange connecting surface.

5. A combustion chamber test system, characterized in that: It comprises an intake pipe, a combustion chamber and an exhaust pipe which are sequentially connected along the intake direction, wherein the combustion chamber is formed by connecting the sector-shaped combustion chamber test piece units according to any one of claims 1 to 4; Wherein, the sector-shaped combustion chamber test piece units are connected via the sector-shaped flange surface.

6. The combustion chamber test system according to claim 5, characterized in that: Along the air intake direction, the combustion chamber includes a front transition section, a front measurement section, a test section, a rear measurement section and a rear transition section which are connected in sequence; Among them, the side where the front transition section is connected to the front measuring section is provided with the fan-shaped flange surface, and the other side is configured as an annular flange surface; the side where the rear transition section is connected to the rear measuring section is provided with the fan-shaped flange surface, and the other side is configured as an annular flange surface; both sides of the front measuring section, the test section and the rear measuring section are configured as the fan-shaped flange surfaces.

7. The combustion chamber test system according to claim 5, characterized in that: The two ends of the arc-shaped hole are configured as arc segments, and a first angle is formed between the center of the two arc segments and the center of the circle in which the arc-shaped hole extends; Wherein, the first angle satisfies the following formula (1): Among them, θ i is the first angle, N is the number of sector-shaped combustion chamber test piece units constituting the combustion chamber, and θ is the circumferential angle deviation between the intake pipe flange and the exhaust pipe flange.

8. The combustion chamber test system according to claim 7, characterized in that: In the plurality of the sector-shaped combustion chamber test piece units constituting the combustion chamber, the first angle in each of the sector-shaped flange surfaces is equal, and then:

9. The combustion chamber test system according to claim 7, characterized in that: The arc-shaped hole has a width, and the diameter of the arc segment is the same as the width of the arc-shaped hole.

10. The combustion chamber test system according to claim 6, characterized in that: The test section is equipped with a flame tube assembly, a fuel nozzle and an ignition nozzle, the front measuring section is provided with an inlet test sensing part, and the rear measuring section is provided with an outlet test sensing part.

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