Hole-opening diffuser with adjustable hole-opening area

Abstract

The utility model relates to a tapping diffuser with an adjustable tapping area, belongs to the technical field of engine performance test equipment, and solves the problem that a test bed suitable for a small-displacement engine in the prior art cannot test a large-displacement engine. The utility model provides a tapping diffuser with an adjustable tapping area. The tapping diffuser comprises a cylindrical main body and at least one annular plugging buckle, wherein the cylindrical main body is sequentially provided with a first closed area, a first trepanning area, a clamping area, a second trepanning area and a second closed area along the air inlet direction. According to the tapping diffuser, a proper number of annular plugging buckles can be assembled according to actual test requirements, so that different tapping proportions are obtained, and the tapping diffuser can be suitable for performance tests of engines with different displacements; and moreover, by reasonably adjusting the distribution of the trepanning areas, the temperature uniformity and safety of related equipment such as an exhaust tower can be further improved, and the purpose of testing engines with different thrust and air inlet flows on the same test bed is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine performance test equipment, especially to an open hole area adjustable open hole diffuser. BACKGROUND

[0002] The test bed is composed of an air intake tower, a test room, an injection cylinder (containing an open hole diffuser), an exhaust tower, an attached building and the like. The injection cylinder is a common exhaust collection device, and its main function is to capture the engine exhaust airflow and, through the injection effect of high-speed airflow, to suck the surrounding low-speed and low-temperature airflow, mix the high-temperature gas discharged by the engine with the low-temperature gas sucked in through the injection effect at the open hole diffuser, and then introduce the mixed gas into the exhaust tower for final discharge to the outside.

[0003] In the design of a test bed, the injection cylinder and the open hole diffuser need to be designed according to the performance parameters of the engine to be tested, so as to ensure that the average flow rate in the test room and the local maximum temperature of the exhaust tower meet the test and safety requirements during the engine test. Generally, different types and performance engines need to be tested on a specific test bed, in other words, the entire test bed is suitable for testing engines with thrust and intake flow rate within a certain range, and the open hole diffuser of the same test bed cannot be replaced.

[0004] For example, if a test of a large displacement engine is forcibly performed on a test bed suitable for a small displacement engine, the open hole area of the open hole diffuser is too large, resulting in insufficient gas resistance, which usually causes the average flow rate in the test room to exceed the range required for engine test, and seriously interferes with the engine thrust measurement. UTILITY MODEL CONTENTS

[0005] In view of the above analysis, the utility model aims to provide an open hole area adjustable open hole diffuser to solve the problem that the test bed suitable for a small displacement engine in the prior art cannot test a large displacement engine, and to achieve the purpose of testing engines with different thrust and intake flow rate on the same test bed.

[0006] The utility model mainly aims to realize the following technical scheme:

[0007] The utility model provides an open hole area adjustable open hole diffuser, which comprises a cylindrical main body and at least one annular sealing buckle 6.

[0008] The cylindrical main body comprises a first closed area 1, a first open hole area 2, a clamping area 3, a second open hole area 4 and a second closed area 5 in sequence along the air intake direction.

[0009] The first open hole area 2 and the second open hole area 4 are provided with exhaust holes, and the first closed area 1, the clamping area 3 and the second closed area 5 are not provided with exhaust holes.

[0010] The annular plugging buckle 6 is arranged at the position corresponding to the first open hole area 2 of the outer surface of the cylindrical body, and the inner diameter of the annular plugging buckle 6 matches the outer diameter of the cylindrical body.

[0011] Specifically, the sum of the widths of the annular plugging buckle 6 is the same as the total length of the first open hole area 2.

[0012] Specifically, the annular plugging buckle 6 is a single-piece buckle or a double-piece buckle.

[0013] Specifically, the inner side of the annular plugging buckle 6 is provided with an airtight gasket.

[0014] Specifically, the total area of the exhaust holes of the first open hole area 2 and the second open hole area 4 is 1.8-2.2 times the cross-sectional area of the cylindrical body, and the exhaust holes are uniformly distributed.

[0015] Specifically, the diameters of the exhaust holes of the first open hole area 2 and the second open hole area 4 are the same, and are 25-35 mm.

[0016] Specifically, the open hole rates of the first open hole area 2 and the second open hole area 4 are the same.

[0017] Specifically, the number of the annular plugging buckles 6 is 7-15.

[0018] Specifically, the annular plugging buckles (6) are arranged at intervals in the test state.

[0019] Specifically, the sum of the lengths of the first closed area 1, the clamping area 3 and the second closed area 5 is not less than 1 / 5 of the total length of the cylindrical body.

[0020] Compared with the prior art, the utility model can realize at least one of the following beneficial effects:

[0021] 1. The utility model discloses a detachable annular plugging buckle, so that the total open hole area of the open hole diffuser can be flexibly changed in the range of "the open hole area of the second open hole area-the sum of the open hole areas of the first and second open hole areas", so that the required open hole diffuser can meet the test needs of a wide range of exhaust engines.

[0022] 2. Further, when the number of annular plugging buckles is larger, the step of open hole area adjustment is more precise, and the distribution of open holes (here referring to exhaust holes that are not plugged) is more uniform, which is beneficial to the uniform distribution of the temperature of the exhaust tower and other related equipment, and improves the heat dissipation efficiency and safety performance.

[0023] It is worth mentioning that the number of annular sealing buckles cannot be increased unlimitedly, which will lead to complicated operation and increase the risk of deformation of the opening diffuser due to uneven fastening force of different buckles.

[0024] The various technical solutions described above can be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present application will be described in the following content, and some advantages will become apparent from the description or will be understood through the implementation of the present application. The purposes and other advantages of the present application can be achieved and obtained through the content specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings are only for the purpose of illustrating specific embodiments and are not considered as limiting the present application, and in the entire drawings, the same reference signs represent the same parts.

[0026] Figure 1 It is a structural schematic diagram of an opening area adjustable opening diffuser;

[0027] Figure 2 It is a schematic diagram of a cylindrical body structure;

[0028] Figure 3 It is a sealing scheme schematic diagram (15 annular sealing buckles) of an opening area adjustable opening diffuser.

[0029] Reference signs:

[0030] 1, first closed area; 2, first opening area; 3, clamping area; 4, second opening area; 5, second closed area; 6, annular sealing buckle. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present application will be specifically described below in combination with the drawings, wherein the drawings constitute a part of the present application and are used together with the embodiments of the present application to explain the principles of the present application, and are not used to limit the scope of the present application.

[0032] The present application provides an opening area adjustable opening diffuser, which comprises a cylindrical body and at least one annular sealing buckle;

[0033] The cylindrical body is sequentially provided with a first closed area, a first opening area, a clamping area, a second opening area and a second closed area along the air inlet direction;

[0034] The first opening area and the second opening area are provided with exhaust through holes, and the first closed area, the clamping area and the second closed area are not provided with exhaust through holes;

[0035] The annular sealing buckle is positioned at the corresponding location of the first opening area on the outer surface of the cylindrical body, and the inner diameter of the annular sealing buckle matches the outer diameter of the cylindrical body.

[0036] This invention, by setting a detachable annular sealing buckle, allows the total opening area of ​​the diffuser to be flexibly varied within the range of "the opening area of ​​the second opening area ~ the sum of the opening areas of the first and second opening areas", thereby enabling the required diffuser to meet the testing needs of engines with a wide range of displacements.

[0037] Specifically, the clamping part is used to connect with the clamping device to fix the ejector tube / aperture diffuser.

[0038] Specifically, the sum of the widths of the annular sealing buckles is the same as the total length of the first opening area. That is, when all the annular sealing buckles are installed, the first opening area is completely closed, and only the second opening area has an open exhaust hole.

[0039] Specifically, the annular sealing buckle is a single-piece buckle or a double-piece buckle.

[0040] Specifically, an airtight gasket is provided on the inner side of the annular sealing buckle to further improve the sealing effect and airtightness.

[0041] For example, during use, the airtight gasket is first installed in the pre-sealing position (if the airtight gasket is directly fixed to the inner surface of the buckle, the buckle can be installed directly), then the airtight gasket is initially tightened with a single-piece buckle or a double-piece buckle, and finally the buckle is locked by the locking device on the buckle, such as a metal screw or cable tie, to complete the sealing of the corresponding position / vent hole.

[0042] Specifically, the total area of ​​the exhaust vents in the first and second opening areas is 1.8 to 2.2 times the cross-sectional area of ​​the cylindrical body, and the exhaust vents are evenly distributed. An excessively large total area of ​​exhaust vents will result in insufficient structural strength of the cylindrical body, while an excessively small area will lead to poor exhaust performance.

[0043] Specifically, the diameters of the exhaust holes in the first and second opening areas are the same, both being 25-35mm, for example, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, and 35mm.

[0044] Specifically, the opening ratios of the first and second opening regions are the same.

[0045] Specifically, the number of the annular sealing buckles is 7 to 15, for example, 7, 8, 9, 10, 11, 12, 13, 14, or 15.

[0046] Furthermore, when there are more annular sealing buckles, the step size for adjusting the opening area is more precise, and the distribution of open through holes (referring to unsealed exhaust through holes) is more uniform, which is conducive to a more uniform temperature distribution of exhaust towers and other related equipment, thereby improving heat dissipation efficiency and safety performance.

[0047] It is worth noting that the number of annular sealing buckles cannot be increased indefinitely. On the one hand, this would lead to cumbersome operation, and on the other hand, it would increase the risk of deformation of the opening diffuser due to uneven tightening force of different buckles.

[0048] Specifically, the total number of the annular sealing buckles is 15. Under test conditions, the annular sealing buckles are spaced apart, that is, the number installed is 7 or 8, and the opening rate of the through hole in the first opening area is about 1 / 2.

[0049] For example, such as Figure 3 As shown, install the annular sealing clips corresponding to numbers 2, 4, 6, 8, 10, 12, and 14, for a total of 7 clips; or install the annular sealing clips corresponding to numbers 1, 3, 5, 7, 9, 11, 13, and 15, for a total of 8 clips.

[0050] Optionally, the number of annular sealing clips can be adjusted as needed. For example, when the opening rate of the through hole in the first opening area is about 1 / 3, such as... Figure 3 As shown, ten annular sealing clips (numbers 2, 3, 5, 6, 8, 9, 11, 12, 14, and 15) were installed, while annular sealing clips (numbers 1, 4, 7, 10, and 13) were not installed, leaving the corresponding exhaust orifices open. Numerical simulations were used to verify different sealing schemes. According to the calculations, before sealing, the average flow velocity in the test chamber exceeded 10 m / s, failing to meet the test requirements. After adopting the above sealing scheme (with the orifice opening rate in the first opening area approximately 1 / 3), the average flow velocity in the test chamber decreased to below 10 m / s, meeting the test requirements; furthermore, the local maximum temperature of the exhaust tower did not exceed 350℃, meeting safety requirements.

[0051] It is worth noting that, depending on actual needs, the opening diffuser can achieve sealing methods of 1 segment, 2 segments, ..., 15 segments, and when the number of sealing segments is the same, the sealing position can also be flexibly adjusted.

[0052] Specifically, the sum of the lengths of the first enclosed area, the clamping area, and the second enclosed area shall not be less than 1 / 5 of the total length of the cylindrical body, so as to avoid insufficient structural strength of the cylindrical body.

[0053] It is worth noting that since all the ring-shaped sealing clips are of the same model, even if some ring-shaped sealing clips are damaged during use, they can be temporarily replaced (except in the special case of complete sealing).

[0054] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An orifice area adjustable orifice diffuser characterized by, The open hole expander comprises a cylindrical body and at least one annular sealing buckle (6); The cylindrical body is sequentially provided with a first closed area (1), a first open hole area (2), a clamping area (3), a second open hole area (4) and a second closed area (5) in the air inlet direction; The first open hole area (2) and the second open hole area (4) are provided with exhaust through holes, and the first closed area (1), the clamping area (3) and the second closed area (5) are not provided with exhaust through holes; The annular sealing buckle (6) is arranged at the corresponding position of the first open hole area (2) on the outer surface of the cylindrical body, and the inner diameter of the annular sealing buckle (6) matches the outer diameter of the cylindrical body.

2. The perforated diffuser of claim 1, wherein, The sum of the widths of the annular sealing buckle (6) is the same as the total length of the first open hole area (2).

3. The perforated diffuser of claim 1, wherein, The annular sealing buckle (6) is a single-piece buckle or a double-piece buckle.

4. The perforated diffuser of claim 3, wherein, The inner side of the annular sealing buckle (6) is provided with an air-tight gasket.

5. The hole blocker in accordance with claim 1, wherein The total area of the exhaust through holes of the first open hole area (2) and the second open hole area (4) is 1.8-2.2 times the cross-sectional area of the cylindrical body, and the exhaust through holes are uniformly distributed.

6. The perforated diffuser of claim 5, wherein, The diameters of the exhaust through holes of the first open hole area (2) and the second open hole area (4) are the same, and are 25-35mm.

7. The hole blocker according to claim 5, wherein The open hole rates of the first open hole area (2) and the second open hole area (4) are the same.

8. The hole blocker according to claim 1, wherein The number of the annular sealing buckles (6) is 7-15.

9. The perforated diffuser of claim 8, wherein, The annular sealing buckles (6) are arranged at intervals in the test state.

10. The hole blocker in accordance with claim 1, characterized by The sum of the lengths of the first closed area (1), the clamping area (3) and the second closed area (5) is not less than 1 / 5 of the total length of the cylindrical body.

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