A combustion chamber test device and its casing test piece

Abstract

An object of the present invention is to provide a combustion chamber test device and its casing test piece, which can improve the service life of each component in the combustion chamber test device under high-temperature environments. For the casing test piece to achieve the foregoing object, an annular cooling cavity is provided inside, and the annular cooling cavity includes a first cavity, a second cavity, and a partition plate. The first cavity has a first inlet and a first outlet, and the first inlet and the first outlet are respectively arranged on the outer peripheral side of the casing test piece and are staggeredly arranged in the axial direction of the casing test piece. The second cavity has a second inlet and a second outlet, the second inlet is arranged on the outer peripheral side of the casing test piece, and the second outlet is a plurality of small holes arranged on the inner peripheral side wall of the casing test piece. The first cavity and the second cavity are separated into two independent cavities by the partition plate, wherein the first cavity is closer to the combustion chamber outlet in the combustion chamber test device than the second cavity.

Description

Technical Field

[0001] The present invention relates to the field of aero-engine test and measurement, and particularly to a combustion chamber test device and a casing test piece thereof. Background Art

[0002] During the development process of an engine, full-ring combustion chamber tests need to be carried out to support the determination of component solutions during the critical technology research and component verification stages. Through the full-ring combustion chamber tests, key important performance indicators such as the total pressure loss, pollutant emissions, and outlet temperature distribution of the combustion chamber components are verified. The measurement of the above important indicators plays an important role in evaluating the performance of the full-ring combustion chamber test piece, guiding the optimization design of the combustion chamber components, and saving test resources.

[0003] The commonly used existing measurement method is to use a swing-type rear measurement section, that is, the rear measurement section drives the sampling sensing part to rotate around the central axis to traverse the entire measurement toroidal surface. The inventor found that since the full-ring combustion chamber test is a high-temperature and high-pressure test, both the main body of the combustion chamber test piece and the rear measurement section connected to the test section in the full-ring combustion chamber test need to withstand the erosion of high-temperature and high-pressure gas, facing a relatively severe cooling problem.

[0004] There is an urgent need to provide a new combustion chamber test device that can improve the service life of each component in the test device under high-temperature environments. Summary of the Invention

[0005] One object of the present invention is to provide a casing test piece that can improve the service life of each component in the combustion chamber test device under high-temperature environments.

[0006] Another object of the present invention is to provide a combustion chamber test device having the casing test piece as described above.

[0007] The casing test piece for achieving the foregoing object is used in a combustion chamber test device and has an annular cooling cavity inside. The annular cooling cavity includes:

[0008] A first cavity having a first inlet and a first outlet, the first inlet and the first outlet are respectively arranged on the outer peripheral side of the casing test piece and are staggeredly arranged in the axial direction of the casing test piece;

[0009] A second cavity having a second inlet and a second outlet, the second inlet is arranged on the outer peripheral side of the casing test piece, and the second outlet is a plurality of small holes arranged on the inner peripheral side wall of the casing test piece; and

[0010] A partition, the first cavity and the second cavity are separated into two independent cavities by the partition;

[0011] Among them, the first cavity is closer to the combustion chamber outlet in the combustion chamber test device than the second cavity.

[0012] In one or more embodiments, at least one annular rib is provided in the first cavity. The annular rib extends along the circumferential direction of the casing test piece and divides the first cavity into at least two annular flow channels. There is a flow channel opening between adjacent two annular flow channels.

[0013] Among them, the first inlet and the first outlet are respectively connected to different annular flow channels.

[0014] In one or more embodiments, a pair of guide plates is provided at the flow channel opening. After being guided by the guide plates, the cooling medium flows from one annular flow channel into the adjacent annular flow channel, and the flow direction of the cooling medium is opposite before and after being guided by the guide plates.

[0015] In one or more embodiments, the annular rib divides the first cavity into an odd number of annular flow channels.

[0016] The first inlet and the first outlet are respectively connected to the annular flow channels on the axial two sides of the casing test piece, and the first inlet and the first outlet are symmetrically arranged in the orthographic projection in the axial direction of the casing test piece.

[0017] Among them, the flow channel opening is divided by its circumferential position on the casing test piece into:

[0018] At least one first flow channel opening, having the same circumferential position as the first inlet;

[0019] At least one second flow channel opening, having the same circumferential position as the first outlet;

[0020] Between adjacent two first flow channel openings and / or between the first flow channel opening and the first inlet is separated by the annular rib, and between adjacent two second flow channel openings and / or between the second flow channel opening and the first outlet is separated by the annular rib.

[0021] In one or more embodiments, the casing test piece includes a test piece main body and flange connection edges arranged on both sides of the test piece main body.

[0022] Among them, the first inlet and the second inlet are respectively arranged on the flange connection edges.

[0023] In one or more embodiments, the casing test piece is formed by connecting a first inner ring piece, a second inner ring piece, a first outer ring piece, and a second outer ring piece. The annular convex rib is provided on the outer periphery of the first inner ring piece. One side of the second inner ring piece has the partition plate. The first outer ring piece and the second outer ring piece respectively have the flange connection edges;

[0024] Wherein, the second cavity has a second cavity side wall near the side of the casing test piece away from the combustion chamber outlet. The connection positions between the first inner ring piece, the second inner ring piece, the first outer ring piece, and the second outer ring piece are respectively separated from the second cavity side wall and the connection positions between the two flange connection edges and the test piece main body by a certain distance.

[0025] In one or more embodiments, the first cavity has a first cavity side wall near the side of the casing test piece close to the combustion chamber outlet. The first cavity side wall and the second cavity side wall are respectively arranged as arc-shaped grooves, so that in the axial section of the casing test piece, the first cavity side wall and the second cavity side wall are respectively rounded.

[0026] In one or more embodiments, the second outlet is a circle of small holes arranged along the inner circumference of the casing test piece.

[0027] In one or more embodiments, the small holes are inclined holes.

[0028] A combustion chamber test device for achieving the aforementioned another purpose includes a full-ring combustion chamber test piece main body and a rear measurement section, characterized in that the aforementioned casing test piece is provided in the full-ring combustion chamber test piece main body and the rear measurement section.

[0029] The progressive effects of the present invention include one or a combination of the following:

[0030] 1) By arranging a cooling casing between the full-ring combustion chamber test piece main body and the rear measurement section, it can play a connecting and transitional role in the middle, reduce the temperature and pressure of the high-temperature and high-pressure gas flow to the position of the rear measurement section, and improve the service life of the rear measurement section.

[0031] 2) There are two independently arranged cooling cavities inside the casing test piece for cooling. By reasonably arranging the flow paths, it is possible to effectively avoid the problem that the temperature of the cooling medium rises after passing through the front cavity, resulting in a reduction in the cooling effect on the rear cavity. At the same time, due to the design of the small spray holes on the rear cavity, if an integrated cooling cavity is used, it will also cause a reduction in the pressure of the front cavity and a slowdown in the water flow velocity, resulting in a reduction in the cooling effect on the front cavity. By using the first cavity and the second cavity arranged separately, it is possible to ensure that the cooling effects of the first cavity and the second cavity will not affect each other due to heat exchange with each other. While improving the cooling effect, it is possible to increase the service life of each component in the combustion chamber test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features, properties, and advantages of the present invention will become more apparent from the following description in conjunction with the drawings and embodiments, where:

[0033] Figure 1 shows a schematic diagram of a combustion chamber test device in one embodiment;

[0034] Figure 2 shows a three-dimensional schematic diagram of a casing test piece in one embodiment;

[0035] Figure 3 shows a cross-sectional schematic diagram of a casing test piece in one embodiment;

[0036] Figure 4 shows a three-dimensional schematic diagram of a first inner ring member from one perspective in one embodiment;

[0037] Figure 5 shows a three-dimensional schematic diagram of a first inner ring member from another perspective in one embodiment;

[0038] Figure 6 shows a three-dimensional schematic diagram of a second inner ring member 3 in one embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The following discloses various embodiments or examples for implementing the described subject technical solutions. To simplify the disclosure, specific examples of each element and arrangement are described below. Of course, these are only examples and do not limit the protection scope of the present application. Additionally, the same reference numerals and / or letters may be repeated in different examples in these disclosures. This repetition is for brevity and clarity and does not itself indicate the relationship between the various embodiments and / or structures to be discussed.

[0040] Meanwhile, specific terms are used in this application to describe the embodiments of this application. For example, "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined. Additionally, the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meanings and thus cannot be construed as limiting the protection scope of this application.

[0041] It should be noted that when used, the up, down, top, and bottom in the following descriptions are only used for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative positions and / or directions between various parts of the object.

[0042] It should be noted that these and subsequent other drawings are only examples and are not drawn under equal-proportion conditions, and should not be used to limit the actual protection scope required by this invention. In addition, the transformation methods under different embodiments can be appropriately combined.

[0043] In order to improve the service life of each component in the test device under high-temperature environments, a combustion chamber test device and its casing test piece are provided, as Figure 1 shows a schematic diagram of a combustion chamber test device in one embodiment.

[0044] Among them, the combustion chamber test device includes a full-ring combustion chamber test piece body not shown in the figure and a rear measurement section 91. Among them, a casing test piece 1 is provided between the full-ring combustion chamber test piece body and the rear measurement section 91, and the casing test piece 1 is arranged at the combustion chamber outlet 90.

[0045] The combustion chamber test device also includes a driving gear 92, a driven gear 93, and sampling measurement rakes 94 evenly distributed at two places. By rotating the driving gear 92 to drive the driven gear 93, the sampling measurement rakes 94 can rotate around the central axis to traverse the entire measurement toroidal surface of the full-ring combustion chamber outlet 90.

[0046] In order to reduce the temperature and pressure of the high-temperature and high-pressure gas flow at the position of the rear measurement section, thereby improving the service life of the rear measurement section in the combustion chamber test device, a casing test piece 1 is provided between the full-ring combustion chamber test piece body and the rear measurement section 91.

[0047] As Figure 2 shows a three-dimensional schematic diagram of the casing test piece in one embodiment.Figure 3 A cross-sectional schematic view of a casing test piece in an embodiment is shown.

[0048] The casing test piece 1 has an annular cooling cavity 10 inside. According to Figures 2 to 3 It can be understood that the casing test piece 1 is a rotating part structure, and an annular cavity is opened in this rotating part structure. Figure 3 The annular cooling cavity 10 shown in it is a schematic view of it in a cross-section.

[0049] The annular cooling cavity 10 has a first cavity 11, a second cavity 12 and a partition 13. The first cavity 11 has a first inlet 110 and a first outlet 111. The first inlet 110 and the first outlet 111 are respectively arranged on the outer peripheral side of the casing test piece 1. In the Figure 2 embodiment shown, the first inlet 110 and the first outlet 111 are respectively arranged in the form of pipe joints or nozzles. The first inlet 110 and the first outlet 111 are staggeredly arranged along the axial direction a of the casing test piece 1.

[0050] The second cavity 12 has a second inlet 120 and a second outlet 121. The second inlet 120 is arranged on the outer peripheral side of the casing test piece 1, and the second outlet 121 is a plurality of small holes arranged on the inner peripheral side wall of the casing test piece. In a specific embodiment, the plurality of small holes are small holes with a diameter between 2.4 mm and 2.6 mm.

[0051] The partition 13 is arranged between the first cavity 11 and the second cavity 12, separating the first cavity 11 and the second cavity 12 into two independent cavities. That is, the cooling medium in the first cavity 11 will only flow in from the first inlet 110 and flow out from the first outlet 111, and will not flow into the second cavity 12. The same is true for the cooling medium in the second cavity 12.

[0052] The first cavity 11 is closer to the combustion chamber outlet 90 in the combustion chamber test device than the second cavity 12. During the test, the cooling medium is introduced into the first cavity 11 and the second cavity 12 from the first inlet 110 and the second inlet 120 respectively. The cooling medium in the first cavity 11 flows circumferentially along the casing test piece 1 and then flows out from the first outlet 111, and cooling is achieved by exchanging heat with the wall surface of the first cavity 11 during the flow process. While the cooling medium in the second cavity 12 flows circumferentially along the casing test piece 1, it sprays out from the second outlet 121, that is, a plurality of small holes arranged on the inner circumferential side wall of the casing test piece. The water droplets sprayed out from the plurality of small holes can absorb heat and vaporize at the inner circumferential side wall of the casing test piece 1 to form a water vapor film. On the one hand, it can prevent the temperature at the inner circumferential side wall of the casing test piece 1 from being too high. On the other hand, the water vapor film with a lower temperature mixes with the main stream gas sprayed out from the full-ring combustion chamber test piece to reduce the temperature of the main stream gas, reduce the ablation of the rear measurement section 91, and improve the service life of the rear measurement section 91.

[0053] By separating the first cavity 11 and the second cavity 12 with a partition 13 into two independent cavities, compared with the integrated cooling cavity design, it can effectively avoid the problem that the cooling effect of the rear cavity is reduced due to the increase in the temperature of the cooling medium after passing through the front cavity. At the same time, due to the small spray hole design on the rear cavity, if an integrated cooling cavity is adopted, it will also cause the pressure in the front cavity to decrease and the water flow velocity to slow down, resulting in a reduction in the cooling effect of the front cavity. Using the separated first cavity 11 and second cavity 12 can ensure that the cooling effects of the first cavity 11 and the second cavity 12 will not affect each other due to heat exchange with each other. While improving the cooling effect, it can improve the service life of each component in the combustion chamber test device.

[0054] Although one embodiment of the combustion chamber test device and its casing test piece is as described above, in other embodiments of the combustion chamber test device and its casing test piece, the combustion chamber test device and its casing test piece can have more details in many aspects compared with the above embodiment, and at least a part of these details can have various changes. Some embodiments are used to illustrate at least a part of these details and changes below.

[0055] In one embodiment of the casing test piece, the casing test piece 1 includes a test piece main body 14 and flange connection edges 15 arranged on both sides of the test piece main body 14, such as a first flange connection edge 151 near the full-ring combustion chamber outlet 90 and a second flange connection edge 152 on the other side. Among them, the first inlet 110 is arranged on the first flange connection edge 151, the second inlet 120 is arranged on the second flange connection edge 152, and the casing test piece 1 is connected to the combustion chamber test piece through the first flange connection edge 151 and is connected to the rear measurement section 91 through the second flange connection edge 152.

[0056] In one embodiment of the casing test piece, the casing test piece 1 is formed by connecting a first inner ring member 2, a second inner ring member 3, a first outer ring member 4, and a second outer ring member 5. A partition 13 is provided on one side of the second inner ring member 3. The first outer ring member 4 has a first flange connecting edge 151, and the second outer ring member 5 has a second flange connecting edge 152.

[0057] Among them, the second cavity 12 has a second cavity side wall 122 near the side of the casing test piece 1 away from the combustion chamber outlet 90. The connection parts between the first inner ring member 2, the second inner ring member 3, the first outer ring member 4, and the second outer ring member 5 are respectively separated from the second cavity side wall 122, the connection part 14a between the first flange connecting edge 151 and the test piece main body 14, and the connection part 14b between the second flange connecting edge 152 and the test piece main body 14 by a certain distance. Specifically, there is a connection part 6a between the first outer ring member 4 and the first inner ring member 2, a connection part 6b between the first outer ring member 4 and the second outer ring member 5, and a connection part 6c between the second outer ring member 5 and the second inner ring member 3. The connection parts 6a, 6b, and 6c are respectively arranged at positions away from the second cavity side wall 122, the connection part 14a, and the connection part 14b. In a specific embodiment, the first inner ring member 2, the second inner ring member 3, the first outer ring member 4, and the second outer ring member 5 are connected by welding, such as argon arc welding, and the connection parts 6a, 6b, and 6c are weld seams.

[0058] Since the outer peripheral surface temperatures of the first flange connecting edge 151 and the second flange connecting edge 152 are relatively low, while the inner peripheral sides of the first inner ring member 2 and the second inner ring member 3 have relatively high temperatures due to direct contact with high-temperature gas, the temperature gradient of the two-layer structure is large, resulting in different structural expansion amounts, and there are incoordinated regions in the overall deformation, which easily form stress concentration, reduce the service life, and affect the economy of the design. It has been verified that the stress concentration positions include three positions: the second cavity side wall 122, the connection part 14a, and the connection part 14b. To improve the service life of the casing test piece 1, the weld seam positions are designed at positions away from the three high-stress areas, which can avoid the weld cracking problem caused by the reduction of the mechanical properties of the material after welding.

[0059] In a specific embodiment of the present casing test piece, all the materials of the present casing test piece are selected as superalloy materials to improve the high-temperature and high-pressure resistance of the present casing test piece.

[0060] Furthermore, in one embodiment of the casing test piece, the first cavity 11 has a first cavity side wall 112 near the side of the casing test piece 1 close to the combustion chamber outlet 90. The first cavity side wall 112 and the second cavity side wall 122 are respectively arranged as arc-shaped grooves so that Figure 3In the axial cross-section of the casing test piece shown in the figure, the side walls 112 of the first cavity and the side walls 122 of the second cavity are respectively rounded. This transitional rounded corner is beneficial to stiffness matching, thereby dispersing the high stress existing in the casing test piece.

[0061] Figure 4 The figure shows a three-dimensional schematic diagram of a first inner ring member from a certain perspective in an embodiment. Figure 5 The figure shows a three-dimensional schematic diagram of a first inner ring member from another perspective in an embodiment. Figure 4 And Figure 5 respectively show two sides of a first inner ring member in an embodiment. Please refer to Figures 3 to 5 , in an embodiment of the casing test piece, an annular rib 113 is provided in the first cavity 11. Among them, the annular rib 113 can be two as shown in the figure and arranged on the outer peripheral side of the first inner ring member 2. Of course, in some other suitable embodiments, the number of the annular ribs 113 can be appropriately changed, such as one or more than two. The following description is based on two annular ribs 113 arranged on the outer peripheral side of the first inner ring member 2 as shown in the figure.

[0062] The two annular ribs 113 respectively extend along the circumferential direction of the casing test piece to divide the first cavity into three annular flow channels 114, and there is a flow channel opening 115 between two adjacent annular flow channels 114. Among them, the first inlet 110 and the first outlet 111 are respectively connected to different annular flow channels 114. For example, Figures 4 to 5 schematically marks the positions of the first inlet 110 and the first outlet 111.

[0063] When the cooling medium is introduced into the first cavity 11 from the first inlet 110, it first flows along Figures 4 to 5 the arrow shown in the figure, flows in the annular flow channel 114 on the front side of the casing test piece, then enters the relatively rear annular flow channel 114 through the flow channel opening 115, and finally enters the last annular flow channel 114. After flowing, it flows out from the first outlet 111. By adopting the design of the annular rib 113, the distribution of the cooling water can be better controlled, and it can be ensured that the cooling medium can flow through most of the outer peripheral side walls of the first inner ring member 2 and perform heat exchange with the outer peripheral side walls, thereby improving the heat exchange effect.

[0064] Further, in an embodiment of the casing test piece, a pair of guide plates 116 are provided at the flow channel opening 115. After being guided by the guide plates 116, the cooling medium enters from an annular flow channel into an adjacent annular flow channel and flows therein. The flow direction of the cooling medium is opposite before and after being guided by the guide plates 116. Specifically, the guide plate 116 is a U-shaped guide plate structure as shown in the figure. When the cooling medium flows from the flow channel opening 115 to the annular flow channel 114 at the downstream position, it can be guided by the U-shaped guide plate, so that the flow direction is as shown by the arrow in the figure and makes a 180° turn. The water flow directions of two adjacent channels are opposite, so as to well ensure the water volume in each channel and thus ensure the cooling effect. At the same time, the design of the U-shaped guide plate makes the water flow smoother, reduces the flow loss, and avoids the occurrence of a flow dead zone, which may cause the temperature of the water-cooled inner sleeve here to be too high and result in ablation.

[0065] Further, in an embodiment of the casing test piece, the number of annular ridges 113 is an even number, so as to divide the first cavity 11 into an odd number of annular flow channels 114. The first inlet 110 and the first outlet 111 are respectively communicated with the annular flow channels 114 located on the axial two sides of the casing test piece, that is, the innermost and outermost annular flow channels 114 shown in the figure are communicated, and the first inlet 110 and the first outlet 111 are symmetrically arranged in the orthographic projection in the axial direction of the casing test piece 1. That is, when the first inlet 110 is at the uppermost circumferential position of the casing test piece 1, the first outlet 111 is at the lowermost circumferential position of the casing test piece 1.

[0066] Among them, the flow channel opening is divided into a first flow channel opening 115a and a second flow channel opening 115b according to its circumferential position on the casing test piece. In the embodiment shown in the figure, since the number of annular ridges 113 is two, the first cavity 11 is divided into three annular flow channels 114, so that the first flow channel opening 115a and the second flow channel opening 115b are respectively one. Of course, under other numbers of annular ridges 113, the annular flow channels 114 can be divided into multiple ones. Correspondingly, the numbers of the first flow channel opening 115a and the second flow channel opening 115b will also change, which will not be elaborated here.

[0067] Among them, the first flow channel opening 115a has the same circumferential position as the first inlet 110, that is, the connection line between one or more first flow channel openings 115a and the first inlet 110 is parallel to the axis of the casing test piece 1. The second flow channel opening 115b has the same circumferential position as the first outlet 111, that is, the connection line between one or more second flow channel openings 115b and the first outlet 111 is parallel to the axis of the casing test piece 1.

[0068] The adjacent first flow channel openings 115a and / or between the first flow channel opening 11a and the first inlet 110 are separated by the annular rib 113. At the same time, the adjacent second flow channel openings 115b and / or between the second flow channel opening 115b and the first outlet 111 are separated by the annular rib 113. Thus, when the cooling medium enters the first cavity 11 from the first inlet 110, in any annular flow channel 114, as shown by the arrows in the figure, two fluids with opposite flow directions will flow along the annular flow channel 114 for half a circle and then enter the annular flow channel 114 at the downstream position, so as to realize the flow from the front to the rear, around the upper and lower parts, and symmetrically left and right of the casing test piece, thereby further improving the cooling efficiency of the cooling medium.

[0069] Figure 6 Fig. shows a perspective schematic view of the second inner ring member 3 in an embodiment. In an embodiment of the casing test piece, the second outlet 121 is a circle of small holes arranged along the inner circumference of the casing test piece, so as to realize the uniform generation of steam film on the inner circumference of the casing test piece.

[0070] Further, in an embodiment of the casing test piece, the second outlet 121 in the shape of small holes corresponds to the area with higher temperature and stress concentration in the post-measurement section, such as the area marked 30 in the figure. The small holes are arranged more densely to better cool the post-measurement section.

[0071] Further, as Figure 3 shown, in an embodiment of the casing test piece, the small holes (the second outlet 121) are inclined holes. Specifically, the inclined holes are inclined from the inner circumference side to the outer circumference side of the casing test piece, along the side of the casing test piece close to the combustion chamber outlet 90 to the side far from the combustion chamber outlet 90, so as to more easily generate a steam film uniformly on the inner circumference of the casing test piece and further improve the cooling effect.

[0072] Although the present invention is disclosed above with preferred embodiments, it is not used to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and decoration made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A casing test piece for a combustion chamber test device, characterized in that It has an annular cooling cavity inside, and the annular cooling cavity includes: A first cavity with a first inlet and a first outlet, the first inlet and the first outlet are respectively arranged on the outer peripheral side of the casing test piece and are staggeredly arranged in the axial direction of the casing test piece; A second cavity with a second inlet and a second outlet, the second inlet is arranged on the outer peripheral side of the casing test piece, and the second outlet is a plurality of small holes arranged on the inner peripheral side wall of the casing test piece; and A partition, the first cavity and the second cavity are separated into two independent cavities by the partition; Wherein, the first cavity is closer to the combustion chamber outlet in the combustion chamber test device than the second cavity; At least one annular rib is arranged in the first cavity, the annular rib extends along the circumferential direction of the casing test piece, and at least two annular flow channels are separated in the first cavity, and there is a flow channel opening between two adjacent annular flow channels; Wherein, the first inlet and the first outlet are respectively communicated with different annular flow channels; The casing test piece includes a test piece main body and flange connection edges arranged on both sides of the test piece main body, wherein the first inlet and the second inlet are respectively arranged on the flange connection edges; The casing test piece is connected by a first inner ring part, a second inner ring part, a first outer ring part and a second outer ring part, the annular rib is arranged on the outer periphery of the first inner ring part, one side of the second inner ring part has the partition, and the first outer ring part and the second outer ring part respectively have the flange connection edges; Wherein, the second cavity has a second cavity side wall close to the side of the casing test piece away from the combustion chamber outlet, and the connection positions between the first inner ring part, the second inner ring part, the first outer ring part and the second outer ring part are respectively separated from the second cavity side wall, the connection positions between the two flange connection edges and the test piece main body by a certain distance.

2. The casing test piece according to claim 1, characterized in that A pair of guide plates is arranged at the flow channel opening, and the cooling medium flows from one annular flow channel into the adjacent annular flow channel after being guided by the guide plates, and the flow direction of the cooling medium is opposite before and after being guided by the guide plates.

3. The casing test piece according to claim 2, wherein, The annular rib divides the first cavity into an odd number of annular flow channels; The first inlet and the first outlet are respectively communicated with the annular flow channels located on both axial sides of the casing test piece, and the first inlet and the first outlet are symmetrically arranged in the orthographic projection in the axial direction of the casing test piece; Wherein, the flow channel opening is divided according to its circumferential position on the casing test piece into: At least one first flow channel opening having the same circumferential position as the first inlet; At least one second flow channel opening having the same circumferential position as the first outlet; The adjacent two first flow channel openings and / or between the first flow channel opening and the first inlet are separated by the annular rib, and the adjacent two second flow channel openings and / or between the second flow channel opening and the first outlet are separated by the annular rib.

4. The casing test piece according to claim 1, characterized in that, The first cavity has a first cavity side wall close to the side of the casing test piece near the combustion chamber outlet. The first cavity side wall and the second cavity side wall are respectively arranged as arc-shaped grooves, so that in the axial section of the casing test piece, the first cavity side wall and the second cavity side wall are respectively rounded.

5. The casing test piece according to claim 1, wherein The second outlet is a circle of small holes arranged along the inner circumference of the casing test piece.

6. The casing test piece according to claim 1, characterized in that The small holes are inclined holes.

7. A combustion chamber test device, comprising a full-ring combustion chamber test piece body and a rear measurement section, characterized in that, The casing test piece as described in any one of claims 1 to 6 is provided on the full-ring combustion chamber test piece body and the rear measurement section.

Images